库水作用下路基边坡稳定性数值研究

近年来,我国低等级公路的里程量大幅度增加,而低等级公路的设计往往得不到足够的重视,特别是在河流发育的山区,公路设计存在一定的技术难度,必须同时考虑水的作用和路基的土方平衡。以库区路基边坡为例,利用数值模拟方法,分析了降水位条件下边坡的渗流场特征,并对不同工况下边坡稳定性进行了研究。结果表明,边坡地下水位随库水位的下降而降低,表现出明显的滞后效应。对于地形坡度较平缓的边坡,地表水体的作用更利于其自身稳定。工程设计宜重点考虑路基边坡防护设计,并辅以地表水截排措施。

Numerical Study on Stability of Roadbed Slope under Action of Reservoir Water

In recent years,the mileage of the low-grade highway has increased substantially in China.But the design of low-grade highway is often underappreciated,especially in the mountainous areas where rivers grow.There are certain technical difficulties in the highway design.It is necessary to simultaneously consider the action of water and the earthwork balance of roadbed.Taking the roadbed slope of reservoir are as an example,the numerical simulation method is used to analyze the seepage field characteristic of slope under the condition of rainfall level.The stability of slope under the different working conditions is studied.The result shows that the underground water level of slope reduces with the reduction of reservoir water level,and the hysteresis effect is showed obviously.For the gently topographic slope,the action of surface water body is beneficial to its own stability.The engineering design should focus on the protection design of roadbed slope,and be supplemented with the interception and drainage measures of surface water.