稳定渗流条件下沿河路基挡墙主动土压力分析

Analysis of active earth pressure on retaining wall of riverside subgrade under steady seepage

分析沿河路基挡墙在不同水力条件下的受力特征,有助于改进沿河路基支挡结构的设计和提高沿河路基的稳定性。对沿河路基挡墙的结构进行简化,将路基地下水的渗流状态简化为稳定渗流状态。就路基排水系统沿墙土界面布置、沿填土底面布置和路基排水系统完全失效3种情况,阐述了主动土压力的计算方法,并分析了路基排水系统的布置方式对作用于路基挡墙上的土压力的影响。得出结论:确保路基排水系统的有效性对提高沿河路基挡墙的稳定性至关重要;在路基排水系统有效的前提下,排水系统沿填土底面布置比沿墙土界面布置更有利于沿河路基挡墙的稳定。

Mechanical characteristics analysis of retaining wall of riverside subgrade under different hydraulic modes made a contribution to improvement of the supporting structure design and enhancement of the stability of riverside subgrade. Retaining wall structures of riverside subgrade is simplified and the seepage is as- sumed to be steady. The drainage modes of subgrade are classified to three types, i.e., the drainage system located between the retaining wall and filling, the drainage system located at the bottom of filling, and the drainage system is disabled. The calculation method of active earth pressure under three drainage modes stated above is given, and the influence of drainage mode on earth and water pressure is analyzed. The conclusion is as follows： the validity of subgrade drainage system is very important to the stability of retaining wall; comparing with retaining wall of riverside subgrade for its drainage system located between the retaining wall and filling, the retaining wall for its drainage system located at the bottom of filling is more stable.