地下厂房洞室群开挖过程中的工程地质问题  

Study of engineering geological problems in excavation of underground powerhouse cavern group

作　　者：许努谦 王金生[1] 李清和[1] 

机构地区：[1]中国水电顾问集团成都勘测设计研究院,四川成都610072

出　　处：《人民长江》2014年第8期85-88,共4页Yangtze River

摘　　要：猴子岩地下厂房洞室群位于高地应力区,围岩强度相对较低。在地下洞室群开挖过程中,出现喷层开裂与围岩表层剥落、掉块、坍塌等现象。现场勘测表明,围岩变形、锚杆锚索应力、围岩松弛深度及范围均较大。根据地下洞室群工程地质条件,对围岩进行了分类,分析了围岩变形产生的原因。据此有针对性地实施了局部加强支护,包括适度加密系统锚杆和锚索、降低锚索锁定吨位、对主厂房Ⅳ类围岩采用较高密度的锚杆以及锚索、灌浆和钢筋混凝土修补等处理措施,以提高岩体抗破坏能力,保障围岩稳定。The underground powerhouse cavern group of Houziyan Hydropower Station is located in high ground stress area and the strength of the surrounding rock is relatively low. In the excavation of underground powerhouse cavern group, the phenomena such as shotcrete layer cracking and surrounding rock surface peeling, block-falling and collapse were existed. The field investi-gation showed that the deformation of surrounding rock and stress of anchor cable and bolt were large, so were the stress relaxation depth and scope of surrounding rock. The geological condition of underground powerhouse cavern group was studied, the sur-rounding rock of the underground cavern was classified and the causes for surrounding rock deformation were analyzed. The local reinforced support was carried out, including increasing the bolts and anchor cables system, lowering the locked tonnage of an-chor cable and repairing IV surrounding rock with high-density bolt and anchor cable, grouting and reinforced concrete, so as to ensure the stability of surrounding rock.

关 键 词：结构面 围岩稳定 高地应力 地下洞室群 

分 类 号：P642[天文地球—工程地质学]