Macroscopic Embodiment of Stress-Strain Behavior of Backfill Soil on the Displacement-Dependent Earth Pressure Curve

作者：Xie, Tao^*; Luo, Qiang

来源：International Journal of Geomechanics, 2018, 18(12): 04018178.

DOI：10.1061/(ASCE)GM.1943-5622.0001327

• Displacement-dependent earth pressure
• Wall displacement at limit states
• Soil stress-strain behavior
• Initial earth pressure coefficient
• Failure zone

Treating the soil within the failure zone behind the wall as the specimen in a simple shear box, and the soil transition from initial to limit states as the shearing process of soil specimen, a geometrical model was proposed to describe the relation between wall displacement and soil shear strain. Then, a unified expression for predicting earth pressure as a function of wall displacement from active to passive states was established based on the proposed geometrical model. The core parameters for predicting the displacement-dependent earth pressure curve, namely, the wall displacements at active and passive states, can be obtained by this unified expression according to the stress-strain curves of backfill soil. Additionally, analyses indicate that the initial earth pressure coefficient, the failure zone size behind the wall, and the stress-strain behavior of backfill play a decisive role in the displacement-dependent earth pressure curves. These parameters are responsible for the large wall displacement differences at the limit states among various types of backfill soil and under different densities. More importantly, a reasonable agreement between the proposed model and the experimental results in the literature is obvious.

• 出版日期2018-12
• 单位西南交通大学