不同土压力模式下土钉受力特征探讨

土钉支护体系作为一种经济、有效的支护方式而得到广泛的应用。但关于土钉力计算的理论依然相对缺乏,远远落后于工程实践,严重制约了土钉技术的发展。基于杨光华提出的土钉力简化计算方法1],以4种不同的土压力模式为背景进行简化,并对比分析不同土压力模式下的土钉力分布,结果表明:采用根据侧壁主动土压力与总土钉力相等并考虑施工过程的影响和增量法的土钉力简化计算方法简便,且采用三角形土压力分布模式与梯形土压力分布模式(二)较采用其他两种土压力分布模式简化计算得到的结果与监测结果更接近。

Discussion on the Characteristics of Soil Nails under Different Earth Pressure Modes

The soil nail support system has been widely used as an economical and effective support method.However,the theory of soil nailing calculation is still relatively lacking,far behind engineering practice,which seriously restricts the development of soil nailing technology.Based on the simplified method of soil nailing calculation proposed by Yang Guanghua1],this paper simplifies the background of four different soil pressure models and compares the soil nail force distribution under different soil pressure modes.The results show that the active earth pressure and total force according to the side wall are adopted.The soil nailing force is equal and considering the influence of the construction process and the simplified calculation method of the soil nailing force is simple,and the triangular soil pressure distribution mode and the trapezoidal(2)earth pressure distribution mode are simplified by using the other two soil pressure distribution modes.The results obtained are closer to the monitoring results.