杭—甬天然气管道沿线某高边坡稳定性分析与加固方案评价

Stability Analysis and Reinforcement Scheme of a High Slope along Hang-Yong Natural Gas Pipeline

基于弹塑性有限元和极限平衡理论,研究并评价杭—甬天然气输气管道沿线某高边坡的稳定性,并分析结构面的强度和工作环境对边坡稳定的影响。研究表明:该边坡目前处于蠕滑状态,如遇强降水时将发生急剧滑动;边坡排水和注浆补强皆能改善坡体内应力状态,提高边坡的安全储备,特别是两种方法同时采用可使边坡安全系数达1.61;然而,要消除边坡后缘坡面的拉张破坏必须增加其它工程措施。研究结果为合理选择边坡加固方案和后续的安全监测提供了很好的依据。

Based on the elastoplastic finite element and the limit equilibrium theory, this paper discusses and evaluates the stability of a high slope along the Hang-Yong natural gas pipeline and analyses the influence of the strength of structural plane and the working conditions on the stability of slope. The results show that this slope is in creeping state at present and rapid slide may occur in case of heavy rainfall. Dewatering and grouting can both improve the stress state in the slope and enhance the safety margin of a high slope. Especially, if both methods are used in the same time, the safety coefficient of the slope can be 1.61; however, other engineering measures must be adopted to eliminate tensile damage to the trailing edge of the slope. The results provide good basis for choosing rational schemes for slope reinforcement and subsequent safety monitoring.