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摘要: 为研究切坡建房对边坡稳定性的影响，本文通过统计分析浙江省余杭区鸬鸟镇地质灾害发育分布特征与成灾模式，概化四类具有不同坡度的斜坡模型，利用有限元极限平衡法模拟计算斜坡开挖后应力、应变分布及安全系数变化规律，借助函数曲线拟合边坡开挖进尺与安全系数间的关系，推算出斜坡开挖失稳时的开挖进尺临界值。得出以下结论：（1）未开挖状态，斜坡潜在失稳区位于坡顶处，开挖后坡脚附近失稳概率高于坡顶。（2）斜坡开挖后，坡度与开挖进尺共同影响边坡稳定性，且坡度影响大于开挖进尺。（3）误差分析发现，坡度小于20°斜坡的临界值误差较大，坡度大于20°斜坡的临界值误差较小。Abstract: In order to study the influence of excavation and house building on slope stablity, this paper analyzes the distribution and disaster models of geological disasters in the area of Luniao Town, Yuhang District, Zhejiang Province, and generalizes four types of slope models. The finite element limit equilibrium method is used to simulate the variation of stress, strain distribution and safety factor after the slope excavation, and then the threshold value of the excavation footage at the time of instability can be obtained through fitting the relationship between slope excavation footage and slope safety factor by the function curve. The result shows that:(1) Under natural conditiond the potential instability zone of the slope is located at the slope crest, and the probability of instability near the slope is higher than the other part of the slope. (2) When the slope is excavated, the slope and the excavation footage will jointly affect the slope stability, and the effect of the slope is greater than the excavation footage. (3) The error analysis shows that the threshold error of the slope with slope less than 20° is larger, and the threshold error of the slope with slope greater than 20° is smaller.
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