库水对既有高速公路桥区岸坡稳定性影响研究

以贵州省正安县猫溪沟水库工程库水对已建道安高速桥梁岸坡稳定性影响为研究对象,对岸坡基本特征、潜在滑动体、失稳模式进行分析,采用多种刚体极限平衡法进行各工况稳定性计算分析。结果表明:斜坡潜在滑动为强风化粉砂质泥岩及上部覆盖层滑动,不存在中风化基岩深层滑动可能;斜坡部分工况不满足安全控制标准,需对斜坡进行防护;水库调蓄过程中,稳定性系数变化较大,说明库水位变动是影响稳定性系数的关键因素。

Study on Influence of Reservoir Water on Stability of Bridge Bank Slope along Existing Highway

Herein how the water in Maoxigou Reservoir in Zheng’an County, Guizhou Province influences the stability of bridge bank slope along the built DAOAN Highway was taken as the object to analyze the basic characteristics of the slope, the potential sliding mass and the failure modes, and then by use of various rigid body limit equilibrium methods, the stability thereof in different working conditions was calculated. The result shows that the potential sliding of slope locates in strongly weathered silty mudstone and overburden layer without the possibility of deep sliding in moderately weathered bedrock; the slope with some conditions not meeting the safety control standard requires to be protected; in the course of reservoir regulation, the stability coefficient has relatively large variation, indicating the water level change therein is the key influencing factor.