Safety monitoring and stability analysis of left abutment slope of Jinping I hydropower station

Song, Shengwu; Dewen, Cai; Feng, Xia‐Ting; Chen, Xiaopeng; Dikai, Wang

doi:10.3724/sp.j.1235.2011.00117

Cited by 17 publications

(8 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e strike of the stratum is the same as that of the river, and the left bank has a reverse dip slope [19][20][21][22]. In the region of the G1002 EPL, from 2100 to 2155 m in elevation, the bedrock consists of thin-layered Triassic (T 2-3z ) silty slate with bedding dipping into the slope (265°∠32°) and two sets of joints with 65°∠65°and 241°∠72° [ 19,23,24]. e outcrops are sporadically distributed on the slope surface and at the bottom of ditches.…”

Section: Stratum and Lithologymentioning

confidence: 99%

“…Previous feasibility research and analysis of the geological conditions of the research area showed that the possibility of geohazards is very small. However, the excavated volume of 5.933 × 10 6 m 3 including large underground caverns and the left dam abutment slope of 60 m height and 300 m width was huge [24,26,27], which can significantly affect the stress balance and produce stress redistribution [67,68]. As a result, many unloading fissures in the shallow rock layers were formed, and the rock joints were relaxed.…”

Section: Failure Mechanism Of the G1002 Electricity Pylonmentioning

confidence: 99%

See 1 more Smart Citation

Failure Mechanism and Mitigation Measures of the G1002 Electricity Pylon Landslide at the Jinping I Hydropower Station

Luo

Zhong

Yang

2020

Advances in Civil Engineering

View full text Add to dashboard Cite

On August 29 and 30, 2012, local extreme rainfalls struck the construction area of the Jinping I Hydropower Station, Xichang, China, and triggered many geohazards. The upper region of the left valley slope 200 m downstream of the dam failed and slid, exposing the D-pile of the G1002 electricity pylon and threatening the entire power transmission line. Therefore, guaranteeing the stability of the residual soil masses in the rear area of the main scarp and the safety of the G1002 electricity pylon became a primary emergency task. Geological field surveys, topographical mapping, study of the failure mechanisms, and stability evaluations were carried out from October 12, 2012, to November 7, 2013. It is revealed that the failure mechanism of the G1002 electricity pylon landslide is flood-induced tractive sliding along the interlayer between the colluvium and the bedrock, significantly influenced by heavy precipitation and frequent blasting activities during the dam construction. The residual soil masses around the G1002 electricity pylon foundation are unstable under rainfall conditions. In order to ensure the stability of the residual soil masses and pylon foundation, a mitigation measure of the anchor cables combined with lattice frame beams was proposed and applied in practice. This paper provides insights into the problems associated with the selection of the locations of electricity pylons in ravine regions as well as mitigation strategies for similar landslides.

show abstract

Section: Stratum and Lithologymentioning

confidence: 99%

Section: Failure Mechanism Of the G1002 Electricity Pylonmentioning

confidence: 99%

Failure Mechanism and Mitigation Measures of the G1002 Electricity Pylon Landslide at the Jinping I Hydropower Station

Luo

Zhong

Yang

2020

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…The arch dam is 305 m in height, the highest one under construction in the world. The total reservoir capacity is 7.76×10 9 m 3 at a normal water level of 1880 m and the annual regulating reservoir capacity is 4.91×10 9 m 3 [10].…”

Section: Engineering Backgroundmentioning

confidence: 99%

Prediction of Slope Stability Based on Ga-Bp Hybrid Algorithm

Xue¹,

Li²,

Yang³

et al. 2015

NNW

View full text Add to dashboard Cite

Safety monitoring and stability analysis of high slopes are important for high dam construction in mountainous regions or precipitous gorges. Slope stability estimation is an engineering problem that involves several parameters. To address these problems, a hybrid model based on the combination of Genetic algorithm (GA) and Back-propagation Artificial Neural Network (BP-ANN) is proposed in this study to improve the forecasting performance. GA was employed in selecting the best BP-ANN parameters to enhance the forecasting accuracy. Several important parameters, including the slope geological conditions, location of instruments, space and time conditions before and after measuring, were used as the input parameters, while the slope displacement was the output parameter. The results shown that the GA-BP model is a powerful computational tool that can be used to predict the slope stability.

show abstract

“…Therefore, advanced engineering measures should be implemented to prevent fault dislocations. With remarkable progress in material science, the emergence of high-performance techniques and ultrahigh-performance engineering materials has provided novel ideas for designing tunnel anti-fault methods such as anchor cables [38][39][40], anti-fault caverns [41][42][43], and rock mass grouting modifications [44][45][46]. Compared to improving the anti-fault measures of tunnel-supporting structures, these advanced engineering measures can change the maximum dislocation magnitude and bearing capacity of the rock mass.…”

Section: Introductionmentioning

confidence: 99%

Influence of advanced engineering measures on displacement and stress field of surrounding rock in tunnels crossing active strike-slip faults

Zhou,

Xiao,

et al. 2023

Front. Struct. Civ. Eng.

View full text Add to dashboard Cite

Based on significant improvements in engineering materials, three advanced engineering measures have been proposed—super anchor cables, high-strength concrete anti-fault caverns, and grouting modification using high-strength concrete-to resist fault dislocation in the surrounding rock near tunnels crossing active strike-slip faults. Moreover, single- or multiple-joint advanced engineering measures form the local rock mass-anti-fault (LRAF) method. A numerical method was used to investigate the influence of LRAF methods on the stress and displacement fields of the surrounding rock, and the anti-fault effect was evaluated. Finally, the mechanism of action of the anchor cable was verified using a three-dimensional numerical model. The numerical results indicated that the anchor cable and grouting modification reduced the displacement gradient of the local surrounding rock near the tunnels crossing fault. Furthermore, anchor cable and grouting modifications changed the stress field of the rock mass in the modified area. The tensile stress field of the rock mass in the modified anchor cable area was converted into a compressive stress field. The stress field in the modified grouting area changed from shear stress in the fault slip direction to tensile stress in the axial tunnel direction. The anti-fault cavern resisted the dislocation displacement and reduced the maximum dislocation magnitude, displacement gradient, and shear stress. Among the three advanced engineering measures, the anchor cable was the core of the three advanced engineering measures. An anchor cable, combined with other LRAF measures, can form an artificial safety island at the cross-fault position of the rock mass to protect the tunnel. The research results provide a new supporting idea for the surrounding rock of tunnels crossing active strike-slip faults.

show abstract

Safety monitoring and stability analysis of left abutment slope of Jinping I hydropower station

Cited by 17 publications

References 1 publication

Failure Mechanism and Mitigation Measures of the G1002 Electricity Pylon Landslide at the Jinping I Hydropower Station

Failure Mechanism and Mitigation Measures of the G1002 Electricity Pylon Landslide at the Jinping I Hydropower Station

Prediction of Slope Stability Based on Ga-Bp Hybrid Algorithm

Influence of advanced engineering measures on displacement and stress field of surrounding rock in tunnels crossing active strike-slip faults

Contact Info

Product

Resources

About