预应力锚杆框架梁的支护力学行为研究

Mechanical behaviors of frame beam supporting structure with prestressed anchors

采用实际工程数值模拟,结合现场试验与测试以及变换设计参数进行数值仿真试验等,对预应力锚杆框架梁支护体系加固边坡的力学响应、支护体系与加固坡体之间相互作用的空间力学效应以及支护体系的力学响应对设计参数的敏感性等问题进行了研究。结果表明,预应力锚杆框架梁的支护力学性状表现出张拉和稳定工作两个不同阶段,设计时应主要考虑位于坡脚附近的框架梁与锚杆的内力在稳定工作阶段有所上升的不利影响,锚杆的锚固预应力、锚固角和锚固间距均对支护体系的内力和加固边坡的压缩变形有显著影响。

Based on numerical simulation in combination with field tests and measurements for strengthening works of a slope,as well as numerical experiments by varying the design parameters,mechanical behaviors and sensitivity analysis of frame beam supporting structure with prestressed anchors were studied;moreover,the interaction between the supporting structure system and slope was also discussed.The results show that there are two different stages when this supporting structure system strengthening slope;and they are respectively tension stage and stability stage.One should pay attention to the adverse effects in design that the inner forces of the frame beam and the anchor near slope toe increase during stability stage in work.Furthermore,results of parameter sensitivity analysis show that the prestress,angle,and spacing of the anchor have significant impacts on the inner forces of the supporting structure system and the compression deformation of the reinforced slope.