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中文摘要：
在对黑方台地区的黄土进行3种含水率条件下的直接剪切试验和重塑土的反复剪切试验,并收集该区地层力学参数,利用21组实测边坡的坡高坡度建立地质模型,采用Monte Carlo法进行边坡可靠度分析,结果表明：该区黄土黏聚力基本为零,边坡稳定性与坡度显著相关,以5%作为可接受概率,则边坡稳定坡度为27.2°。对于坡度大于27.2°的边坡,宜做防护或改善地下水环境等措施。
英文摘要：
A geological model is established for loess slopes in Heifangtai in Gansu Province It is based on the direct shear tests and the repeated direct shear tests of Heifangtai loess soils.It also collects the physical character and shear strength of soil,and the height and angle of 21 slopes at Heifangtai.The failure probability of the slopes were calculated by the Monte-Carlo method.The results show that cohesion of loess in Heifangtai is nearly zero,and the probability of the slopes is correlated with the angle of slope.If 5%is acceptable probability,the stable angle of slope is 27.2°.The slope with angle more than 27.2°needs to be protected as soon as possible.
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