预应力锚杆(索)框架梁加固边坡的仿真试验分析

Numerical simulation tests on lattice beam with prestressed cable

采用数值仿真试验方法研究了预应力锚杆框架梁支护体系中框架梁和锚杆的受力特点,为地震引发滑坡灾害的防治提供依据。研究结果表明:框架梁的弯矩在锚头处取得最大值,且随锚固预应力的增加而增大,但并不呈线性关系;即使在相同土质条件和同一锚固预应力作用下,坡脚处框架梁的弯矩要高于坡顶;此外,锚杆的预应力均存在一定的损失,施加的预应力值越高,预应力损失越大,且坡脚锚杆的预应力损失比坡顶小。

The stress features of lattice beam with pre-stressed cable system are studied by 3 D finite-difference program of FLAC3D. The results show that the moment of lattice beam increases as the pre-stress of cable increases. But the relationship is nonlinear. Even if the pre-stress and the soil condition are all equal, the movement of the lattice beam at slope toe is higher than that at slope crest. And then the pre-stress loss of cable is analyzed. The higher the pre-stress is imposed, the greater the loss of pre-stress will be. And the loss of pre-stress at slope toe is smaller than that at slope crest.