Abstract：The problems for calculational methods of active earth pressure of inclined excavation slope plane and the horizontal anchor spring coefficient of pile-anchor retaining and protection structure，and whether considering the friction between pile and soil or not on calculating active earth pressure are discussed，and these calculation formulas are deduced. The active earth pressure of inclined excavation slope plane can be directly calculated using the formula on the limit-equilibrium theory，no need first to calculate the Rankine¢s active earth pressure and then amend the result. The vertical displacement of pile-anchor retaining and protection structure generally does not occur to anchored bearing，so the axis extension of anchor is assumed equal to the horizontal extension of anchor，and it is rational to calculate the horizontal anchor spring coefficient on this assumption. The deduced formulas are compared with the formulas in code by calculation examples. Both engineering case and the calculating results of the examples show that the calculating active earth pressure using the formula in code is more than the calculating active earth pressure without considering the friction between pile and soil，and the calculating horizontal anchor spring coefficient using the formula in code is smaller than the calculating result using the formula for whether soil-nail wall or pile-anchor retaining and protection structure. Therefore，the retaining and protection structure of excavation should be properly optimized for the purpose of controlling engineering cost.
金亚兵，刘吉波. 基坑支护设计中的若干问题探讨 [J]. 岩石力学与工程学报, 2009, 28(S2): 3844-3849.
JIN Yabing，LIU Jibo. DISCUSSION ON SEVERAL PROBLEMS FOR RETAINING AND PROTECTION DESIGN OF EXCAVATION. , 2009, 28(S2): 3844-3849.
