旁压试验的临界深度

The critical depth of pressuiemeter test

本文用大模型槽内砂土旁压试验的结果说明:砂土旁压试验的临界深度为2—2.5米。在试验中,还量测了a_z、σ_r和σ_θ以及砂面的垂直位移。本文指出当旁压土体处于平面应变条件时,旁压压力才达到比较稳定的值。临界深度以下的pf或pt/K可以与地基土的基本承载力σ_o建立关系。

This paper manifests that the critical depth of pressuremeter test is 2-2.5m. This is based on the results of model test done in large trough.During the test, the stress components:σ_(z),σ_(r), σ_(θ) and vertical displacement on the surface of the sand are measured.It is pointed out that only when the soil mass is in a state of plain strain, the pressuremeter test can yield stable results. Values of p(f) or p(1)/K taken below the critical depth can be correlated with the basic value of bearing capacity σ_0.