【摘要】 蚀变辉绿岩是我国西部地下工程建设中经常遇到的一类不良地质体，对隧洞围岩稳定性带来重大影响。本文在对大渡河硬梁包水电站蚀变辉绿岩引水隧洞开挖过程掌子面前方洞顶塌方统计分析基础上，结合数值模拟手段分析了隧洞围岩稳定性的主要影响因素，并引入物元可拓理论对塌方风险进行评价。研究表明：蚀变辉绿岩隧洞围岩稳定性主要受控于蚀变带性状特征、宽度、地下水状况，在以塌方高度为参量评价塌方程度的前提下，蚀变岩带宽度越大、性状越差、地下水越丰富，围岩稳定性越差，掌子面前方洞顶发生塌方的风险越高；蚀变岩带的出露位置及其两侧花岗岩的性状对围岩稳定性也有一定影响。将定性指标作定量化处理后，选取蚀变岩带宽度、辉绿岩蚀变强度指数、地下水状况、出露位置、围岩花岗岩蚀变强度指数作为评价指标，建立了基于物元可拓理论的塌方风险评价方法，对辉绿岩蚀变带塌方风险进行了评价，计算等级与实际情况符合度较高，可为引水隧洞以及隧洞工程的建设提供理论参考。更多还原

【Abstract】 Altered diabase is a kind of undesirable geological body often encountered in the construction of underground engineering in western China, which has a significant impact on the stability of the surrounding rock of tunnels. In this paper, based on the statistical analysis of the collapse of the tunnel face during the excavation process of the altered diabase diversion tunnel of the Dadu River Yingliangbao Hydropower Station, the main influencing factors of the stability of the altered diabase tunnel surrounding rock were analyzed by numerical simulation methods, and the matter-element extension theory was introduced to evaluate the collapse risk. The results show that the stability of the surrounding rock of the altered diabase tunnel is mainly controlled by the characteristics of the altered rock zone, the width of the alteration zone, and the condition of groundwater. On the premise of evaluating the degree of collapse by the height of collapse, the wider the alteration rock zone, the worse the characteristics, the richer the groundwater, the worse the stability of the surrounding rock, and the higher the risk of collapse in the cave roof in front of the working face. In addition, the outcropping position of the altered rock zone and the characteristics of the granite on both sides also have a certain impact on the stability of the surrounding rock. After the qualitative indexes were quantitatively processed, the width of the altered rock zone, the diabase alteration intensity index, the groundwater condition, the outcropping location and the surrounding rock granite alteration intensity index were selected as the evaluation indexes, and a collapse risk assessment method based on matter-element extension theory was established, and the collapse risk of the diabase alteration zone in the diversion tunnel was evaluated. The calculation grade is highly consistent with the actual situation, which provides theoretical support for the construction of water diversion tunnel and tunnel engineering.更多还原