考虑局部超载下的桩锚支护结构变形分析

深基坑桩锚支护结构中,关于局部荷载作用影响下的支护结构变形没有固定的分析方法.故引入非线性水平附加应力分布来考虑局部荷载附加作用,结合土体与桩共同变形的挠曲线方程,套用Excel内置函数导出支护桩的水平位移.通过实例的数值模拟结果与附加应力方法计算结果的对比分析,验证了考虑局部荷载下桩锚支护结构的变形计算方法的合理性.超载影响分析表明,相关因素主要影响区域为支护结构开挖面以上的范围,超载作用距离坑边距离的控制与超载值的取值大小对支护结构安全尤为重要.

Deformation analysis of pile-anchor supporting structureconsidering local overload

In the pile-anchor supporting structure in deep foundation pit, there is no fixed analysis method about the deformation of the supporting structure under the influence of local load. The non-linear horizontal additional stress distribution is introduced to consider the local load additional effect. Combined with the deflection curve equation of soil and pile common deformation, the Excel built-in function is applied to obtain the horizontal displacement of supporting pile. By comparing the numerical simulation results with the calculation results of the additional stress method, the rationality of the deformation calculation method of the pile anchor support structure considering the local load is verified. The analysis of the influencing factors of overload shows that the main influence area of relevant factors is the area above the excavation surface of the support structure. The control of the distance between the overload action and the pit edge and the value of the overload are particularly important for the safety of the supporting structure.