地震作用下抗滑桩间距计算与分析

基于太沙基松弛土压力理论，建立地震作用下桩间土拱效应受力分析模型，推导了考虑地震作用的抗滑桩间距计算公式。探讨了土拱有效影响范围和桩间土荷载分担比的合理取值，结果表明:土拱影响范围应为2.5倍的桩间净距，桩间土荷载分担比一般小于0.20。结合算例，不同地震烈度条件下桩间净距较不考虑地震时减小了8.1%~51.4%。敏感性分析显示，桩宽度、推力荷载大小和土性参数均会直接影响桩间净距计算值的大小，并且各变量对其影响程度在低烈度地震条件下更加明显。

Calculation and Analysis of Anti-slide Piles Spacing under Earthquake

By means of constructing the force analysis model of soil arching effect between piles under earthquake based on the theory of Terzaghi Relaxation pressure, the formula for anti-slide piles spacing considering the earthquake is derived. The rational value of suffering area of soil arching and soil load sharing ratio between piles is analyzed, it shows that the suffering area of soil arching should be 2.5 times of the clear distance between piles and the load sharing ratio is generally less than 0.20. The clear distance between piles under different earthquake intensities is reduced by 8.1%~51.4% compared with that did not consider the earthquake. The sensitivity analysis shows that the pile width, the thrust load and the soil parameters will directly affect the calculated value of the clear distance between piles, and the degree of influence of each variable on the pile spacing is more obvious in the low earthquake intensity.