Mechanism of toppling and deformation in hard rock slope: a case of bank slope of Hydropower Station, Qinghai Province, China

Cai, Junchao; Ju, Nengpan; Huang, Runqiu; Zheng, Da; Zhao, Weihua; Li, Longqi; Jian, Huang

doi:10.1007/s11629-018-5096-x

Cited by 17 publications

(9 citation statements)

References 10 publications

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“…Eighteen sets were placed between fault F 6 and the rear edge slope of the concrete Figure 8: Comparison curve between the stress change of anchor stress meter and the excavation process. 9 Geofluids system at 850 m elevation, and eight sets were at the rear edge slope (Figure 5).…”

Section: Anchor Stress Monitoring Resultsmentioning

confidence: 99%

“…For example, the left and right abutment slopes of Miaowei Hydropower Station have undergone significant deformation during the excavation process. With the progress of the excavation, five significant deformations occurred on the left abutment slope, and a landslide occurred on the right abutment slope from 1340 m to 1384 m, severely affecting the construction [9,10]. Many scholars have analyzed the deformation mechanism of high steep slopes under excavation conditions.…”

Section: Introductionmentioning

confidence: 99%

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Stability Monitoring and Analysis of High and Steep Slope of a Hydropower Station

Shi

Hua

et al. 2020

Geofluids

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Slope deformation and failure are major challenges for hydropower station engineering. Taking the left bank slope at the exit of the flood discharge tunnel of the Wudongde Hydropower Station in China as an example, the deformation mechanism of the high-steep rock slope was studied. The height of the slope is about 200 m, which is affected by slope excavation, rainfall, and atomized rain. The results of multipoint displacement meters, surface deformation monitoring, and anchoring stress meters showed that the deformation and deformation rate of the slope have increased dramatically. Through the comprehensive analysis of the slope, it is found that the overall lithology of the slope is poor, the excavation disturbance causes the redistribution of the stress in the slope, and the excavation surface is relatively steep, which provides space for the deformation of the slope rock mass. Unloading relaxation leads to a large number of new fissures in the slope rock mass. These new fissures and fault fracture zones provide convenient conditions for rainfall and atomized rain infiltration. The rainwater infiltrated along the slope surface, formed the seepage field in the slope body, and weakened the rock-soil mass parameters. Meanwhile, saturated runoff is formed on the slope, causing large deformation of the slope rock mass. However, the migration of water in the slope has a time effect, and its influence on the stability of the slope also has a time effect. It is difficult for traditional monitoring methods to monitor the resulting changes in internal sliding force of the slope. Therefore, a remote monitoring and early warning system for landslide anchor cable force was introduced to monitor the slope stability changes caused by the impact of water flow and rainfall infiltration, which provided a reasonable and scientific reference for subsequent slope construction.

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Section: Anchor Stress Monitoring Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stability Monitoring and Analysis of High and Steep Slope of a Hydropower Station

Shi

Hua

et al. 2020

Geofluids

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“…Rock slope stability assessments are commonly performed by means of kinematical, analytical, and numerical analyses [7]. Since 1970, many rock mass classification systems that consider many affecting factors, such as the slope geometry, presence of water or water pressures, weathering effects, and excavation methods, have been proposed or modified and applied in the quantitative stability prediction of rock engineering [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis and Reliability Evaluation in Cataclastic Loose Rock Mass Blocks

Zhang

Wang

et al. 2021

Advances in Civil Engineering

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Cataclastic rock masses with multiple failure modes and mechanisms are critical geological problems in the construction of rock slopes. Cataclastic rock masses are widely distributed in slopes of a hydropower project located on Lancang River, which is located in Tibet, China. In this study, the potentially unstable block of the slope is divided into key block and secondary key block based on the key block theory, and the system reliability evaluation theory is introduced. The method for quantitatively analyzing the rock mass stability of cataclastic slopes with sliding failure is established. Then, the spatial distribution of cataclastic rock masses and discontinuities in several rock slopes of a hydropower project are determined using traditional geological surveying and 3D laser scanning. At last, combining the BATE 2.0 software and the stereographic projection of the vector, the proposed method is applied to the study area. The results show that the main failure mode of the studied slope is wedge failure, and the system reliability is 1.69. With the increase in the instability probability of the key block, the increase in the instability probability of the system block is obvious, which reflects the controlling effect of the key block on the stability of the system block. The calculated system instability probability is slightly larger than the key block instability probability.

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“…In the recent years, the researchers have found that the changes of the water level would affect the safety of the reservoir bank via numerical simulation [15,16] and/or field investigation [17,18]. e hydraulic conductivity and the rate of the water level changes dominate the transient flow response which directly controls the stability of the landslide [19,20].…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of the Shiliushubao Landslide Based on Deformation Characteristics and External Trigger Factors in the Three Gorges Reservoir

Luo

Ren

Bao

et al. 2021

Advances in Civil Engineering

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There exists the problem of landslide reactivation due to the seasonal fluctuation of rainfall and reservoir water level annually. Based on a large number of GPS monitoring data of the landslide mass after impoundment of the Three Gorges Reservoir in Shiliushubao landslide area, the relationship between the external trigger factors and slope stability could be obtained. A finite element calculation model has been established for the stability analysis of the Shiliushubao landslide after impoundment from January 2004 to October 2009. Through the deformation characteristics of the landslide, it is shown that the landslide exhibited a stepwise pattern on the whole, which developed faster after impoundment and slowed down in rainy seasons. The trend of the curve kept roughly opposite to the fluctuation of the safety factor. It suggested that the stability of the landslide mass was closely related to the seasonal fluctuation of the rainfall and the reservoir level, and the landslide deposits demonstrated to be reactive with them. The subject provides a certain reference value on the landslide stability analysis and the risk assessment within a similar engineering geological condition.

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Mechanism of toppling and deformation in hard rock slope: a case of bank slope of Hydropower Station, Qinghai Province, China

Cited by 17 publications

References 10 publications

Stability Monitoring and Analysis of High and Steep Slope of a Hydropower Station

Stability Monitoring and Analysis of High and Steep Slope of a Hydropower Station

Stability Analysis and Reliability Evaluation in Cataclastic Loose Rock Mass Blocks

Stability Analysis of the Shiliushubao Landslide Based on Deformation Characteristics and External Trigger Factors in the Three Gorges Reservoir

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