Optimization of the ALPRIFT method using a support vector machine (SVM) to assess the subsidence Vulnerability of the southwestern plain of Tehran
Ali
Manafiazar
university of Tarbiat Modares. science faculty
author
Mashallah
khamechian
department of engineering geology. tarbiat modares university
author
Ataallah
Nadiri
department of geology. tabriz university
author
text
article
2018
per
Considering the increase in population and the development of agricultural activities in the south-western plain of Tehran, which has led to an increase in underground water drainage, the assessment of the vulnerability of subsidence areas is of great importance. In this research, the vulnerability of south-western plain of Tehran to subsidence has been investigated using ALPRIFT method in ArcGIS and optimization of the ALPRIFT method has been performed using SVM. To implement the ALPRIFT method, effective parameters have been used to assess the subsidence susceptibility including aquifer media, land use, groundwater pumping, recharge, aquifer thickness, faults distance and groundwater decline, which are ranked in seven separate layers and Weighted the ALPRIFT index from the combination of these seven layers, which was estimated to be 173-77. In order to optimize the ALPRIFT method, the SVM model was used. For this purpose, the input data (ALPRIFT parameters) and output (vulnerability index) and the subsidence amount were related to the two groups of training and testing. After training the model, Using the subsidence amount, the model results were evaluated at the experimental stage. The results showed that the SVM model was able to improve the results of the original ALPRIFT method. In order to verify the results, the InSAR radar map and its correlation coefficient (R^2) with the vulnerability index and correlation index (CI) of the piezometers in the plain were used.
Scientific Quarterly Journal of Iranian Association of Engineering Geology
Iranian Association of Engineering Geology
2228-5245
11
v.
2
no.
2018
1
14
https://www.jiraeg.ir/article_83263_7da6fe37bf8039a898669592fcafc3fc.pdf
Evaluation of Tunnel Seismic Prediction (TSP) Test Results based on Geological Observations and Analysis of the Parameters of the EPB Hard Rock Machine
vahid
joudaki
Department of Underground Structures, Sahel Omid Iranian Consultant Engineers Co.,
author
Abdollah
Sohrabi-bidar
Associate Professor, School of Geology, University of Tehran
author
Radoul
Ajalloeian
Professor,School of Geology, University of Isfahan
author
Navid
Amini
Assistant Professor, Institute of Geophysics, University of Tehran
author
Dickman
Thomas
PH.D., Department of Geophysics, Amberg Technologies Co.
author
text
article
2018
per
Bazideraz's water transfer tunnel is located in the Zagros structural zone. To excavation this tunnel, an EPB Hard Rock type TBM machine was used. The axis of the tunnel is located on an Anticline. In this anticline, there are various geological structures such as folding, fault, karst, and so on. The underlying studies of the design and implementation of exploratory specimens in the core of this anticline have been confined. In this research, for study of geological conditions during drilling, seismic prediction of tunnel (TSP) test was carried out at two positions of 287 + 3 and 577 + 5. In this geophysical method, seismic waves are used to illustrate geological structures. The distribution of shear waves in a three-dimensional tunnel model provides evidence of lithological changes (alternation of marl and shale and limestone layers) and the existence of several crushed zones along the drilling path. Bazideraz Tunnel is the first project in the world to use the TSP method to drill a EPB machine. In this study, the analysis of the operational parameters of the EPB machine and Observe rock mass during drilling was used to measure the accuracy of the TSP results. The fluctuations of the penetration rate, thrust and torque in the drilling path are in accordance with the low velocity and high velocity regions of the three-dimensional shear waves. Results of controlling the drilling materials indicate that the shear waves distribution models have a relative adaptation to the geological conditions in the drilling path.
Scientific Quarterly Journal of Iranian Association of Engineering Geology
Iranian Association of Engineering Geology
2228-5245
11
v.
2
no.
2018
15
31
https://www.jiraeg.ir/article_83487_d608590943090b13cb7c42ed1f0b7510.pdf
Experimental evaluation of stabilizad excavated wall using composite soil nailing and anchor
Zahra
Jalilzadeh
author
Masood
Haji Alilavi Bonab
author
Hooshang
Katebi
author
text
article
2018
per
Scientific Quarterly Journal of Iranian Association of Engineering Geology
Iranian Association of Engineering Geology
2228-5245
11
v.
2
no.
2018
33
44
https://www.jiraeg.ir/article_83490_017c8f7612da6f174e76a9b231352351.pdf
Flood zoning of Chalus basin using hydrologic model of HEC-RAS and Geographic Information System
Ali M.
Rajabi
University of Tehran
author
Taher
Rajaee
Civil Engineering Department, University of Qom
author
Ali
Fallah Tafti
Graduated from the Department of Civil Engineering, University of Qom
author
text
article
2018
per
In this study combination of GIS and HEC-RAS were used for flood zoning in the Chalus basin. For this purpose GIS data processing was done and the coordinate system was defined for the data and then the boundaries of the basin and sub-basin were determined with archydro. Using the extracted data TIN, DEM, mean slop and dip direction of rivers maps were produced and then using HEC-GEORAS, the data required for HEC-RAS software were prepared. Then the manning coefficient values, soil hydrologic groups and distribution maps of CN were extracted from land-use map and subsequently data transferred to the HEC-RAS and the values of manning in each of the cross sections were entered and boundary conditions were defined. Then HEC-RAS model was run in steady-state conditions. By overlaying different layers in GIS (such as the depth and velocity), dangerous areas during the flood were determined. Then the overlapping land-use map and velocity and depth layers, the land-use types at risk from flooding have been identified. Results presented that the floodplain area is equal to 8 and 24 percentage (Min. and Max). Most of the floodplain consists of rice land, building blocks, orchards, meadows and forests in the 2-year flood; therefore maximum damage happens for farmers and residences. By increasing the return period flood, the area of forest (that is placed within the floodplain) increases with higher ratio than building blocks, rice fields and pastures.
Scientific Quarterly Journal of Iranian Association of Engineering Geology
Iranian Association of Engineering Geology
2228-5245
11
v.
2
no.
2018
45
60
https://www.jiraeg.ir/article_84116_6788bfa080185b28a13f7b6e3c2ea5bb.pdf
Investigation of tensile strength and deformation characteristics of Varamin collapsible soils at undisturbed, reconstituted and treated states
Morteza
Hashemi
Department of Geology, University of Isfahan
author
Hossein
Mahmoudian
Department of Geology, University of Isfahan
author
Rasoul
Ajalloeian
Professor, Department of Engineering Geology, Isfahan University
author
text
article
2018
per
Tensile failures including tensile cracks on the upper part of instable slopes, earth fissures, tensile cracks in earth dams, and any kind of tensile failures resulted from tensile stresses within soil body are considered as important engineering geological features. Studying tensile strength and deformation characteristics of soils can have a great role in the prevention of adverse phenomena resulted from tensile failures in soils. The Varamin collapsible soils are subjected to tensile fractures and earth fissuring because of the tensile stresses raised from the land subsidence of the Varamin plain. Therefore, in this study, the strength and deformation characteristics of these soils were investigated at undisturbed, reconstituted and treated states. Results indicate that, when undisturbed collapsible soils are subjected to tensile stresses, they show a low tensile strength and behave brittle in tension. Reconstituted soils have a lower tensile strength in comparison with undisturbed soils and behave very soft and fail easily in tension. Treated soils have a higher tensile strength in comparison with undisturbed soils and behave more ductile in tension and tolerate more deformation before tensile failure. Results indicate that the treatment of the collapsible soils with stabilizer materials together with compaction is an efficient method for strengthening these soils against tensile stresses and for improving their performance in tension.
Scientific Quarterly Journal of Iranian Association of Engineering Geology
Iranian Association of Engineering Geology
2228-5245
11
v.
2
no.
2018
61
80
https://www.jiraeg.ir/article_84166_83b94a3b44597b0c70497e2e9b396e13.pdf
Investigation of the ability of ultrasonic parameters to evaluate the physical and mechanical characteristics and durability of carbonate rocks
Milad
Bashiri Goudarzi
Department of Gwology, University of Isfahan
author
Morteza
Hashemi
Department of Geology, University of Isfahan
author
-
-
-
author
text
article
2018
per
In this research by analyzing the signals of ultrasonic waves and obtaining the ultrasonic parameters in nine carbonate rocks from different parts of Iran, the ability of these parameters to assess the physical and mechanical properties and durability of rocks was investigated. For this purpose, firstly the petrographic, physical and mechanical properties of studied rocks were determined and then, in order to determine the durability of samples, long-term weathering tests of slake durability and wetting-drying up to 15 and 50 cycles were carried out, respectively. Moreover, a precise ultrasonic device capable to record wave signal was used and ultrasonic parameters of compressional wave velocity (VP), maximum amplitude (Amax), spatial attenuation (αs), and temporal attenuation (αs) were determined from recorded signals, before and after wetting-drying cycles. Results indicated that each of the ultrasonic parameters has different capabilities in rock characterization, such as VP can assess both physical and mechanical properties more accurate in comparison with other ultrasonic parameters. Results also indicated that Amax and αs detect the development of the microcracks resulted from wetting-drying cycles and the development of weathering within rocks more better than VP. On the other hand, αt is not sensitive to the weathering development in rock, while if this parameter is corrected and converted to αtc, it can detect the development of weathering within rocks.
Scientific Quarterly Journal of Iranian Association of Engineering Geology
Iranian Association of Engineering Geology
2228-5245
11
v.
2
no.
2018
81
98
https://www.jiraeg.ir/article_84279_e281c9d5e91efe88499df8c2fe49450f.pdf
Zonation of Rock-Slope Failure Potential of Sungun Copper Mine Based on SMR and Analytic Hierarchy Process (AHP)
Ghodrat
Barzegari
Department of Earth Sciences, Faculty of Natural Science, University of Tabriz, Iran
author
Mosa
Fathi
Department of Earth Sciences, Faculty of Natural Science, University of Tabriz, Iran
author
text
article
2018
per
Sungun copper mine is located in the East Azerbaijan province, 45 km north of Varzaqan County. In this research, in order to zonation of potentially unstable areas, slope mass rating (SMR), kinematical analysis and analytic hierarchy process (AHP) methods by using of Dips 6.0, Expert Choice and ArcGIS softwares were accomplished. In the study by using Analytical Hierarchy Process method, the effective general criterias on the failure of rock slopes and extraction benches including structural geology, geomechanics, groundwater condition of joints, morphology and degree of alteration were selected and ranked by forming a pairwise comparison matrix. Then the sub-criterias and alternatives are wheighted by using of overall row wheight method on the basis of their importance. Finally, by integration of obtained data layers in the ArcGIS system, the studied mine area was zoned in low, medium and higth category in terms of failure potentially. According to the results, the western, southern, southeast and scattered parts of the north area of the studied mine specially in mining benchs are more likely to rock slope failurs, which is in good agreement with field observations. The results showed that there is a fairly good agreement between the results of the methods used in this research. But due to the fact that in the hierarchical analysis method, other criteria involved in the failure are considered, and the result is more reliable.
Scientific Quarterly Journal of Iranian Association of Engineering Geology
Iranian Association of Engineering Geology
2228-5245
11
v.
2
no.
2018
99
113
https://www.jiraeg.ir/article_85011_6ab676d388cb95817e9844295553974e.pdf