地铁工程地基的旁压试验研究

介绍了旁压试验原理，针对广州某地铁海相淤泥质地基，采用法国梅那旁压仪进行原位测试；分析了淤泥质地基旁压试验的变形曲线，曲线特征基本反映了海相淤泥土层的力学特征，并由曲线得到其强度参数静止侧压力、临塑压力和极限压力，然后根据轴对称平面应变弹性理论和圆柱孔穴径向膨胀方程得到旁压模量、旁压剪切模量等变形参数及地基各土层的容许承载力．这为采用地铁设计参数提供了参考，对类似的软土地基也有借鉴意义。

Study on Pressuremeter Test to Subway Ground

An in-situ test is used to investigate the mechanical behavior of mucky ground of subway in Guangzhou. The principle of pressuremeter test is introduced firstly in paper, and the P - V curve of pressuremeter test which indicates the mechanical behavior of the mucky ground is obtained according to the test data. The strength parameter including static lateral pressure, critical plastic pressure and ultimate pressure of the mucky ground is analyzed, and the deformation parameter such as pressuremeter modulus and the shear modulus is calculated by using plane strain elasticity theory and radial expansion equation of cylindrical hole in infinite elastic medium. The test give a reference to subway design which has gimilar soft soil foundation.