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新规范(GBJ7-89)对老规范(TJ7-74)用作计算地基沉降的E_3值有了较大修改,(GBJ7-89)规范则要按实际应力范围取值,即以土的压缩系数a=(e_1—e_2)/(P_2-P_1)代替(TJ7-74)规范土的压缩系数a_(1-2)=(e_1-e_2)/(p′_2-p′_1),其中P′_2、P′_1为定值,即取P′_2=200kPa,P′1=100kPa,而P_2、P_1则按实际应力取值。本文就试图通过对两种不同的计算方法的分析比较,从而得出一些结论。 1.两种计算公式的比较土的压缩模量是反映土在侧限条件下受力方面上的应力与应变之间的比值关系。根据土力学的理论公式推导,在侧限条件下,当压力增量AP=p_2-p_1时,相应的应变为:
The new code (GBJ7-89) has made great changes to the old standard (TJ7-74) used to calculate the settlement of the foundation E_3 value has been greatly modified (GBJ7-89) norms should be based on the actual value of the stress range, that is, the soil compressibility (1) = (e_1 -e_2) / (p’_2-p’_1) in the soil of the standard (TJ7-74) with a = (e_1 -e_2) / (P_2-P_1) _2, P’_1 is fixed value, namely take P’_2 = 200kPa, P’1 = 100kPa, and P_2, P_1 according to the actual stress value. This article attempts to analyze and compare two different calculation methods to arrive at some conclusions. 1. Comparison of Two Computations The compressive modulus of soils reflects the ratio between stress and strain in soil under confined conditions. According to the theoretical formula of soil mechanics, under the confining condition, when the pressure increment AP = p_2-p_1, the corresponding strain is: