【作者】 孟陆波； 李天斌； 方兴； 何勇；

【Author】 Meng Lubo;Li Tianbin;Fang Xing;He Yong;The State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology;Sichuan Communication Surveying & Design Institute;

【机构】 成都理工大学地质灾害防治与地质环境保护国家重点实验室； 四川省交通运输厅交通勘察设计研究院；

【摘要】 为探讨池家河隧道围岩质量,文章基于隧址区浅表生改造特征和空间发育规律,初步划分了浅表生改造强度等级,建立了适用于池家河隧道地质条件的施工期围岩分级方案,探讨了浅表生改造与隧道围岩级别的关系。结果表明,池家河隧道隧址区岩体经受过较强烈的浅表生改造,主要表现为发育中缓倾角结构面和陡倾角裂隙。浅表生改造控制了池家河隧道岩体结构及围岩级别,浅表生改造强度可划分为强烈、中等和轻微。强烈改造带围岩级别一般为Ⅴ级;中等改造带围岩级别多为Ⅳ级,少部分为Ⅴ级;轻微改造带围岩级别多为Ⅲ级,少部分为Ⅳ级。池家河隧道浅表生中等改造带段落最多,控制了池家河隧道围岩级别。更多还原

【Abstract】 In order to investigate the surrounding rock quality in the Chijiahe tunnel,the strength grade of epigenetic reformation is preliminarily classified,and the surrounding rock classification proposal is applied to the geological conditions of the Chijiahe tunnel.A construction period is established,and the relationship between epigenetic reformation and surrounding rock grades is discussed on the basis of epigenetic reformation characteristics and the spatial development law at the tunnel site.The results show that the rock mass at the Chijiahe tunnel site has suffered strong epigenetic reformation,being mainly characterized by developed lowangle structural planes and steeply dipping fractures.The rock mass structure and grade at the Chijiahe tunnel site are governed by an epigenetic reformation with strengths that can be classified into three levels:strong,medium,and slight.The surrounding rock at the strongly reformed zone is commonly Grade Ⅴ;at the medially reformed zone,most of the rocks are Grade Ⅳ and a few are Grade Ⅴ;and at the slightly reformed zone,most of the rocks are Grade Ⅲ and a few are Grade Ⅳ.The epigenetic reformation zones at the Chijiahe tunnel site,which control of the grades of the surrounding rock,are mostly of the medium level.更多还原