[1]孙雁军,阳军生,张箭,等.风化花岗岩地层隧道衬砌裂损分析与处理研究[J].郑州大学学报(工学版),2017,38(04):78-83.[doi:10.13705/j.issn.1671-6833.2017.01.013]
　Sun Yanjun,Yang Junsheng,Zhang Jian,et al.The effect of weathered granites on the highway tunnel lining[J].Journal of Zhengzhou University (Engineering Science),2017,38(04):78-83.[doi:10.13705/j.issn.1671-6833.2017.01.013]
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风化花岗岩地层隧道衬砌裂损分析与处理研究()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
38
期数:
2017年04期
页码:
78-83
栏目:
出版日期:
2017-07-18

文章信息/Info

Title:
The effect of weathered granites on the highway tunnel lining
作者:
孙雁军; 阳军生; 张箭; 王树英
1.中南大学土木工程学院,湖南长沙410075;2.湖南省高速公路建设开发有限公司,湖南长沙410001
Author(s):
Sun Yanjun1; Yang Junsheng2; Zhang Jian2; Wang Shuying2
1. School of Civil Engineering, Central South University, Changsha, Hunan 410075; 2. Hunan Expressway Construction and Development Co., Ltd., Changsha, Hunan 410001
关键词:
Keywords:
DOI:
10.13705/j.issn.1671-6833.2017.01.013
文献标志码:
A
摘要:
围岩风化不仅能改变围岩的矿物成分,而且能降低其强度,使得作用于衬砌结构上的围岩压力加大,导致衬砌开裂,甚至发生破坏.新家洞隧道穿越地层为花岗岩地层,开挖后围岩稳定性好,按Ⅱ级围岩支护.但隧道建成2 a后,隧道衬砌结构出现严重裂损.为了研究衬砌结构开裂原因,采用试验手段对裂缝周边混凝土强度及花岗岩的物相成分、力学性质等进行测试.测试结果表明,围岩风化、强度降低是导致衬砌开裂的主要原因.最后,利用有限元反分析法确定围岩物理力学参数,并基于此对整治后隧道结构安全性进行评价,从数值模拟结果和现场实施效果看,衬砌结构满足强度要求.研究成果对类似地层中隧道设计与施工具有参考意义.
Abstract:
Weathering action will not only change the mineral composition of rocks,but also cause significant reduction of rock material strength.As the surrounding rock pressure acting on the lining increases,lining cracks could be developed gradually,and lining destruction even occurs if the cracks are not disposed in time.It could bring adverse effect to the tunnel operation safety.In this paper a case history of the highway tunnel which located in weathered granite was presented.The stability of surrounding rock for the XJD tunnel was relatively good and the linings were constructed according to Ⅱ-class tunnel lining design during the excavation process.However,the lining cracks appeared after the tunnel had been established.To analyze the reason,some experiments on the physical and mechanical properties of granites with different weathering degrees had been done through core sampling drilling.The mineral compositions of granites were studied using fully automatic X-ray diffractometer,and rock material strengths were also tested.The mechanical properties of lining for the tunnel buried in granites with different weathering degrees were also analyzed by using numerical simulation method.The result comparison between the numerical simulations and experiments showed that the weathering of granite was the main reason to cause the lining cracks.At last,some corresponding treatment measures for the problem were proposed,which could be used as a reference for the similar projects.
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