深基坑预应力锚杆柔性支护设计参数的灵敏度分析

基于滑面应力分析的有限差分法建立了计算模型,对深基坑预应力锚杆柔性支护技术的设计参数进行了灵敏度分析。通过改变岩土体参数与锚杆参数,以基坑安全稳定系数与坑壁顶部的水平位移为判定标准,分析这些参数对基坑稳定与变形的影响,为预应力锚杆柔性支护技术设计参数的取值提供了一定的参考。分析结果表明,容重、内摩擦角、粘聚力以及锚杆预应力、锚杆倾角等设计参数的选择对基坑稳定与变形的设计计算至关重要。

Analysis on the sensitivity of design parameters for flexible retaining structure with prestressed anchor rods used in deep foundation pit

Based on the finite difference method with the slip surface stress analysis,the sensitivity of the design parameters for the foundation pit with prestressed anchor rods is analyzed.Through changing the pa-rameters of the rock,soil and the anchor rods,and taking the stability coefficient of the pit and the hori-zontal deformation of the pit top as the determination standard,the influence of the parameters to the sta-bility and the deformation are studied,which could provide the reference standard for the adoption values of the design parameters of the flexible retaining with the rods.The study results indicate that the determi-nation of the design parameters such as the gravity,internal friction angle and cohesive of soil mass,the prestress and the inclination angle of anchor rods is the key factor for the stability and deformation of foun-dation pit.