【作者】 余先华；

【导师】 聂德新；

【作者基本信息】 成都理工大学 ， 地质工程， 2007， 硕士

【摘要】 溪洛渡水电站在可行性研究阶段选择微风化～新鲜岩体作为拱坝两肩的建基岩体，但在设计阶段，本着安全、可靠、经济、合理的原则，在满足拱坝变形和稳定的控制条件下，对建基面进行优化，将两岸拱座的嵌深平均减小13m左右，两岸拱肩槽坝基可利用岩体主要为弱下风化的Ⅲ₁级岩体，低坝段部分利用到弱上风化的Ⅲ₂级岩体，这对于高坝坝基可利用岩体的标准都是新的、重大的突破，同时也为如何合理对工程地质评价提出了新的尝试和实践。本论文以溪洛渡水电站两岸拱肩槽为研究对象，通过现场地质调查，全面地获取地质资料，系统地开展多种测试工作，用多种方法分析两岸拱肩槽建基岩体的工程地质综合特征。特别是根据斜坡从表部向斜坡内部（或深部）岩体中的裂隙是由逐渐减少到一基本稳定值，岩体结构呈现散体结构→碎裂结构→镶嵌碎裂结构→次块状结构→块状结构→整体块状的过渡规律。运用这一特征，在将河谷斜坡岩体中大的构造断裂造成的局部岩体碎裂和通道式风化单独处理后，对于同样岩性、早期经历的构造改造相同或相近的岩体，它们在河谷斜坡的风化、卸荷等浅表生改造作用下，裂隙的减少，岩体结构的改变，风化程度的变化、岩级的变化和岩体力学参数的变化是同步发生的，其变化程度也具有对应性。因此，利用上述对应关系，可以用作岩体的多种评价：岩体结构、岩体风化、岩体质量类型以及力学参数。更多还原

【Abstract】 XiLuoDu hydropower Station chose slightly weathering and new rocks as bedrocks on the two shoulders of the arch dam in the studying period of feasibility. But in the period of designing according to the principles of safety, reliability, thrift and rationalization, on the condition of being satisfied with the deforming of the arch dam and reliability, the surface of the project was optimized and the embedding depth of the two shoulders was cut by about 13m. The usable rocks of arch shoulders’ notch are mainlyⅢ₂ ones. If those rocks were used in the parts of low dam it would be a new and great breakthrough forγthe standard of usable rocks in the parts of high dam; and at the same time it also raised new attempt and practice for how to evaluate the geology of the project.In the essay I take XiLuoDu hydropower station’s arch shoulders’ notch as researching objects, through geological investigation on the scene I gained all-round information, launch many tests systematically and used many methods to study the overall characters of the notch’s rocks. According to the law of the crack in the rocks which lessened gradually to a stable value from the surface to the inner part----rocks’ structure being loose→crumbling→inlaid crumbling→,hypo-cubes→,cubes→whole cubes. With the law if it was singly handled part broken rocks by big structural breaking and weathering like a passageway, those changes’ level has correspondence including weathering level’ change, rock level’ change, rocks’ mechanic parameter’ change on the effect of the weathering on the slop of rivers and valleys. So making use of last several relationship you can have many evaluation on the rocks: structure, weathering type of quality and mechanic parameter.更多还原