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库水位的升降变化会引起库岸边坡红土的侵蚀。本文采用室内边坡模型试验和浸泡试验的方法,研究库水作用下库岸边坡红土侵蚀过程中的颗粒迁移、土压力、孔隙水压力的变化及其对应的抗剪强度和渗透性的变化情况。试验结果表明:在相同库水位下,边坡红土颗粒迁移现象不明显,库水位以下的土压力与孔隙水压力都比水面以上的土压力与孔隙水压力值大;随着库水位上升,土体内部孔隙中的气泡随水带出,边坡红土内部的土压力减小,孔隙水压力增大,且两者呈显著的非线性变化;随着浸泡时间的增长,土体抗剪强度先迅速减小,后缓慢回升,之后强度持续降低;渗透系数随浸泡时间延长明显增大;随着浸泡温度的升高,土体抗剪强度先增大后减小,但在常温作用时强度最大。
Changes in the level of the reservoir water level will lead to the erosion of red clay on the bank slope. In this paper, by means of indoor slope model test and immersion test, the changes of particle migration, earth pressure, pore water pressure and their corresponding shear strength and permeability in the process of red earth erosion of bank slope are studied under the action of reservoir water Happening. The test results show that under the same reservoir water level, the migration of red clay particles in the slope is not obvious, and the earth pressure and pore water pressure below the reservoir water level are both greater than the earth pressure and pore water pressure above the water surface. As the reservoir water level rises, The bubbles in the pores of the body are carried out with water, the soil pressure on the slope laterite decreases, the pore water pressure increases, and the two show significant nonlinear changes. With the increase of soaking time, the shear strength of soil The strength gradually decreases with the increase of immersion time, and the shear strength of soil increases first and then decreases with the increase of immersion temperature, but the strength is the highest at room temperature .