scholarly journals ROCK SLOPE SURFACE STABILITY ANALYSIS: A CASE STUDY ON HON LON ISLAND, KIEN HAI DISTRICT, KIEN GIANG PROVINCE, VIETNAM

2021 ◽  
Vol 56 (5) ◽  
pp. 340-350
Author(s):  
Ngoc Binh Vu ◽  
Truong Thanh Phi ◽  
Thanh Cong Nguyen ◽  
Hong Thinh Phi ◽  
Quy Nhan Pham ◽  
...  
Keyword(s):  
Slope Failure ◽  
Rock Slope ◽  
Slope Surface ◽  
Plane Failure ◽  
Surface Stability ◽  
Average Percentage ◽  
The Road ◽  
Wedge Failure ◽  
Analytical Results

The research aimed to study 24 rock slope surfaces along the road around Hon Lon Island, Kien Hai district, Kien Giang province, Vietnam. The analytical results have determined slope failure, wedge failure, and toppling, which occurred on almost slope surface and the average percentage of plane failure is the largest. The average percent of plane failure is 19.23%, the wedge failure is 15.35%, and the toppling fault is 6.73%. Besides, the analytical results have also identified the slope surfaces which can be the key blocks: ND-13, 18, 23, 25, 34, 37, 45, 51, 62, 63. The other analytical results show that the existence of key blocks at the rock slope surfaces in the N-S direction, dip to E at the survey locations: ND-13, 23, 63 and dip to W at the survey locations: ND-37, 45; in the NE-SW direction, dip to SE at the survey locations: ND-15, 62 and dip to NW at the survey locations: ND-18, 34; in the NW-SE direction, dip to SW at the survey location ND-51. These results have important significance to support for protecting slope surface safety.

scholarly journals Analysis of Highway Slope Failure by Using Stereographic Projection Method

2019 ◽  
Vol 1 ◽  
pp. 45-54
Author(s):  
Bharat Prasad Bhandari ◽  
Tark Raj Joshi
Keyword(s):  
Projection Method ◽  
Slope Failure ◽  
Stereographic Projection ◽  
Plane Failure ◽  
The Road ◽  
Control Factors ◽  
Wedge Failure ◽  
Road Section ◽  
Hill Slope ◽  
The Hill

This study was conducted at the Bhasu Bhir of Kailali district in the Far-western Province, along the Khanidanda-Sahajpur road section of Bhimdatta pant highway. The main objective of this study is to identify the potential slope failure area and assess the major control factors along the road section. To accomplish the objective, the dip amount and dip direction of major discontinuity was measured in the field along with hill slope and hill slope direction. The data of 40 locations were analyzed by using stereographic projection method. The result was obtained by using Dips 6.0 software. The major slope failures obtained on the area were wedge failure and plane failure. The hill slope geometry, joint status and rock geometry are found major controlling factors for the slope failure in the study area.

Mechanism of Rock Slope Failure in Selected Quarries in Oyo State, Nigeria

2007 ◽  
Vol 18-19 ◽  
pp. 13-19
Author(s):  
J.M. Akande ◽  
M.A. Idris
Keyword(s):  
Slope Failure ◽  
Rock Slope ◽  
Failure Mechanisms ◽  
Slope Angle ◽  
Plane Failure ◽  
Bedding Planes ◽  
East Region ◽  
West Region ◽  
South West ◽  
South West Region

Rock slope failure mechanisms were assessed in this study using KOPEC and RCC quarries as case studies in Oyo state. Discontinuities such as joints and bedding planes were obtained through face mapping and scanline survey of the excavated slopes of the quarries. Stereographic projections of the discontinuities were generated using ROCKPACK III and the stereonets analyzed in accordance with Markland’s plane failure analysis. The results of the analyses show that there are possibilities of plane failures in the south- east region of KOPEC quarry slope face and south –west region of RCC quarry slope face. It is therefore recommended that constant monitoring of the slope failure should be done and the slope angle should be less than 700 and 600 for KOPEC quarry and RCC quarry respectively.

scholarly journals Reliability Analysis of Rock Slope Excavation Considering the Stochasticity and Finite Persistence of Wedges

2018 ◽  
Author(s):  
Guilin Wang ◽  
Fan Sun ◽  
Qiuyuan Tang
Keyword(s):  
Theoretical Basis ◽  
Slope Failure ◽  
Rock Slope ◽  
Binary Particle Swarm Optimization ◽  
Swarm Optimization ◽  
Wedge Failure ◽  
The Monte Carlo Method ◽  
Slope Excavation ◽  
Simplified Method ◽  
Excavation Stability

With a focus on wedge failure during rock slope excavation and considering stochasticity and finite persistence based on a stochastic structural-plane network simulation and Lajtai’s rock resistance criteria, we present a simplified method combined with binary particle swarm optimization (BPSO) to calculate the shear strength of 3D rock masses. The probabilities of rock slope failure under excavation surfaces of various sizes were obtained using the Monte Carlo method. These probabilities can provide a theoretical basis for determining excavation stability. The approach was applied to a rock slope excavation project in Chongqing, China, and yielded satisfactory results. 

scholarly journals STABILITY ANALYSIS AND FAILURE MECHANISMS OF OPEN PIT ROCK SLOPE

2017 ◽  
Vol 2 (3) ◽  
pp. 255
Author(s):  
Yahdi Azzuhry
Keyword(s):  
Rock Mass ◽  
Class Number ◽  
Kinematic Analysis ◽  
Slope Failure ◽  
Rock Slope ◽  
Failure Mechanisms ◽  
Slope Angle ◽  
Open Pit ◽  
Wedge Failure ◽  
Planar Failure

Rock mass in nature tend to be unideal, for it is heterogeneous, anisotropic and has discontinuity. The discontinuity makes anisotropic strength and stress in the rock mass, and also controls the changing of the elastic properties of rock mass. This condition results to disruptions in the rock mass strength balance, and finally drives the slopes to collapse. This study aims to determine the slope failure mechanisms in the area of case study, as well as its variations based on the Rock Mass Rating (RMR), Geological Strength Index (GSI), Slope Mass Rating (SMR), kinematic analysis, numerical analysis and monitoring approach slope movement in a coal mine slope applications. The site investigations were implemented to obtain information about slope collapse. Prior to the collapse, the slope inclination was 38° with of 94 meters height, strike slope of N 245 E and direction of slope surface of 335°. After the collapse, the slope was became 25º; and after the collapse materials were cleared, it was 35º. The discontinuity mapping obtained 5 sets of discontinuities, and the data were developed to obtain the value of RMR. The result of piezometer measurements was that at occurrence of collapse, slope elevation was 44.40m. Displacement value from monitoring SSMR showed that when the slope was collapsing in two stages, the first stage value was 70.61cm (a more critical condition, the value was rounded down to 70cm to the implementation in modelling) and the second stage value was at 124.25cm. The value of RMR89 in this study was greater than the value of GSI and SMR. As for the average value, it was obtained 34.67 for RMR89 value and 29.67 for GSI value, these rocks then can be classified into Poor Rock class number IV. The result of kinematic analysis found that sliding planar failure at dips 36°, and wedge failure at dips 36°, 35° and 34°. Acquisition SMR value obtained at 25, 27, 28 and 29. The SMR values classified the rock mass quality into class number IV, the description of the rock mass was relatively poor, the slope stability was low or unstable and the collapse manifold was planar or wedge failure. The result from the analysis of the model with its criteria obtained was that un-collapse conditions at angle 29°. It is recommended to use 29° angle to repair the slopes, and also recommended for overall high wall slope angle. Type of collapse that occurred on the slope failure mechanisms in all of the analysis that has been done, it is known that the mechanisms involved are complex types (combine of wedge failure, planar failure, and step-path failure) or classified into large scale rock slope failure surface.

scholarly journals Stability analysis of rock slope along selected road sections from Gutane Migiru town to Fincha sugar factory, Oromiya, Ethiopia

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Gadaawin Lamessa ◽  
Matebie Meten
Keyword(s):  
Slope Failure ◽  
Rock Slope ◽  
Limit Equilibrium ◽  
Input Parameter ◽  
Friction Angle ◽  
Point Load ◽  
Slope Instability ◽  
Sugar Factory ◽  
The Road ◽  
Limit Equilibrium Methods

AbstractThe slope instability was one of the common problems along the road that connects Gutane Migiru town to Fincha sugar factory, Western Ethiopia. The effect of the problem was intense mostly; during the rainy season, that triggers different modes of rock slope failure. As a result, the road was frequently damaged and blocked by the failed rock that in turn hinders the traffic activities. Thus, this study aimed at stability analyses of the critical slope sections using kinematic and limit equilibrium methods (LEM). The estimation of the most important input parameter in LEM analyses like cohesion and friction angle along the failure plane is often intricate and cumbersome. Hence, this paper used Rocscience software to effortlessly and instantly compute cohesion and friction angle along specific failure planes and then to carry out kinematic and LEM analyses. Besides, the strength of the intact rock was determined by the Schmidt hammer in the field and point load laboratory test. According to the kinematic analysis result, the wedge mode of rock slope failure occurred at slope sections D1S2 and D1S3 though the planar mode of failure occurred at slope sections D1S4 and D4S1. The factor of safety determined under all anticipated conditions became less than and greater than one at slope sections D1S2, D1S3, D1S4, and D4S1, and this depicts an unstable and stable slope, respectively. From the analysis result, the combined effect of rainfall, steepness of the slope dip, and joint set was the main factors that caused the slope insatiability.

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