桩锚与土钉联合支护结构的概念优化设计

土钉支护体系通过土中设置钉体加强边壁土体,得到支护功效.边壁原状土体强度可得到最大程度的发挥.桩锚支护结构主要通过施加锚杆预应力加强基坑边壁稳定性,控制基坑边壁侧移;将桩锚与土钉构成联合支护结构时,土钉对土体的加强作用使作用于桩锚结构上的土压力得到显著减小,锚杆预应力水平得到显著降低.本文根据桩锚与土钉联合支护结构的受力变形特点和二者的协同工作机理,研究了联合支护结构的概念优化设计方法.

Conceptual Optimization Design of the Combined Retaining Structure of Pile-anchor and Soil Nailing

In soil nailing retaining structure, the retaining efficacy acts by setting nails in soil to strengthen the soil of the side of foundation pit. And the strength of the original soil of side can get its maximal action, in pileanchor retaining structure, the stability of the side of foundation pit is enhanced and its displacements are controlled by. putting the prestress on the anchor. When pile-anchor and soil nailing are combined together, the earth pressure acting on the pile-anchor retaining structure is observably minished and the prestress level will be reduced obviously through the strengthening action of soil nails to soil. In this paper, the conceptual optimization design method of the combined retaining structure of pile-anchor and soil nailing is studied according to the load carrying and deformation characteristic and the mechanism of their work in cooperation.