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针对基坑工程中桩锚支护结构土压力计算的复杂性和准确性问题,采用室内模型试验的方法,得到非极限主动土压力的3个演化特征:即土压力与水平位移呈现一定的线性特征;开挖工况与土压力动态变化密切相关;桩锚支护结构的临界位移值较刚性挡墙要小.依据上述演化特征给出近似假定条件,借助线性内插方法构建出能够考虑开挖工况影响的非极限主动土压力计算公式.将同类计算方法概化为凸优化理论中的线性规划模型,提出一种预估非极限主动土压力的加权组合计算模式.通过工程实例验证,该计算模式较经典土压力理论的计算精度更高.
Aiming at the complexity and accuracy of earth pressure calculation for pile-anchor supporting structure in foundation pit engineering, three evolvement characteristics of non-limit active earth pressure are obtained by indoor model test: that is, the linear relationship between earth pressure and horizontal displacement appears linear The excavation condition is closely related to the dynamic change of earth pressure.The critical displacement of the pile-anchor supporting structure is smaller than that of the rigid retaining wall.According to the above-mentioned evolutionary characteristics, the approximate assumptions are given, and the linear interpolation method The calculation formula of the non-limit active earth pressure influenced by excavation conditions is generalized.The same calculation method is generalized as the linear programming model in the convex optimization theory, and a weighted combination prediction model for predicting the non-limit active earth pressure is proposed.Through the engineering example verification, The computational model is more accurate than classical theory of earth pressure.