土钉墙非线性数值分析与规范比较

为完善土钉支护设计方法,利用国际通用岩土工程分析软件(FLAC),对土钉墙在分步开挖下的变形和受力进行了分析,并与现行2种规程的轴力计算结果进行了对比,指出了现行规程的不足,认为土钉的轴力不仅与土钉所控土层的土压力有关,而且主要是由于分步开挖过程中边坡变形积累产生的土钉与土体之间相对位移趋势的增大和群体土压力共同作用的结果.建议适当加大第一排土钉的长度,加强面层与土钉的连接.

Numerical Nonlinear Analysis of Soil Nailing Wall and Comparison With Codes

The paper analyses the deformation and the force condition of the soil nailing wall during its step-by-step excavation. The universal analysis software FLAC for geotechnical engineering and the numerical stimulating method are used in the process of analysis. Comparing with the axial force calculation result of CEC97:98 and JGJ 120-99, the paper tells the limitation of the current code pointing out that the axial force of soil nailing is nor only associated with the soil pressure of the controlled soil layer but mainly correlated with the increasing of the trend of the relative displacement between soil nailing and soil which is because of the accumulated deformation during the step-by-step excavation process. The paper also suggested that the first row of soil nailing should be lengthened or the soil property should be improved to enhance the shoring effect and to intensify the joint action between the soil layer and the soil nailing.