库水动态对沿岸路基应力的影响

Influence of fluctuation of water level on stresses of roadbed along reservoir

基于室内物理模拟试验和FLAC数值模拟方法,对沿河(库)路基岩土体内部的孔隙水应力和总应力在河(库)水位动态变化条件下的变化特征进行了研究,两种模拟方法得出的结果是一致的。研究表明,水位上升阶段,总应力和孔隙水应力的总体变化趋势是增大的,但是总应力增大的幅度小,因而有效应力的总体变化趋势是减小的;水位下降阶段,总应力也略有减小,但由于孔隙水应力的大幅度减小,使得填土内有效应力总体上是增大变化的。同时,用FLAC数值模拟方法,能够很好地研究数据的规律性和掌握数据的连续性。因此,用FLAC有限差分法可以有效地模拟沿河(岸)路基在各种水力边界条件下应力场和渗流场的变化情况。

Based on an indoor physical simulation test and FLAC numerical simulation method,changing regulations of pore water stress and total stress of roadbed along reservoir or river are studied in the dynamic fluctuation of river or reservoir water level. And the results of the two methods are congruous. It's been proved that when water level rises,the whole changing trends of water stress and total stress are both increasing,but the increasing value of earth stress is smaller than that of water stress. So the effective stress is decreasing. When water level falls,total stress is decreasing,but water stress is decreasing greatly. So the effective stress was increasing. Meanwhile,the method of FLAC numerical simulation can better study the regulation of data and get the continuity of data. Therefore,FLAC finite difference method can be effectively used to simulate the changing conditions of stress field and seepage field of roadbed along reservoir or river under different hydraulic boundary conditions.