A study of the stability of rock excavated slope based on rockmass structure and unascertained measure evaluation models
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摘要: 综合黔西地区层状岩质开挖边坡研究成果发现：岩体结构特征是分析评价层状边坡变形失稳模式、机制和稳定性的重要基础。因此，结合该地区层状边坡地质条件的差异性，针对性地划分岩体结构类型对边坡的分析评价尤为重要。考虑地层岩性组合、地质构造、软弱夹层（结构面）因素，系统地将边坡岩体结构类型分为4个大类（近水平-缓倾边坡岩体，倾斜层状边坡岩体，陡倾、直立、倒转层状岩体，地质构造作用强烈或含有溶蚀洞穴、沟壑的边坡岩体）和10个亚类，并针对相应类型的边坡进行工程地质综合评价，分别阐述了失稳模式和机制。以边坡岩体结构类型为基础，甄选影响开挖边坡稳定性的6个定性指标和6个定量指标；对指标组合赋权，用未确知测度理论对边坡进行稳定性预测评价，建立了“岩体结构-指标组合赋权-未确知测度理论”的新评价体系。实例预测结果表明预测结果与实际情况具有较好的一致性，说明该方法是一种可靠性高、科学合理的稳定性预测新方法，可在相关工程领域中应用推广。Abstract: Based on the investigation of excavated layered slopes in the Qianxi area, it was found that the structure characteristic of rock mass is the main determinant of instability mechanism and failure mode of layered slopes. Therefore, in combination with the differences of layered slopes in this area, it is particularly important to analyze the slopes by specifically classifying the rock masses. The structure of rock mass can be systematically divided into 4 categories and 10 sub-categories, considering the lithology combination of layers, geological structure and weak interlayer (structural surface) as factors, and for every type of rock mass, the engineering geological properties are evaluated, and the failure mode and mechanism are explicated. Based on the structure type of rock mass, 12 impactors, including 6 quantitative indexes and 6 qualitative factors, are selected for slope stability prediction using the uncertainty measure theory. A new evaluation system of “rock mass-indicator combination weighting-uncertainty measure theory” is proposed. This method is applied to predict the stability of eight slopes, the prediction results are nicely conform to the actual situations. This method is highly reliable and can be used in practical slope engineering.
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Key words:
- layered slopes /
- structure types /
- stability prediction /
- combination weighting /
- unascertained measure
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