土钉支护是一种经济便捷的基坑支护方式。以往的土钉支护结构的设计中,多以强度为控制指标,而很少考虑支护结构的变形。通过对土钉面层受力分析,建立了其势能方程。基于最小势能原理推求了土钉支护基坑水平位移的闭合形式解。通过工程算例,将结果分别与实测数据和数值解进行了对比。结果表明:此解析解是合理可行的,可以满足工程需要。 Soil nailing is a kind of economical and convenient method of foundation pit support. In the past, the design of soil nailing support structure mostly uses the strength as the control index, and rarely considers the deformation of the support structure. Through the stress analysis of soil nailing surface, the potential energy equation is established. Based on the principle of minimum potential energy, the closed form solution of horizontal displacement of soil nailing retaining pit is deduced. Through engineering example, the results were compared with the measured data and numerical solution respectively. The results show that this analytical solution is reasonable and feasible and can meet the engineering needs.