扁铲侧胀试验应力路径的三轴模拟分析

Laboratory simulation on stress path of flat dilatometer test based on advanced tri-axial apparatus

以分析靖江地区部分扁铲侧胀试验(DMT)的加载应力路径为基础,应用英国GDS公司生产的标准应力路径三轴试验系统对土体应力路径进行室内模拟试验研究,通过试验得到土体静止压力系数K0、水平基床系数Kh以及侧限垂直排水模量M,并与DMT试验结果进行对比分析。结果表明,这种由应力路径模拟获取的土体参数与扁铲试验由一般经验公式估算得到的结果具有一定的差异性,其中DMT与GDS室内试验模拟得到的静止侧压力系数以及侧限垂直排水模量差异性较大,水平基床系数的差异性相对较小。

Based on the analysis of loading path of flat dilatometer test in Jingjiang area situ,with standard stress path tri-axial system produced by GDS of UK used,laboratory simulation on stress path of flat dilatometer test（DMT） were carried out.Many geologic parameters are acquired,such as lateral pressure coefficient,horizontal coefficient of sub-grade reaction and vertical drained-confined tangent modulus,by analyzing the laboratory experiment result.The comparative analysis between DTM and laboratory experiment showed that differentiation on result,especially on lateral pressure coefficient and horizontal coefficient of sub-grade reaction,but a little differentiation on vertical drained-confined tangent modulus.