【摘要】 峨眉山玄武岩是西南地区广泛分布的岩类,在水电工程中经常遇到。玄武岩的原生建造、构造作用和风化卸荷,对岩体结构和工程性状有较大的影响。成岩中形成的层面构造和层节理是层间错动和层内错动产生的基础。节理裂隙影响岩体的完整性和局部岩体结构,其对岩体力学性状的影响可以通过现场试验来获取。层间和层内错动带控制了宏观岩体结构和工程岩体的性状,是许多工程地质问题的重要地质边界,其对工程岩体力学性状的影响,通过岩体质量分级和受荷特点分析,综合反映其结构效应和力学参数。新鲜完整的玄武岩为高强度、高模量、具脆弹性特征的各向同性岩体;弱风化较完整的玄武岩,仍有较高的强度和模量,但具有弹塑性特征和一定的结构效应;弱风化完整性较差的玄武岩及错动带的强度和模量较低,具有较明显的塑性特征和结构效应。更多还原

【Abstract】 E′mei Mountain basalt is a common kind of rock in southwest china and often found in hydropower engineering construction. The rock mass texture and engineering property are obviously influenced by the primary formation,tectonism,weathering and unloading of basalt. Bedding structure and bedding joint formed in rock formation are the basis of inter-formational and intra-formational shear fractures. Joints affect the integrity and structure of rock masses. The effects of joints on the rock mass mechanical properties can be shown by in-situ tests. The inter-fomational and intra-formational shear fractures govern framework structure and engineering property of rock masses,and consist of the major geological boundaries in many engineering geological problems. Their influences on the mechanical properties of engineering rock masses are shown in structure effect and mechanic parameters by quality classification of rock masses and loading analysis.更多还原