(China Railway Twenty-Five Bureau Group Co., Ltd., Guangzhou 510600) Grouting, brushing cementitious infiltrated crystalline waterproofing materials, anchor grouting reinforced linings, etc. Tunnel seepage water remediation method and construction technology. Waterproof Materials 1 Overview The Xizizi tunnel is located at K1028 030+518 on the Jiaoliu line. The total length of 1623m bedrock is shale and shaly sandstone, and structural fissure water develops. Since its establishment in the early 1970s, the public works department has repeatedly devoted human and material resources to leaking and rectifying the tunnel, with little success. The characteristics of this tunnel leakage are: multiple leaking parts, complex leakage causes, poor operating conditions for disease remediation, and many unsafe factors. The leakage of the tunnel arch partially forms a line flow, and the karst water droplets in the dome condense to form stalactite, which seriously jeopardizes the driving safety. 2 Principles and Methods for Tunnel Leakage Remediation Tunnel leakage is the result of the gradual penetration of water pressure on the crevices, and the water pressure is transmitted by the external water source through the water pressure accumulated in the gaps. According to the analysis of the causes of the tunnel leakage, it was decided to adopt the rectification principle of “mainly by blocking arches, lining walls first, and row and plugging together†to adopt lining wall post grouting, chisel grouting, drainage, cement-based Penetration crystalline waterproof coating impermeability, grouting anchor reinforcement lining and other four kinds of complete collection Date: 2005 - Measurement results: After the initial support after the surrounding rock surrounding the maximum displacement value of 3mm12d after only 0.02; The maximum value of the dome is 5mm on the 6th day before it sinks, and it is only 0.3mm after 12d. The measurement results show that this excavation method is successful. Through this attempt, not only construction safety has been ensured, but also the phenomenon of stress concentration and collapse of the work surface has been eliminated, and through the application of new technologies such as tunnel energy saving and environmental protection hydraulic blasting and prestressed grouting bolts, the deformation of surrounding rocks has been effective. The control ensures the permanent safety of the tunnel structure. 4 Conclusion With the continuous increase of railways, highways and large cross-section tunnels, its construction techniques. For serious cracked seepage water caused by loosening, voids, and catchment of the surrounding rock of the lining wall, especially for single-line lining leaking water, the special grout is injected into the lining wall to reinforce and compact the surrounding water. Rocks, block cracks and treat water. The practice is as follows (). °\Beginning of the grouting hole plane of the lining wall of the beer arch line (unit: cm) In the area where the arch lining leaks a large area of ​​water, a 45-50mm hole is drilled with a pneumatic drill, and the hole is drilled after 200mm drilling into the rock. , 42mm horse teeth buttoned grouting pipe is buried, the pipe exposed length is 150mm and the hole circumference is closed with plastic mud.The spacing of the grouting hole is 3m (longitudinal) X2m (circumferential), and the quincunx arrangement is adopted. Before the grouting, water injection test should be carried out. The stopwatch records the injection and discharge times, and determines the grouting amount, grouting pressure, and the operation of the inspection pipeline equipment.The grouting machine is equipped with an electric reciprocating pump or a hand-pump, etc., depending on the type of grouting fluid and the size of the leakage area. The grouting material adopts pure cement slurry and cement mortar for the general water infiltration section, and cement-water glass double slurry for the water-rich and water inflow sections, and the water-cement ratio is 1:1: the volume ratio of cement slurry to water glass is 1: 0.75 water glass concentration is 35Be, '42.5 ordinary portland cement, initial pressure of grouting is 0.1 5MPa, when cement mortar is used, the gel time of pure cement slurry is more than 5min, the accelerator may be properly added, and the grouting pressure reaches The design final pressure technique has been the majority of tunnel applications. The subject of the study, through the attempt to excavate large sections of the tunnel back to the driveway, has accumulated a method for the excavation of large-section tunnels, which has been summarized as the “pass through the middle hole and the two-step enlarging method.†Practice has proved this method. 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