基于框架预应力锚杆加固技术的重力式挡土墙的稳定性分析

基于重力式挡土墙不稳定的现象,运用框架预应力锚杆加固技术对重力式挡土墙进行加固.以极限平衡理论及库仑土压力理论为基础,对挡土墙进行稳定性分析,推导出挡土墙的抗滑移稳定性和抗倾覆稳定性安全系数的求解计算公式.通过算例计算及对比分析,结果显示引入此加固技术的重力式挡墙的稳定性安全系数明显提高,在锚杆预应力每增加50kN时,稳定性安全系数提高的幅度达到50%左右;从经济性和安全性两方面综合考虑,对锚杆施加100kN的预应力是最佳的.

Stability analysis of gravity retaining wall reinforced with framed prestressed anchors

Based on the instability phenomenon of gravity retaining wall,the framed anchor with prestress was used to reinforce the retaining wall.On the basis of limit equilibrium theory and Coulomb earth pressure theory,the stability of retaining walls was analyzed and the solution formula of safety coefficient of stability of anti-slip and anti-overturning was derived.It was shown by illustrative computation and contrastive analysis,the result showed that the safety coefficient of stability of the gravity retaining wall with this kind of reinforcement techniques was significantly improved.The safety coefficient of stability would be increased by about 50% when the prestress was increased by 50 kN.However,taking the economic and security aspects into account,100 kN prestress applied to the anchors would be the most optimal.