The occurrence of landslide has correlations with the atmospheric temperature change. Assessing the influence of changes in atmospheric temperature on landslides is helpful for the landslide treatment. This study simulates rainfall infiltration in a homogeneous soil slope under varying atmospheric temperatures based on water–air two–phase flow theory and the heat transfer equation. The safety factor of a slide slip is calculated using the residual thrust method under different atmospheric temperatures. The results show that changes in atmospheric temperature affect the seepage field of a slope, possibly affecting the slope stability. Under the same initial and rainfall conditions, the higher the atmospheric temperature is, the higher the rainfall infiltration rate; the deeper the infiltration depth is, the higher the air pressure in the slope and the lower the slope safety factor. Numerical simulations show apparent correlations between atmospheric temperature changes and the safety factor of a slope. Thus, the higher the atmospheric temperature is, the lower the safety factor of a slope. Under certain conditions, changes in atmospheric temperature may trigger landslides.

Influence of atmospheric temperature on shallow slope stability

According to in-situ monitoring data, the displacement of rock slope varies with time, and the variation of air temperature is doubted to be one of the influencing factors. Through the calculation of the temperature and displacement fields for the rock slope of the powerhouse of the Geheyan Hydropower Station, it is found that the influence of air temperature on the displacement of the slope is only in the range of several millimeters, while the fluctuation of measured displacement is in the range of several centimeters; besides, the fluctuation of calculated displacement is annually changed, while the variation of measured displacement shows no obvious periodicity. Therefore, the variation of air temperature is not the main factor affecting the displacement of the slope. Moreover, some regularities about the displacement varying with air temperature are also found through calculation: the variation of displacement lags behind that of air temperature for 35-75 days; the influence of air temperature on rock mass can reach a depth of 10 m; the steady temperature of rock mass is about 17?℃, etc.

Effect of air temperature variation on displacement field of rock slope at Geheyan Hydropower Station

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Effect of air temperature variation on displacement field of rock slope at Geheyan Hydropower Station