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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。
Most of the existing methods for calculating soil nailing force are based on the theory of earth pressure. Whether soil pressure theory is applicable in soil nailing wall is worth discussing. In recent years, some scholars have proposed incremental method to calculate soil nailing force, while incremental scale factor dispute. In view of the shortcomings of existing methods of calculating soil nail strength, this paper presents the concept of effective sliding force and the calculation method of soil nail force based on the sliding-wedge balance method. Through the analysis of the law of the effective sliding force distribution, the mechanism of soil nailing stress shows that the soil nailing force is mainly affected by the effective sliding force of the soil under the critical depth. The engineering example is used to verify the calculation method of soil nail force based on the sliding-wedge balance method. The results show that this method is reasonable.