紫坪铺水利枢纽工程4#引水隧洞围岩分类(附答辩文稿)

摘 要 围岩分类是基岩地区地下工程的基础研究课题之一。针对影响围岩质量的主要因素，岩石强度、岩体结构、地下水及天然应力状态等，在大量的调查和统计工作基础上，获取常用围岩分类法所需要的指标：岩石饱和抗压强度、RQD值、完整性系数、结构面产状、组数、间距和状态、水文地质条件和地应力状况等。调查结果显示：除RQD值、岩石饱和抗压强度和水文地质条件差异较大外，其他几个工程地质条件差异并不明显。因此，按照工程地质条件的差异，主要是根据RQD值、岩石饱和抗压强度和水文地质条件，再应用工程岩体分类、水电规范、RMR及Q系统四种分类方案对围岩进行评价分类。 关键词：围岩 RQD 工程地质条件 Classification of the 4th Seepage Tunnel’s Wall Rock in ZiPingPu Hydraulic Engineering Abstract Classification of wall rock is one of the basic research subject about underground engineering in the rock foundations. A number of statistics and investigations show what affect the quality of wall rock is strength of rock 、texture of rock mass 、underground water 、virginal stress and so on . In the same time all of the indexes of usual method about classification wall rock such as compression strength of saturated rock, RQD，integrity coefficient, the attitude, shape and property of discontinuities, hydrogeology condition and ground stress can be gained .Investigations indicate that RQD 、compression of saturated rock and underground water exist conspicuous difference in the different sections . But the others engineering conditions are similar .So the tunnel was differentiated base on the difference of RQD 、compression strength of saturated rock and hydrogeology condition. At last four methods about classification wall rock (classification of engineering rock mass, hydroelectric criterion, RMR, Q) are used to estimate the surrounding rock. Keywords: wall rock RQD Engineering geological condition