Experimental research on remediation for tunnel seepage on Shimen-Jishou section of Jiaozuo-Liuzhou railway

1 Overview
2 Application status of drainage method by chiseling groove and burying pipe
3 Simulation test of drainage method by chiseling groove and burying pipe
3.1 Test apparatus and operation principle
3.2 Fabrication of sample and process of test
3.3 Result and analysis of test
4 Test with scanning electron microscope
5 Conclusions
 

Experimental research on remediation for tunnel seepage on Shimen-Jishou section of Jiaozuo-Liuzhou railway

RUAN Bo1 ，RUAN Xiang-Ju1 ，XU Ming-Gen2
(1．School of Civil Engineering and Architecture，Central South University，Changsha 410075，Hunan；
2．China Railway 25th Bureau Group Co., Ltd.，Guangzhou 510600，Guangdong)

Abstract：The indoor simulation test of drainage method by chiseling groove and burying pipe was implemented; this method was applied to remediation for tunnel seepage on Shimen-Jishou section of Jiaozuo-Liuzhou railway. The impervious performance of this method was studied. Waterproofing mechanism of CN2000B coating was researched with Scanning Electron Microscopy (SEM). The test results showed, the waterproofing coating had the characteristic of capillary crystalline and self-healing. After the coating was brushed on the surface of mortar, the impermeability pressure may reach 0.9 MPa at the age of 28 d, and the impermeability pressure ratio can reach 450％. However, the depth of the groove had no obvious effect on the impermeability pressure. These research results can be used for reference to remediation for seepage on existing operational tunne1 henceforth.
Key words：railway tunnel；remediation for the seepage；simulation test；drainage by chiseling groove；CN2000B type waterproof coating；capillary crystalline；SEM (Scanning Electron Microscope)

1 Overview
　　The problem of leakage water is a common quality failing for tunnel and underground engineering nowadays. It is also one of the tough problems for a long time to the related departments[1]. By the end of 1998, there are more than 5,000 running railway tunnels in China, over 2,500km; about 70% of tunnels have damage by water[2]. Shimen-Jishou section of Jiaozuo-Liuzhou railway with length of 254.4km has 129 existing operational tunnels with total length of...