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土压力计算问题虽然是岩土工程中的传统研究课题之一,但对于结构性黄土而言,抗剪强度和抗拉强度是结构性黄土强度特性的两个方面,因此,黄土抗拉强度在黄土土压力计算中存在的影响需要进行合理的评价。基于建立的可综合考虑黄土抗拉和抗剪特性的联合强度理论,开展了主动极限应力平衡分析,推导了主动土压力新的计算公式,对该计算公式进行了验证并与朗肯主动土压力进行了比较。研究结果表明:在主动土压力计算与比较中,基于黄土联合强度确定的主动土压力比基于传统的Mohr-Coulomb理论确定的朗肯主动土压力要大,且墙后填土拉张区开裂深度相对要小。由于Mohr-Coulomb强度理论高估了黄土的抗拉强度,导致朗肯主动土压力计算值偏小,而基于黄土抗拉强度建立的联合强度可以合理地评价黄土的主动土压力。
Although the problem of earth pressure calculation is one of the traditional research topics in geotechnical engineering, the shear strength and tensile strength of structural loess are two aspects of the strength characteristics of structural loess. Therefore, the tensile strength of loess Loess earth pressure calculation of the impact of the need for a reasonable evaluation. Based on the established joint strength theory which can comprehensively consider the tensile and shear properties of loess, an active limit stress equilibrium analysis is carried out. A new formula of active earth pressure is deduced. The formula is validated and compared with Rankun active earth pressure Compared. The results show that in the calculation and comparison of active earth pressure, the active earth pressure determined based on the joint strength of loess is larger than Rankun active earth pressure determined based on the traditional Mohr-Coulomb theory, and the cracking depth Relatively small. Due to the overestimation of the tensile strength of loess by Mohr-Coulomb theory of strength, the calculated value of Rankine’s active earth pressure is small, and the active earth pressure of loess can be reasonably evaluated based on the joint strength established by the tensile strength of loess.