强震区成兰铁路某隧道大变形地质成因分析

宋章1,杜宇本1,陶玉敬2,袁传保2

铁道工程学报 ›› 2016, Vol. 33 ›› Issue (10) : 91-94.

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铁道工程学报 ›› 2016, Vol. 33 ›› Issue (10) : 91-94.
隧道工程

强震区成兰铁路某隧道大变形地质成因分析

  • 宋章1,杜宇本1,陶玉敬2,袁传保2
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Analysis of the Geologic Origin of Large Deformation of a Tunnel of Chengdu - Lanzhou Railway in Meizoseismal Areas

  • SONG Zhang1,DU Yu - ben1,TAO Yu - jing2,YUAN Chuan - bao2
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摘要

摘要:研究目的:在建成兰铁路以复杂活跃的地质构造条件、极为显著的地震效应、高水平构造应力场特征及 软弱破碎的地层岩性等复杂的地质条件为其地质背景,强震区软弱破碎围岩隧道大变形现象较为普遍。本文 在现场调绘、试验资料、变形监控量测资料等分析的基础上,从工程地质环境、地层岩性、地质构造、地下水、地 震及应力场等方面,以工程地质的角度,对强震区软弱破碎围岩隧道大变形的成因机制进行分析研究。研究结论:(1)变形段处于汶川“5 ? 12”强震区龙门山前山断裂之彭县-灌县断裂带影响区内,围岩震裂 破碎效应极为显著;(2)大变形主要表现为初支拱顶下沉、边墙侵限开裂、剥落、初支钢架扭曲等破坏特征; 变形工区段受龙门山断裂构造及汶川“5 ? 12”强震震裂影响严重,岩体中节理裂隙发育,变形破坏地质成 因机制可总结为:软弱破碎的围岩条件为大变形产生的物质基础,复杂的高应力场环境为大变形产生的力学 条件,结构面引起的顺层偏压现象和地下水的软化特性等进一步加剧了大变形;(4)变形工区段应加强初支 的监控量测管理,及时进行量测数据的反馈与分析,科学、准确地评价大变形的成因机制;(5)本文的分析方 法及结论对强震区类似工程地质条件下软弱破碎围岩隧道大变形的设计及施工具有借鉴意义。

Abstract

Abstract : Research purposes : Based on the geological background of the complicated geological condition such as the intricate and active tectonic condition,extremely significant seismic effect,high tectonic stress field property,and soft and crushed formation anthology,which is under construction for the Chengdu - Lanzhou railway,the larger deformation phenomenon of tunnel which possessed the characteristic of soft and crushed surrounding rock in meizoseismal areas is relatively common. Based on the analysis of the survey,test data and deformation monitoring data,this article analyzed and researched the genetic mechanism of larger deformation of soft and crushed rock tunnel in meizoseismal areas from several aspects such as the engineering geological condition, formation anthology,tectonic,underground water, earthquake and stress field in engineering geological perspective. Research conclusions :( 1 ) The section of larger deformation is located in the domain of influence of Pengxian - Guanxian fault zone in front of Longmen mountains fault in Wenchuan “ 5. 12" seismic area, with the extremely significant cracked and crushed surrounding rock effect. ! 2" The larger deformation was mainly shown as the deformation failure with the settlement of primary lining crown, splitting, clearance - intrusion and spilling of tunnel side wall, steel torsion and so on. (3) The deformation section was strongly influenced by Longmen mountain fault structure and Wenchuan "5. 12" earthquake, joint fissure of rock mass is developmental, the geologic origin mechanism of larger deformation failure could be summarized that : the soft and cashed surrounding rock was the material basis of larger deformation, the intricate high stress field was the mechanics condition of larger deformation, and the action of the bedding lateral pressure caused by discontinuities and the groundwater softening further heightened larger deformation. We should enhance the management of monitoring measurement of primary lining, feed back and analyze timely the monitoring data of deformation to estimate scientifically and accurately the formation mechanism of larger deformation. (5 ) The analysis methods and conclusions can be widely applied in the survey and construction of the larger deformation of soft and crushed surrounding rock tunnel in similar geological condition in meizoseismal areas.

关键词

关键词:成兰铁路 / 强震区 / 柿子园隧道 / 大变形 / 性状 / 地质成因

Key words

Key words: Chengdu - Lanzhou railway / meizoseismal areas / Shiziyuan tunnel / large deformation / property / geologic origin

引用本文

导出引用
宋章1, 杜宇本1, 陶玉敬2, . 强震区成兰铁路某隧道大变形地质成因分析[J]. 铁道工程学报, 2016, 33(10): 91-94
SONG Zhang1, DU Yu - ben1, TAO Yu - jing2, et al. Analysis of the Geologic Origin of Large Deformation of a Tunnel of Chengdu - Lanzhou Railway in Meizoseismal Areas[J]. Journal of Railway Engineering Society, 2016, 33(10): 91-94

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