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基于反映裂隙影响的膨胀土边坡稳定性的极限平衡法,提出了通过将边坡划分为裂隙充分发展区A、坡顶张拉裂隙区A′、裂隙发育不充分区B、坡顶张拉裂隙区B′、坡脚雨水积聚影响区C以及无裂隙区D,近似反映坡顶张拉裂隙以及坡脚渗流积聚对边坡稳定性的影响.研究确定了C、B′区域的强度指标取值,尝试对该极限平衡方法进行完善补充.利用毕肖普法进行实例计算,结果表明:单独考虑坡脚雨水积聚和坡顶张拉裂隙影响时边坡安全系数分别下降0.271和0.082,同时考虑两者影响时降幅达9%.提出的方法能够反映膨胀土滑坡的特点,同时可以计算裂缝发展极限状态时边坡的稳定状态.
Based on the limit equilibrium method that reflects the stability of expansive soil slope affected by fractures, this paper puts forward that by dividing the slope into fully developed fractured zone A, tension fractured zone A ’, insufficiently developed fractured zone B, Fracture zone B ’, rainwater accumulation impact zone C and no fracture zone D approximately reflect the effect of slope tension fracture and slope foot seepage accumulation on slope stability. The strength index of C and B’ area is determined The result of calculation by Bishop method shows that the safety factor of slope decreases by 0.271 and 0.082 respectively when considering the accumulation of rainwater on slope foot and the effect of tension failure on the top of rock slope, The impact of decline of up to 9% .The proposed method can reflect the characteristics of expansive soil landslide, while the stability of the slope can be calculated when the limit state of fracture development.