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对于线路工程上具有普遍性的岩质边坡,因数量多,范围广,工程勘察深度相对较浅。依据规范的测试和试验,建立一种基础性岩体质量评价方法,实现边坡工程岩体分级,并根据行业要求与经验提出支护措施,对提高岩质边坡工程设计与施工的科学性无疑具有重要的意义。针对现有的《工程岩体分级标准》(GB50218—94)没有涉及边坡工程岩体分级,在深入研究和系统消化边坡工程岩体分级成果基础上,提出基于岩体质量指标BQ的岩质边坡工程岩体分级方法(简称BQ-RSlope方法)。该方法在岩体基本质量指标基础上,考虑控制边坡稳定性的主要结构面类型与延伸性、结构面产状与坡面间关系以及边坡内地下水发育程度等影响因素,对岩体基本质量指标进行修正,由此确定边坡工程岩体级别,并给出各级别边坡工程岩体自稳能力的评价。结合4个边坡工程10个坡段的应用性验证,表明依据文中方法获得的各边坡坡段的岩体质量分级以及该基于质量指标对边坡稳定性的评价结果与工程实际总体相符,提出的依据BQ的岩质边坡工程岩体分级方法是合适的。
For the common rock slope engineering in line engineering, due to the large quantity and wide range, the depth of engineering survey is relatively shallow. Based on the standardized tests and tests, a method for evaluating the quality of rock mass is established to classify rock mass of slope engineering. According to the requirements and experience of the industry, support measures are proposed to improve the scientific design and construction of rock slope engineering No doubt has an important meaning. Aiming at the existing classification criteria of engineering rock mass (GB50218-94), it does not involve the grading of rock mass in slope engineering. On the basis of further research and systematical digestion of rock mass grading results of slope engineering, the rock mass index BQ Mass slope engineering rock mass classification method (referred to as BQ-RSlope method). Based on the basic mass index of rock mass, the method takes into consideration the influencing factors such as the types and extents of the main structural planes controlling the slope stability, the relationship between the occurrence of the structural plane and the slope and the degree of groundwater development in the slope, Quality index correction, to determine the level of rock slope engineering, and gives the evaluation of rock slope self-stability ability of all levels of slope engineering. Combined with the application verification of 10 slope sections in 4 slope projects, it is shown that the rock mass classification of each slope slope section obtained from the paper and the evaluation results of slope stability based on the quality index are consistent with those of engineering practice. The proposed rock slope classification method based on BQ is suitable.