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旁压试验由于受地表的影响,浅层试验数据并不能正确反映土体真实的物理性质。本文基于圆孔扩张理论,并根据平面应变条件,建立极限平衡方程,从而解得旁压试验的临界深度,并把狭义的匀质土中的临界深度概念推广到了各种复杂土层中,使其具有普遍意义。本文提出的旁压试验临界深度是指旁压试验不受地表影响的深度,在此临界深度以下的Pf或Pl/k可以与地基土的基本承载力建立关系。
Side pressure test due to the impact of the surface, shallow test data does not correctly reflect the true physical properties of soil. In this paper, based on the theory of circular hole expansion, and based on the plane strain conditions, the limit equilibrium equation is established to obtain the critical depth of the pressure-difference test. The concept of critical depth in narrow homogeneous soil is extended to all kinds of complex soils. It has universal significance. The critical depth of the pressure test proposed in this paper is the depth at which the pressure test is unaffected by the surface. Under this critical depth, Pf or Pl / k can be related to the basic bearing capacity of foundation soil.