高边坡桩锚支护结构中锚索拉力实测与分析

Monitoring and Analysis Stress in the Ground Anchor-Soldier Pile Supporting Structure in High Cut Slopes

为了解高边坡桩锚支护结构中预应力锚索的工作性能,对长沙市圭香路边坡进行了长期的原位监测。提出了锚索预应力损失的处理对策,分析了锚索拉力的动态变化规律以及水平位移随时间的变化规律,探讨了锚索拉力同水平位移的相关关系,得出预应力锚索对水平位移控制的关键性作用,指出水平位移还受到土体物理力学性质、桩的刚度、地下水等的影响,高边坡桩锚支护结构的设计计算,应体现坡体非均质、非线性变形特点。

The high cut slope at Guixiang Road,Changsha was long-term monitored in order to study the performance of the pre-stressed ground anchor and soldier pile under the operation conditions.Measures to deal with the pre-stress loss,pre-stress change and horizontal displacement change with time were investigated.The relationship between the pre-stress level and the horizontal displacement are also discussed in the paper.It is concluded that the pre-stress level controls the horizontal displacement.Other influence factors on the horizontal displacement are,soil properties,rigidity of the soldier pile,groundwater.It is also concluded that the nonlinear soil properties and the nonlinear deformation properties of the ground anchor should also be considered in the design of supporting high cut slope with ground anchor and soldier pile system.