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。 In this paper, the results of the sand pressure test in the large model tank indicate that the critical depth of the sand pressure test is 2 to 2.5 meters. In the experiment, the vertical displacements of a_z, σ_r, and σ_θ and the sand surface were also measured. In this paper, it is pointed out that when the lateral pressure soil is in the plane strain condition, the pressure of the side pressure reaches a relatively stable value. The pf or pt/K below the critical depth can be related to the basic bearing capacity σ_o of the foundation soil.