埋置深度对T型触探贯入阻力影响研究

假定软土强度服从Tresca曲服准则，采用数值模拟方法，研究了探头贯入深度对贯入阻力的影响。研究发现，对于轴长比为0.5的椭圆形、矩形和菱形截面探头，当探头中心埋置深度达到4~6倍探头宽度时，贯入阻力趋于定值，探头埋置深度对于工程实践测试结果的影响可以忽略。对于椭圆形和菱形截面探头，以及光滑表面矩形探头，该值与无限软黏土空间理论分析结果一致。对于粗糙表面矩形探头，该值大于无限软黏土空间理论分析结果，粗糙表面矩形探头贯入阻力解析解为近似解。矩形截面探头测试结果需进行适当修正。

RESEARCH ON THE INFLUENCE OF EMBEDMENT ON THE PENETRATION RESISTANCE OF T-BAR TEST

Assuming that the soft soil strength obeys the Tresca rule, the influence of the depth of probe embedment on the resistance of T-bar penetration was studied by numerical simulation. It is found that, for the oval, rectangular and rhombus cross section probes with aspect ratio of 0.5,when the depth of the probe centre reaches 4~6 times the probe width, the penetration resistance tends to be fixed. The influence of probe embedment depth on the engineering practice results can be ignored. For oval and rhombus section probes and smooth surface rectangular probes, this value is consistent with the theoretical analysis in infinite soft clay. For the rectangular probe with rough surface, this value is larger than that in infinite soft clay. Analytical solution for penetration resistance of rectangular probe with rough surface is an approximate solution. The results of rectangular cross section probe need to be corrected appropriately.