基于改进载荷试验的泥岩地基承载力研究

Research on Bearing Capacity of Mudstone Foundation Based on the Improved Rock Loading Test

改进了岩基平板载荷试验,模拟边载对泥岩承载力的影响,并在成都市天府新区某工程场地上进行了4个试验点的现场中等风化泥岩岩基平板载荷试验,得出了各自相对应的p-s曲线。试验表明:①在施加200 kPa边载的条件下,泥岩的承载力较无边载时的承载力有了0.7~0.9倍的提升,泥岩有进行深度修正的必要并尝试得出适合的深度修正系数。②结合室内岩石单轴抗压强度试验的结果,根据规范方法反算折减系数相较规范的建议的折减系数值,规范的建议值偏保守,在确定成都泥岩地基承载力采用室内单轴抗压强度试验时,折减系数可适当提高。

In order to simulate the effect of edge loads on the bearing capacity of mudstone,improved rock plate loading test and carried out four pilot sites weathered mudstone rock loading test on a project site in Chengdu Tianfu new area and obtain the corresponding p-s curves.Experiments show that：①Under the condition of applying 200 kPa edge loads,the bearing capacity of mudstone has the 0.7 to 0.9 times increase compare with applying no edge loads,there needs to have the modification of depth for mudstone.Also try to get an appropriate depth modified coefficient in this paper.②Combining the rock loading test results with the results of indoor rock uniaxial compressive strength test,to do inverse computation of reduction factor according to the standard method which draw the conclusion that the value of the standard proposal is conservative.When the bearing capacity of mudstone in Chengdu is determined by the uniaxial compressive strength test,the value of reduction factor could be improved appropriately.