An ANN-RBF method to predict shear strength parameters of slope rock mass

In this study, using the collected data from 4 slope failures in one of the central mines of Iran, the shear strength parameters of jointed and crushed rock masses using back analysis method are calculated and its results are compared with the values obtained from the empirical methods. In this regard, firstly, the identification of failures is investigated and then geometrical and geological engineering parameters of slopes are collected and recorded by field survey. At this stage, using the Hoek-Brown criterion, shear strength parameters of the rock mass are estimated. Then, using appropriate software for slope stability analysis (limit equilibrium method software: SLIDE and numerical method software: FLAC), and assuming that safety factor is one, the shear strength parameters for sliding surfaces are determined. Finally, the results obtained from this analysis are compared with the results of the empirical methods and then suggestions are made to modify the input data of empirical method

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A Copula-Based Method for Estimating Shear Strength Parameters of Rock Mass

Mathematical Problems in Engineering ◽

10.1155/2014/693062 ◽

2014 ◽

Vol 2014 ◽

pp. 1-11 ◽

Cited By ~ 7

Author(s):

Da Huang ◽

Chao Yang ◽

Bin Zeng ◽

Guoyang Fu

Keyword(s):

Shear Strength ◽

Rock Mass ◽

Probabilistic Method ◽

Shear Strength Parameters ◽

Strength Parameters ◽

Copula Functions ◽

In Situ Tests ◽

Underground Caverns ◽

The Stability

The shear strength parameters (i.e., the internal friction coefficientfand cohesionc) are very important in rock engineering, especially for the stability analysis and reinforcement design of slopes and underground caverns. In this paper, a probabilistic method, Copula-based method, is proposed for estimating the shear strength parameters of rock mass. The optimal Copula functions between rock mass qualityQandf,Qandcfor the marbles are established based on the correlation analyses of the results of 12 sets of in situ tests in the exploration adits of Jinping I-Stage Hydropower Station. Although the Copula functions are derived from the in situ tests for the marbles, they can be extended to be applied to other types of rock mass with similar geological and mechanical properties. For another 9 sets of in situ tests as an extensional application, by comparison with the results from Hoek-Brown criterion, the estimated values offandcfrom the Copula-based method achieve better accuracy. Therefore, the proposed Copula-based method is an effective tool in estimating rock strength parameters.

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A Note on Partial Safety Factors for In-situ Shear Strength Parameters of Rock-Mass

Lecture Notes in Civil Engineering - Proceedings of the 1st Indo-China Research Series in Geotechnical and Geoenvironmental Engineering ◽

10.1007/978-981-33-4324-5_9 ◽

2021 ◽

pp. 129-138

Author(s):

Shashank Pathak ◽

G. V. Ramana

Keyword(s):

Shear Strength ◽

Rock Mass ◽

Shear Strength Parameters ◽

Safety Factors ◽

Strength Parameters ◽

Partial Safety Factors

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Back Analysis about Shear Strength and Deformation Parameters of High Excavated Accumulation Slope in Xiaowan Hydropower Station

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.255-260.3482 ◽

2011 ◽

Vol 255-260 ◽

pp. 3482-3487 ◽

Cited By ~ 1

Author(s):

Le Hua Wang ◽

Jian Lin Li ◽

Shan Shan Yang ◽

Zhuang Cheng ◽

Min Zhu

Keyword(s):

Shear Strength ◽

Rock Mass ◽

Limit Equilibrium ◽

Strain Analysis ◽

Hydropower Station ◽

Shear Strength Parameters ◽

Strength Parameters ◽

Stability Calculation ◽

Deformation Parameters ◽

Accumulation Slope

Proper mechanical parameters of slope rock mass are the premise which ensures the smooth progress of slope stability calculation. By analyzing the geological information of the yinshuigou accumulation slope on ridge 2 in Xiaowan hydropower station, and according to the deformation and damage in the excavation of the accumulation slope, this paper inverts the shear strength parameters of the accumulation slope by using 2D rigid limit equilibrium method. On base of unloading rock mass mechanics methods, the stress and strain analysis to the accumulation slope is studied by using 3D finite difference method, and by contrast of the monitoring displacement and calculated displacement in slope-direction about the key point of the accumulation slope , the article inverts the deformation parameters of the accumulation slope. Finally, the shear strength parameters in the contact zone are ascertained as: C=0.04MPa, Φ=30°, and the deformation parameter of the accumulation slope is changed from the initial 1.5MPa to 0.95MPa by the damage unloading.

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