软岩旁压试验与单轴抗压试验对比研究

Comparative study on PMT and uniaxial compressive test on soft rock

在我国广泛分布的白垩系至第三系泥质粉砂岩是一种软质岩石,具有较大的地基潜力。按现行规范确定的承载力值往往偏低。在大量试验资料基础上,建立了旁压试验特征参数与岩石单轴抗压强度的相关方程,并同岩基载荷试验进行对比。实践证明,旁压试验是一种有效的原位测试方法,对确定同类地区软岩地基的承载力具有推荐价值和指导意义。

Argillaceous siltstone is a kind of soft rock, which is widespread during Cretaceous to Eogene in China. The potential bearing capacity of this rock is relatively larger. But the bearing capacity evaluated with current Code is quite different to that obtained on site test. The correlation between pressuremeter test （PMT） and uniaxial compressive test on sedimentary rock are studied; and the correlation equations are established for characteristic parameters of PMT and compressive strength. The result of analysis shows that PMT is rather effective for determining the bearing capacity of this kind of soft rocks and is deserved to be applied to practical problems such as those on soft rocks.