CALCULATION METHOD FOR SLOPE REINFORCED BY GRILLAGE PRE-STRESSED ANCHOR BASED ON STABILITY OF
EXCAVATION PROCESS
LI Zhong1，2，CHEN Siyang1，ZHU Yanpeng1，2，GAO Jianxiang3
(1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province，Lanzhou University of Technology，Lanzhou，Gansu 730050，China；2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education，Lanzhou University of Technology，Lanzhou，Gansu 730050，China；3. Lanzhou Municipal Engineering Construction
Group Co.，Ltd.，Lanzhou，Gansu 730030，China)
摘要Considering the effect of the supporting structure and anchor on the slope stability in the excavation process，the stability calculation model is established for the slope reinforced by pre-stressed anchor and grillage beam，and the calculation model of the optimal solution of each anchor tension based on the stability of the whole process of excavation is presented. It realizes the real-time analysis and checking of slope stability in the process of excavation. The example calculation shows that：(1) The slope stability changes with the dynamic change of the design parameters of anchor and grillage beam. As a result，it is relatively more accurate and reasonable using dynamic search model to determine the critical slip surface of the slope reinforced by pre-stressed anchor and grillage beam. (2) By introducing the height influenced coefficient of anchor tension，the relation of each anchor layout and the slope height of different excavation stages are set up，and one group of optimal solution of anchor tension can be obtained，which can satisfy the stability requirements of the different excavation stages simultaneously. The results are consistent with the actual situation of project. It is further evidence that the method is reasonable and practical.
Abstract：Considering the effect of the supporting structure and anchor on the slope stability in the excavation process，the stability calculation model is established for the slope reinforced by pre-stressed anchor and grillage beam，and the calculation model of the optimal solution of each anchor tension based on the stability of the whole process of excavation is presented. It realizes the real-time analysis and checking of slope stability in the process of excavation. The example calculation shows that：(1) The slope stability changes with the dynamic change of the design parameters of anchor and grillage beam. As a result，it is relatively more accurate and reasonable using dynamic search model to determine the critical slip surface of the slope reinforced by pre-stressed anchor and grillage beam. (2) By introducing the height influenced coefficient of anchor tension，the relation of each anchor layout and the slope height of different excavation stages are set up，and one group of optimal solution of anchor tension can be obtained，which can satisfy the stability requirements of the different excavation stages simultaneously. The results are consistent with the actual situation of project. It is further evidence that the method is reasonable and practical.
陈祖煜. 土质边坡稳定分析——原理•方法•程序[M]. 北京：中国水利水电出版社，2005：197-215.(CHEN Zuyu. Rock slope stability analysis—theory，method and program[M]. Beijing：China Water Power Press，2005：197-215.(in Chinese))
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2014, Vol. 33 
