Solidification of Heavy Metal Contaminant by the Use of Silicate-Coating Polymeric Nano-Capsules
Vahid Reza
Ouhadi
Faculty of Civil Engineering Bu-Ali Sina University
author
Parsa
Mohajeri
Faculty of Engineering, Bu-Ali Sina University
author
Mohammad
Amiri
Faculty of Engineering, Hormozgan University
author
text
article
2018
per
Solidification of heavy metal contaminants is known as one of the applicable methods for prevention of contaminant transport in soils. In recent years there have been some studies about the interaction of contaminant and nano-materials absorbent; however, it seems that there is a lack of research on interaction process of heavy metal contaminants and nano-capsules. Based on this, the present research attempts to develop the appropriate process for producing nano-capsules materials and investigate the capability of this material for contaminant retention.
Journal of Civil and Environmental Engineering
Dean of Faculty of Civil Engineering
2008-7918
48.3
v.
92
no.
2018
1
11
https://ceej.tabrizu.ac.ir/article_8234_cb96b67bfd744e98989a98468cf06a1e.pdf
dx.doi.org/10.22034/ceej.2018.8234
A Failure Criterion for Weak Cemented Soils
Ahad
Ouria
Civil Engineering Department, University of Mohaghegh Ardabili
author
Masood
Ranjbarnia
Civil Engineering Department, University of Tabriz
author
Darioush
Vaezipour
Civil Engineering Department, University of Tabriz
author
text
article
2018
per
Natural soils have inter-particular cemented bonds resulted from chemical reactions between soil particles that are called soil structure. The main distinctive aspect of the failure behavior of structured soils is the change of their behavior from a rock like brittle response to a soil like ductile response. Griffiths and Mohr-Coulomb failure criteria were used to describe the brittle and ductile failure behavior of structure soil superimposed using binary state functions. The state functions describe the phase transfer of structured soil from brittle to ductile response. The state functions derived based on the experimental data available in the literature for structured soils. The proposed failure criterion was verified by failure envelopes reported for naturally structured clay and shale, artificially cement treated gravel. Also, laboratory tests conducted on cement treated sand for further verifications. The results of the laboratory tests and verifications indicated that the proposed failure criterion is capable of describing the failure envelopes of natural structured clay and shale and artificially cemented gravel and sand.
Journal of Civil and Environmental Engineering
Dean of Faculty of Civil Engineering
2008-7918
48.3
v.
92
no.
2018
13
21
https://ceej.tabrizu.ac.ir/article_8235_9737693d3e8f6538be35c0e1659ec651.pdf
dx.doi.org/10.22034/ceej.2018.8235
Assessment of the Effect of Pre-stressing Steel Strut on Displacement of the Diaphragm Wall and the Soil
Mohammad
Bahrami
Faculty of Civil Engineering, Semnan University
author
Mohammad Iman
Khodakarami
Faculty of Civil Engineering, Semnan University
author
AbdolHossein
Haddad
Faculty of Civil Engineering, Semnan University
author
text
article
2018
per
In this research, the effects of pre-stressing steel struts on horizontal displacement of the diaphragm wall and settlement of the soil behind the wall are investigated utilizing the FLAC software through implementing the finite difference method and Mohr-Coulomb behavior model. A 20m diaphragm wall with 80 cm thickness and the Young's Modulus of 22000 MPa and the Poisson ratio of 0.15 is modeled. The final depth of excavation is 12 m and the properties corresponding to the concrete stiffness of the diaphragm wall, depth of excavation and arrangement of the struts are taken from (Freiseder and Schweiger, 1998). Modeling is done for 3 types of soils with different modulus of elasticity values including 3 pre-stressing forces and 3 different water levels, so totally 27 models were designed and analyzed. For this purpose 3 types of sandy soils with a Poisson ratio of 0.30 are used for modeling. The soils properties are taken from Chowdhury et al. (2013) and are given in Table 1. In this table 'φ denotes the internal friction angle and C 'denotes the soil's cohesion. This research is conducted for 3 water levels; at the ground level and for depths of 4 and 8 m below the ground level. The models are analyzed for three cases namely non-pre-stressing and pre-stressing forces of 200 and 400 KN.
Journal of Civil and Environmental Engineering
Dean of Faculty of Civil Engineering
2008-7918
48.3
v.
92
no.
2018
23
31
https://ceej.tabrizu.ac.ir/article_8236_e80969d5f8d5f21869599eeb2a034d9b.pdf
dx.doi.org/10.22034/ceej.2018.8236
Prediction of the Rock Brittleness Index Using Nonlinear Multivariable Regression and the CART Regression Tree
Masoud
Samaie
Department of Geotechnical Engineering , Faculty of Civil Engineering, University of Tabriz
author
Masoud
Ranjbarnia
Faculty of Civil Engineering, University of Tabriz
author
Masoud
Zare Naghadehi
Faculty of Mining Engineering, Hamedan University of Technology
author
text
article
2018
per
From 1960s several attempts have been made to measuring the rock brittleness index BI. Schwartz (1964) using results of a series of triaxial tests on rock samples, stated that the rock’s behavior from frangibility to ductility happens in 4.3 ratios of principal stresses. Altindag (2002; 2003) introduced a new method for prediction of the BI by the division of the uniaxial compressive strength (UCS) of the rock to Brazilian tensile strength (BTS). In the late 1960s punch penetration test (PPT) introduced by Handewith (1971) to measure some physical properties of rock sample related to hardness and toughness of rock. Yagiz (2006) stated that the PPT’s results for measuring the BI have a very high correlation with TBM penetration rate. Although the PPT has very delightful results, application of this test is very expensive and needs much time as well.Since 2002, researchers have made some efforts to predict the BI results acquired by PPT. Yagiz (2009) using 48 sets of 30 different tunnel rock’s PPT test data, introduced a new linear multivariable equation for prediction of the BI. In that equation, 3 major rock’s physical properties as UCS, BTS and unit weight were used. Also, Yagiz (2010) introduced a new nonlinear multivariable equation and improved the accuracy of prediction from R2=0.88 to R2=0.89. As well Khandewal et al (2016) developed a new equation using Genetic Programming (GP) based on Yagiz (2009) data with R2=0.90, but none of these equations include the type of rock as a major factor that influences the BI. In the present study, the BI will be investigated by considering the rock type (or texture) as an important parameter, and a new nonlinear multivariable equation will be introduced. As well using a classification and regression tree (CART) a new attempt will be made to predict the PPT’s result for the BI.
Journal of Civil and Environmental Engineering
Dean of Faculty of Civil Engineering
2008-7918
48.3
v.
92
no.
2018
33
40
https://ceej.tabrizu.ac.ir/article_8237_b4f91f20373a72151d29d04fff05e782.pdf
dx.doi.org/10.22034/ceej.2018.8237
Numerical Study of The Effect of Spur Dike’s Permeability on Erosion and Sedimentation Patterns in a 90° Mild Bend Using the CCHE2D Model
Parya
Fatahi
Campus of Agriculture and Natural Resources, Razi University, Kermsanshah
author
Ali
Arman
Campus of Agriculture and Natural Resources, Razi University, Kermsanshah
author
Javad
Zahiri
Assistant professor, Agricultural Sciences and Natural Resources University of Khuzestan
author
text
article
2018
per
Rivers are considered as one of the main sources of water and energy for human beings, and are considered as the aorta of human societies. Protecting the river bank against the erosion and degradation caused by the water flow, using various types of flow control structures is considered as a common method in river engineering science. One of the most important flow control structures is spur dikes that divert the flowing attack from the sides and critical areas and direct the flow towards the central axis of the river. Several researches have been conducted concerning the effect of spur dikes in protecting the river bank in bends such as: Barbhuiya and Dey (2004), Nasrollahi et al. (2008), Zhang et al. (2009). The purpose of the present study is to study the flow and sediment pattern in a 90-degree mild bend, with and without spur dikes with different permeability percentages.
Journal of Civil and Environmental Engineering
Dean of Faculty of Civil Engineering
2008-7918
48.3
v.
92
no.
2018
41
49
https://ceej.tabrizu.ac.ir/article_8238_ae89749007ac97959bd2d9ab1d7902a4.pdf
dx.doi.org/10.22034/ceej.2018.8238
Boundary Element Formulation for Computing Hydrodynamic Pressure on Concrete Gravity Dams: Influence of Reservoir Shape and Bottom Sediment Absorption
Farhoud
Kalateh
Faculty of Civil Engineering, University of Tabriz
author
text
article
2018
per
Dynamic response of dams interacting both with reservoir and foundation is a complex problem in time domain. To study the effects of reservoir and foundation on the response of dams under two-dimensional (2D) conditions, several numerical methods have been developed in the past few decades such as finite element method and the boundary element method. The boundary element method has been successfully applied to the dam dynamics (Humar and Jablonski (1988); Kucukarslan, (2004))
Journal of Civil and Environmental Engineering
Dean of Faculty of Civil Engineering
2008-7918
48.3
v.
92
no.
2018
51
59
https://ceej.tabrizu.ac.ir/article_8239_bf5bd64e02b609b530876f4c37f812f5.pdf
dx.doi.org/10.22034/ceej.2018.8239
Classification of Carbonated Soils from Geotechnical Point of View (Case study: Marly Soils of Tabriz)
Amirali
Mahouti
Aras international Campus, University of Tabriz
author
Hooshang
Katebi
Faculty of Civil Engineering, University of Tabriz
author
text
article
2018
per
With the corridor development of the Tabriz city in the east direction, a large part of urban development is located in a context of uneven topography and more on marl soils, either on the surface or in the depth.Review of scientific articles and geotechnical studies conducted at regional level indicate that in the description of Tabriz marls, no enough attention has been paid to recognize, describe and classify them; so that it is usually confined to mentioning the “marl” and describing its color. This study tries to specify some characteristics of various parameters of marls through conducting several tests in order to introduce the marl of Tabriz more and determine its position in the general definition of marl in the world; so that this study could be an introduction to a separate description and classification system that covers more distinct properties of this kind of soils and provides a more rigorous definition of it.Marl is a simple binary mixture of clay and calcium carbonate. However, because of the vast differences in type, and origin, there is no unified definition for marl. Large volumes of lacustrine carbonate sediment outcrops, locally known as Tabriz Marl, surrounds eastern and southern regions of Tabriz city in the Azerbaijan province of Iran. Tabriz Marl is generally known as a plastic and sticky, difficult to handle, and a very poor quality subgrade and embankment material. For these reasons, considerable volumes of cut soil, produced due to numerous developing projects of urban area and industrial zones, are inevitably dumped over valleys, low-lying areas, and also on hillsides. This trend causes man- made settling and sliding soil masses, which are causing considerable property losses and damage.
Journal of Civil and Environmental Engineering
Dean of Faculty of Civil Engineering
2008-7918
48.3
v.
92
no.
2018
61
73
https://ceej.tabrizu.ac.ir/article_8240_d3fc39fd3f8e24404b9a321085ba6aa4.pdf
dx.doi.org/10.22034/ceej.2018.8240
Flowfield Investigation around Straight and T-Shaped Spur Dikes Using Spectral Analysis and Stochastic Parameters
Mojtaba
Mehraein
Faculty of Engineering, Kharazmi University, Tehran
author
text
article
2018
per
Spur dikes are common river training structures. Spur dikes deviate approaching flow to the far bank. The scour formation around the spur dikes may be used to increase the habitants. Many researches such as Khosravi-Mashizi (2011) were done to find the effect of different effective parameters on scour hole dimensions around spur dikes. Previous researches showed that the scour hole dimensions decreases with spur dike submergence (Shariatzadeh, 2011). Previous researches on flow field around the spur dike may be categorized into two groups. The first group of researchers worked on mean flowfield and streamlines (Fazli, 2008). The researchers reported the formation of the upstream downflow and a horseshoe vortex around the spur dikes. The secondary flow has a main role in scour hole formation and the maximum strength of the secondary flow occurs near the upstream tip of the spur dike. In the second group of researches, the flowfield was investigated based on turbulent flow parameters (Dey and Barbhuiya, 2006). Researchers tried to investigate the relation between the scour and flow fields using turbulent parameters such as quadrant analysis, triple correlations and turbulent kinetic energy fluxes. The researchers showed that the ejection and sweep events have main role on sediment entrainment. According to the best knowledge of the authors, flow field investigation around the spur dike and the comparsion between the flow structures around the straight and T shaped spur dikes are in the preliminary stages. Hence, the authors tried to study and compare the flow structures around a straight and T shaped spur dike using spectral analysis, statistics parameters and conditional averaged velocity to find the effect of the turbulent parameters on scour process around the spur dikes.
Journal of Civil and Environmental Engineering
Dean of Faculty of Civil Engineering
2008-7918
48.3
v.
92
no.
2018
75
86
https://ceej.tabrizu.ac.ir/article_8241_14d83120d44dfc5d4011057f10b42f5e.pdf
dx.doi.org/10.22034/ceej.2018.8241
Investigation of Installation Consecutive Obstacles on the Characteristics and Controlling of Density Current Body
Seyed Zaniyar
Nikkhah
Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz
author
Seyed Mahmoud
Kashefipour
Faculty of Water Sciences and Engineering, University of Shahid Chamran
author
Mehdi
Daryaee
Assistant Professor, Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz
author
text
article
2018
per
Density current is the most important factor of sediment transport in the dam reservoirs. Density current is the current which is caused by density difference between two fluids on the acceleration of gravity. The effective acceleration of gravity acting on the flow, which is known as driving force for density flow is expressed as follows:
Journal of Civil and Environmental Engineering
Dean of Faculty of Civil Engineering
2008-7918
48.3
v.
92
no.
2018
87
95
https://ceej.tabrizu.ac.ir/article_8242_e1e659aafe79ad9cb71346d31957beba.pdf
dx.doi.org/10.22034/ceej.2018.8242
Effect of Drain Geometry on Dynamic Response of Homogeneous Earth Dams
Mahdiye
Darabi
Faculty of Civil Engineering, Bu-Ali Sina University
author
Mohamad
Maleki
Faculty of Civil Engineering, Bu-Ali Sina University, Hamedan
author
text
article
2018
per
The effect of material zones geometry in dam section has been studied sporadically by different authors. In this regard, the effects of vertical and inclined cores position on dynamic response of zoned earth dam were more studied. Lopez Querol et al. performed a set of numerical coupled analyses in order to determine the optimal location of impervious core in dam. The obtained results have been indicated that location of core is determined on the basis of some criteria such as minor liquefaction risk, minor soil degradation during the earthquake and minor crest settlement (Lopez-Querol., 2008). Karbor-e-Shyadeh and Soroush compared seismic response of Bidvaz dam (situated in Iran) with vertical and inclined cores. They claimed that, under earthquake loading, generated deformation in dam body comparatively larger for the dam with the inclined core, however, excess pore water pressures developed in the core are higher in the case of central dam (Karbor-e-Shayadeh., 2008). One of the important factors affecting the dynamic response of homogeneous earth dams is geometry and location of vertical or inclined drains inside of dam. This issue is fewer studied previously by researchers. In this study, the effect of drain geometry on dynamic response of homogeneous earth dam is evaluated.
Journal of Civil and Environmental Engineering
Dean of Faculty of Civil Engineering
2008-7918
48.3
v.
92
no.
2018
99
108
https://ceej.tabrizu.ac.ir/article_8243_3e42d26654f36489acdaf9f1ffe81da8.pdf
dx.doi.org/10.22034/ceej.2018.8243
Boushehr Liquefaction Hazard Zonation Based On SPT and Result Presentation by Using GIS Plat Form
Alireza
Hajiani Boushehrian
Faculty Member of Shiraz Islamic Azad University, Civil Engineering Departemnt
author
Mehrdad
Zare
Kermanshah Islamic Azad University. Civil Engineering Department.
author
text
article
2018
per
In the present paper, liquefaction hazard zonation of Boushehr city is presented. In this research program, geotechnical information of 151 borehole in Boushehr city have been gathered and utilized to zonation of liquefaction hazard specially in the inshore areas. Two different methods have been used to determine the liquefaction potential of these areas. Seed and Idriss (1971) and Iwasaki et al. (1982) are assessed the liquefaction potential of specific site by the aim of SPT results from site investigation. Results present by the aim of ArcGIS software. Different areas of city have been investigated in terms of liquefaction potential and ground water table. Results have been compared in the form of overlap method.
Journal of Civil and Environmental Engineering
Dean of Faculty of Civil Engineering
2008-7918
48.3
v.
92
no.
2018
109
119
https://ceej.tabrizu.ac.ir/article_8244_1c6221627ec5ac5cc61709019e3debe1.pdf
dx.doi.org/10.22034/ceej.2018.8244