摘要
现行规范中一般黏性土、砂类土、黄土隧道围岩分级均以定性描述来确定;膨胀土隧道围岩分级方法没有纳入规范;岩溶隧道、高水压隧道、大跨度隧道围岩级别划分缺乏修正方法。从围岩稳定性角度出发,一般黏性土、砂类土、黄土隧道除定性描述外,还应寻求其他定量指标进行定量划分;膨胀土寻求能反映土体强度、膨胀特性的代表性指标是今后围岩分级定性与定量化研究的方向,以期将这种特殊围岩纳入规范;岩溶隧道、高水压隧道、大跨度隧道应总结施工案例,吸收其他行业成功经验,建立围岩级别修正方法,并纳入规范。
At present,classifications of tunnel surrounding rock with general cohesive soil,sand soil and loess are determined by qualitative indexes in current design standards,but the classification methods of expansive soil tunnel is not yet included and there are lack of modification methods for the surrounding rock classifications of karst tunnel,high water pressure tunnel,long-span tunnel.The paper thinks: in light of the stability of surrounding rock,other quantitative indexes in addition to qualitative indexes should be used to class tunnel surrounding rock of general cohesive soil,sand soil and loess.The representative indexes which can reflect the strength of soils and expansion characteristics should be included in design standards in classification of expansive soil tunnel surrounding rock.The modification methods of surrounding rock classification for karst tunnel,high water pressure tunnel,long-span tunnel should be established and be included in design standards by summarizing construction cases and absorbing the successful experiences in other industries.
出处
《铁道标准设计》
北大核心
2012年第9期77-80,共4页
Railway Standard Design
关键词
铁路隧道
稳定性
围岩分级
railway tunnel
stability
surrounding rock classification
