支护参数对复合支护基坑变形的影响分析

复合支护技术作为一种有效支护浅基坑（H≤7 m）的围护结构得到了广泛运用。在工程实践的基础上，运用平面弹塑性有限元法，从不同的支护方法及支护参数分析讨论了对变形的影响，初步得出基坑的侧向变形特性。对于采用复合支护的基坑，它的最大位移发生在基底附近，这与采用土钉支护的基坑不同。对于复合支护的基坑，采用适当的坡度可有效地提高支护效果。

Study of effect of supporting parameters on deformation behavior of excavation with composite supporting

The composite support form for shallow excavation of depth H≤7 m has been suggested and widely used in recent years. Basing on the engineering practice, we adopt the elastoplastic model and use plane finite element method to analyze the effect of supporting parameters on the deformation behavior of excavation with composite supporting. The general principle of deformation behavior of different support methods is obtained. When the soil nails and piles are adopted simultaneous as composite support system, they will notably enhance the effect of the support; and the deformation behavior is different from that using soil nail merely, and the maximal displacement of the supporting system will move downwards closely to the bottom of foundation pit. And when the appropriate angle of the slop is used the composite support form will control the displacement of the side of foundation pit more effectively.