地震条件下抗滑桩时程分析计算法中动力地基系数研究

目前,在建筑物基础梁板、桩基础、抗滑桩的静力问题中广泛采用弹性地基梁法,地基梁法的地基系数可由试验方法、查表法等方法得到。但对于地震作用下的抗滑桩地基梁法,有关动力地基系数的研究尚存在不合理和不易确定的弱点。基于微分薄层法,通过对地震条件分层土压力的计算分析,提出了将动力条件的不同位移下的被动土压力和主动土压力与动力地基系数相联系的方法,与其他方法相比较,具有简单而又合理的特点,便于应用。

Study on Dynamic Foundation Coefficient in Time-history Analytical Calculations for Anti-sliding Piles under Seismic Condition

The method of elastic foundation beam is now widely used in the static problems arising out of structure＇s foundation beam and slab, pile foundation and anti-sliding piles, wherein the foundation coefficient may be defined by test method or table lookup ; however, for the foundation beam method for anti-sliding piles under the action of seism, the study on the dynamic foundation coefficient has some defects, such as irrationality and not easy to be defined. This paper, based on differential thin layered method, calculated and analyzed the soil pressure in layers under seismic condition, and proposed the method linking the active and passive soil pressure under different displacement, which are subject to dynamic condition, with the dynamic foundation coefficient. Compared with other methods, it is simple, reasonable and easy to be applied.