Analysis of the Influence of Excavation on Stability of High Lithological Bedding Slope and the Reinforcement Effect of Anchor Cable(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2018年第05期
- Page:
- 637-644
- Research Field:
- 工程地质
- Publishing date:
Info
- Title:
- Analysis of the Influence of Excavation on Stability of High Lithological Bedding Slope and the Reinforcement Effect of Anchor Cable
- Author(s):
- MA Shu-zhi; LIU Xiao-lang; XI Ren-shuang; WANG Zhe
- 1. Faculty of Engineering, China University of Geosciences, Wuhan 430074, Hubei, China; 2. Research Institute of Railway and Traffic Design, China Railway SIYUAN Survey and Design Group Co., Ltd, Wuhan 430063, Hubei, China
- Keywords:
- rock mass mechanics; lithological slope; stability; Sarma method; reinforcement; excavation unloading; anchor cable; expressway
- PACS:
- P642；U416.1+4
- DOI:
- -
- Abstract:
- The stability of high lithological bedding slope is usually poor, and it pays extra attention in the engineering practice, and anchor cable is an ideal reinforcement scheme. The Sarma method was applied to compare the stress characteristics and the slope stability coefficient of quartz schists in high lithological bedding slope of Xia-Sha expressway with and without anchor cable. The results show that the positive pressure of each slice bottom decreases with the excavation process without anchor cable, and the closer to the top of the slope, the greater the positive pressure of each slice is subjected to excavation unloading, and the more obvious the decreasing trend; the decrease of the positive pressure at the slice bottom decreases the sliding resistance force of the slope, and when the reduction is large, the slope stability will be significantly affected, and the stability coefficient of the slope decreases with a minimum of 1.243 during the whole excavation process; the positive pressure at the slice bottom increases with anchor cable, the sliding resistance force at the slice bottom can be improved, and the shear stress at the slice bottom also decreases, the sliding trend of the slice top can be limited, the extrusion and relative dislocation of the slice lower part are reduced, these above phenomena appear more obviously with the deepening of the excavation; furthermore, when the shear strength at the slice bottom is improved with anchor cable, the shear stresses of the slice bottom and side are reduced, and the sliding force of the slice is reduced, the purpose of slope reinforcement is achieved with the stability coefficient of 1.630. In conclusion, the slope excavation has great influence on the stability of the high lithological bedding slope, and the reinforcement with anchoring measures can significantly improve the stability of the slope and achieve the purpose of slope reinforcement.
Last Update: 2018-10-01