基于滑楔平衡法的土钉力计算

Calculation of Soil Nails Based on Sliding Sphenoid-mass Limit Analysis

现有土钉力计算方法大多是基于土压力理论分析的,而土压力理论在土钉墙中是否适用值得探讨;近年有的学者提出增量法计算土钉力,而增量比例系数颇受争议。针对现有土钉力计算方法的不足,本文提出了有效下滑力的概念和基于滑楔平衡法的土钉力计算方法。通过对有效下滑力分布规律、土钉受力机理分析表明:土钉受力主要受临界深度以下土体的有效下滑力影响。用工程实例对基于滑楔平衡法的土钉力计算方法进行验证,结果表明这种计算方法是合理的。

The existing calculation of nail forces is mostly based on the theoretical analysis of soil pressure, and whether it is suitable to soil nail wall or not is an open question; in recent years, some scholars have proposed an incremental method to calculate the nail forces, but the incremental scale factor is still a controversial problem. Because of the shortcomings in existing calculation mode, in this paper, we proposed a concept of effective down sliding force and the calculation mode based on the theory of sliding sphenoid-mass limit analysis. Analysis by effective down sliding force distribution and the force mechanism of soil nail show that the nail force is mainly affected by effective down sliding force at position deeper than the critical depth. Finally its practical application is proved by taking an engineering project as an example, this calculation mode is reasonable and feasible.