Effect of Dry-Wet Cycle on Slope Stability of Laterite Subgrade

AbstractIn order to explore influencing factors of stability of laterite subgrade slope under the action of dry and wet cycle, the indoor direct shear tests of compacted laterite under different dry and wet cycles were carried out, and the strength parameters were obtained. The stress correction method was introduced to analyze the influence of the number of dry and wet cycles on the strength of laterite and the influence of stress correction on the analysis results. Based on the results of direct shear tests, Geostudio finite element software was used to simulate the stability and influencing factors of laterite soil subgrade slopes of different heights under different dry and wet cycle times. The results show: (1) The shear strength of laterite decreased with the increasing of the number of dry and wet cycle times, and the shear strength index of laterite after stress correction was added compared with the before correction. (2) With the increasing of the times of dry and wet cycles, the slope stability coefficient gradually decreases as an exponential function. The stability coefficient after correction is increased compared with before correction, and it have great significance to improve the reliability of direct shear test data by using stress correction method in landslide treatment and filling engineering. (3) The stability coefficient of the subgrade slope decreases monotonically with the increase of slope height, and the smaller the slope height of the slope, the better the overall structural stability.