主被动复合支护结构的协同工作机制研究

为进一步研究主被动复合支护结构的协同工作机制,以预应力锚杆复合土钉墙为研究对象,采用理论分析与数值模拟相结合的研究方法,分析施工过程中土压力在土钉与预应力锚杆之间的分配规律,总结不同支护机理构件间的协同工作机制.采用改进的增量法逐层计算施工过程中的水平位移,建立主被动复合支护结构的变形计算理论,并考虑施工过程中的各种影响因素.研究结果表明,预应力锚杆设置两层满足优化设计理论,邻近位置的土钉受预应力锚杆的影响较大,应用改进的增量法计算坑壁水平位移简单方便可靠.

Study on coordinative working mechanism of active-passive composite supporting structure

In order to further study the coordinative working mechanism of an active-passive composite supporting structure,the soil nailing wall reinforced by pre-stressed anchors （SNWRPA） is researched through theoretic analysis and numerical simulation.The distribution of soil pressure between soil nailing and anchor force is analyzed,and the various coordinative working mechanism of components is studied.An Improved Increment Method （IIM） is adopted to calculate the horizontal displacement of a composite soil nailing wall in construction,deformation theory is put forward,and several influential factors are considered.Such conclusions are reached.Firstly,pre-stressed anchors should be set for two layers to satisfy optimization design theory.Secondly,soil nailing forces nearby will be affected by pre-stressed anchors.Thirdly,IIM will be simple,convenient and reliable for the calculation of horizontal displacements of a composite soil nailing wall.