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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。
In order to understand the working performance of prestressed anchor cable in the high slope pile-anchor supporting structure, long-term in situ monitoring was carried out on the slope of Guixiang Road in Changsha City. The countermeasures for the loss of prestressing force of anchor cable are proposed. The dynamic variation of anchor cable tension and the variation of horizontal displacement with time are analyzed. The relationship between anchor cable tension and horizontal displacement is discussed. It is pointed out that the horizontal displacement is also affected by the physical and mechanical properties of the soil, the stiffness of the pile and the groundwater. The design and calculation of pile-anchor supporting structures in high slopes should reflect the characteristics of heterogeneous and nonlinear deformation of the slope .