桃花江核电厂进厂道路洞冲里隧道塌方处理方法

Collapse Treatment of Dongchongli Tunnel on Access Road to Taohuajiang Nuclear Power Station

洞冲里隧道进口端主要特点是大断面、浅埋、偏压大,工程地质情况为砂质板岩夹变质砂岩,岩层倾向变化较大,岩石节理裂隙发育,有碎裂风化及韧性变形现象。在对隧道塌方产生的内外原因进行分析的基础上,详细描述大断面隧道在偏压作用下发生塌方时的处理方法的选取原则和施工工艺的实施过程;另外通过对处理效果进行分析,总结在处理过程中得出的体会,对类似的隧道塌方处理有重要的借鉴作用。

The portal section of Dongchongli tunnel has the characteristics of large cross-section,shallow cover and severe asymmetrical loading.The major features of the geological conditions along the tunnel include sandy slate containing metamorphic sandstone,severe variation of strata inclinations,development of rock joint and crack,weathered and fractured rock and ductile deformation.Analysis is made on the causes for the tunnel collapse,and the principle for the selection of the collapse treatment methods and the collapse treatment technologies are presented in detail in this paper.In addition,the experience obtained from the collapse treatment is summarized on basis of analysis on the collapse treatment results.The paper can provide significant references for similar tunnel collapse treatment in the future.