工程地质学报2012，Vol.20Issue(6)：934-939,6.
膨胀土干湿循环效应及其对边坡稳定性的影响
WETTING-DRYING EFFECT OF EXPANSIVE SOILS AND ITS INFLUENCE ON SLOPE STABILITY
摘要
Abstract
The wetting-drying effect of expansive soils plays an important role in slope stability analysis. This paper uses the field monitoring data of moisture contents of expansive soil slope and the calculation results of atmospheric influence depth at Nanling region. It then determines the wetting-drying circulate amplitudes of laboratory experiments. Laboratory tests on the soil strength are performed to discuss on the wetting-drying effect of expansive soil. Furthermore, the stability of expansive soil slope is studied taking into account the wetting-drying effect. The results show that the cohesion of expansive soil decreases with increasing number of cycles and its impact is especially obvious during the first and second cycles. After that, it reaches to a constant state. However, the friction angle keeps a stable value with little influence of the wetting-drying effect. It is also found that the value and cyclic number of the constant state reduce with increase of amplitude of variation of water content. As wetting-drying cycles cause irreversible damages to soil intergranular links, the shear strength reduction of expansive soil is the result of micro-structural degradation. Furthermore, the slope stability and safe factor decrease with increasing number of cycles and the stability analysis method with considering the wetting-drying effect is more in line with the practical engineering.关键词
膨胀土/干湿循环效应/边坡稳定性/大气影响深度Key words
Expansive soil, Wetting-drying effect, Slope stability, Depth of atmospheric effect分类
建筑与水利引用本文复制引用
曾召田,吕海波,赵艳林,蒋文宇..膨胀土干湿循环效应及其对边坡稳定性的影响[J].工程地质学报,2012,20(6):934-939,6.基金项目
973前期研究专项(2010CB434810),国家自然科学基金(51169005)和广西自然科学基金(2010GXNSFD013012). （2010CB434810）
