柱状节理玄武岩的破坏模式、破坏机制及工程对策  

The failure modes,failure mechanisms and countermeasures of columnar jointed basalt rock mass

作　　者：倪绍虎[1,2] 何世海[1] 陈益民[1,2] 潘益斌[1,2] 吕慷[1] 杨飞[1] 郑海圣[1] 

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,浙江杭州310014 [2]浙江省抽水蓄能工程技术研究中心,浙江杭州310014

出　　处：《岩石力学与工程学报》2016年第A01期3064-3075,共12页Chinese Journal of Rock Mechanics and Engineering

基　　金：浙江省自然科学基金资助项目(LY13E090003);国家自然科学基金资助项目(51409265)~~

摘　　要：柱状节理玄武岩是火山岩区所特有的地质现象,其地质成因独特,工程特性、开挖响应特征明显不同于一般常见岩体。通过分析地下洞室中柱状节理岩体的开挖响应特征和揭示现象,结合岩石力学理论和数值分析,对柱状节理玄武岩表现出的典型破坏模式及其破坏机制进行深入分析和总结。在此基础上,针对柱状节理玄武岩卸荷易松弛的特点,结合现场监测、检测数据等信息,总结提炼现场实施过程中有效的支护措施、支护时机、开挖方案、爆破控制等支护手段和施工方法,以有效控制围岩松弛变形和松弛向深部扩展,实现复杂条件下的地下洞室围岩稳定控制。Columnar jointed rock mass is a geological endemism in volcanic rock area with special geological genesis. Its engineering characteristics and excavation responses are obviously different from that of common intact rock mass. In this work, according to the excavation responses and revealed phenomenon of columnar jointed basalt rock mass in tunnel, the typical failure modes and their failure mechanisms of columnar jointed basalt rock mass are studied and summarized, with rock mechanics theoretic analysis and numerical analysis. In addition, based on the unloading and relaxation characteristics of columnar jointed basalt rock mass and in-situ monitoring and test data, the reasonable and feasible support methods and construction methods are discussed and proposed, such as support measurements, support opportunity, excavation scheme, demolish control and so on. These proposed methods are good for controlling columnar jointed rock mass relaxation, deformation and relaxation spreading, so as to enhance the stability under complex geological conditions of underground space such as chamber, house, tunnel and shaft and etc.. The effectiveness and reliability of above-mentioned research results are tested and verified during follow-up tunnel excavation.

关 键 词：岩石力学 地下洞室 柱状节理玄武岩 破坏模式 工程对策 

分 类 号：TU45[建筑科学—岩土工程]