【摘要】 蚀变辉绿岩是中国西部工程建设中一种较常见的岩体，其蚀变程度对工程岩体的性状影响极大。以在建的大渡河硬梁包水电站蚀变辉绿岩为研究对象，根据蚀变辉绿岩的宏观地质特征、岩石矿物学特征及力学试验成果对其进行了类型划分，并引入模糊数学理论对蚀变辉绿岩进行围岩分级。研究表明：复杂的地质构造作用，造就了工程区内分布广泛的辉绿岩蚀变带；蚀变辉绿岩可分为微蚀变辉绿岩、碎裂化辉绿岩、碎裂辉绿岩、辉绿角砾岩、片理化辉绿岩和泥化辉绿岩6类；随着蚀变程度增强，辉绿岩的碎裂化及高岭石、绿泥石等黏土化程度逐渐增高，相应其力学强度逐渐降低。根据辉绿岩蚀变特征，选取饱和单轴抗压强度、黏聚力、完整性系数、结构面特性参数、蚀变指数作为围岩分级依据，建立了蚀变辉绿岩围岩分级的模糊综合评判方法，得到了岩质类型与围岩等级的对应关系。最后以该电站开挖的两条引水隧洞内的多条蚀变辉绿岩带为例，对方法的可行性和合理性进行了验证，围岩评判结果与现场情况吻合较好，表明该方法具有较好的适用性。更多还原

【Abstract】 Altered diabase is one of the common rock masses in engineering construction in western China, and its alteration degree has a great influence on the characteristics of engineering rock mass.In this paper, the altered diabase of the Yingliangbao Hydropower Station under construction on Dadu River was taken as the research object, and the types of altered diabase were classified according to the macroscopic geological characteristics, rock mineralogical characteristics and mechanical test results, and the fuzzy mathematical theory was introduced to classify the degree of surrounding rock of altered diabase.The results show that a wide distribution of diabase alteration zones in the project area was formed under the complex geological tectonic action, and the altered diabase could be divided into six categories: mild-altered diabase, cataclastic diabase, cracked diabase, diabase breccia, schistose diabase and argillaceous diabase.With the deterioration of alteration degree, the fragmentation of diabase and the degree of clayification such as kaolinite and chlorite gradually intensified, so the corresponding mechanical strength gradually decreased.According to the alteration characteristics of diabase, the saturated uniaxial compressive strength R_c,cohesion c,integrity coefficient K_v,structural plane characteristic parameter J_c and alteration index k_s were selected as the basis for the classification of surrounding rock, and a fuzzy comprehensive evaluation method for the classification of altered diabase surrounding rock was established, and the correspondence between rock type and surrounding rock grade was obtained.The feasibility and rationality of the method were verified by taking the multiple alteration diabase zones in two excavated diversion tunnels as an example.更多还原