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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.
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Received: 27 May 2013
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2014, Vol. 33 
