Tunnel plugging leakage of water seepage remediation way plugging renovation design 1.1 Introduction There is growing recognition by the practice underground concrete projects will be subject to erosion of groundwater, its durability will be affected. Especially in shallow groundwater contamination is more serious, and waterproof concrete anti grade S8 when the permeability coefficient for 5 ~ 8 × 10-8cm / s, therefore, reinforced concrete underground erosion damage is a problem can not be ignored. Waterproof rating of 1,2-class engineering, most important, useful life longer works alone with waterproof concrete to resist the erosion of the effect of groundwater is limited, must be repaired for this treatment, before repair of leaks careful, careful survey. The reason for the leak and location, the development of effective and reasonable technical measures. 1.2 Concrete water leakage severity depends on the crack width and head pressure, head pressure is generally crack width of about 0.1 ~ 0.2mm stationary state when less than 15 ~ 20m, concrete cracks can heal. The phenomenon is, when the concrete produce micro-cracks, a part of the free calcium hydroxide and the concrete body is ever increasing concentration of dissolution, calcium hydroxide into white crystals, calcium hydroxide with atmospheric CO2 carbonation occurs, forming a white carbonate calcium crystal deposition in internal and surface cracks, and finally healed fractures that leakage of water disappears. This feature is based on concrete, waterproof concrete crack width to determine the structure of underground works shall not be greater than 0.2mm, and not through. Most of the cracks are subject to dynamic loading, atmospheric temperature, differential settlement, and the water table level, and other factors will lead to cracks and continue to expand, leading through change and other phenomena. To prevent leakage of water and prevent the concrete structure, requires a combination of on-site leaks surrounding the project site and understand the situation underground engineering, scientific and effective regulation in order to achieve sealing, waterproofing purposes. Second: Pressure grouting plugging plugging procedures tunnel seepage water pressure grouting plugging mechanism 2.1 grouting construction method: the crack to form a closed cavity, are reserved for export control, with special grout slurry hydraulic pump into the gap and make the filling, to waterproof reinforcement purposes. 2.2 perfusion slurry operation process: U-shaped groove along the crack chisel → buried filling mouth, boxes, tubes Sealing → → → preparation of slurry seal check sealing treatment → → → filling examination. 2.3 Filling cracks in the tunnel water leakage plugging plugging procedures are as follows: 2.3.1 Surface treatment: Using gray knife, wire brushes and other tools to remove dust crack surface scum, and other loose debris layer; along both sides of the crack 40 ~ 50mm at the scrub clean. 2.3.2 chiselling U-shaped groove: for cracks on concrete structures, along with the drill rod hewn crack "U" shaped groove, the groove width and depth can be determined based on the depth and conducive Sealing cracks. When gouges first along two edges of the cracks open, again widened on both sides, after cutting with a wire brush or compressed air to remove dust and clean the concrete debris. 2.3.3 buried filling the mouth (box, tube): At the intersection of cracks, wider at the ends and crack penetrations are buried filling mouth (tube or box). Its pitch: for 350 ~ 500mm when the slit width is less than 1mm; when the crack is larger than 1mm, is 500 ~ 1000mm. There must be a crack in the slurry into the mouth, exhaust mouth, a slurry mouth. 2.3.3.1 buried pulp mouth methods: the first crack in the grout dry mouth (box, tube) chassis rubbed 1mm thick layer of epoxy clay. The grout holes straddle the mouth into the slurry at a predetermined position on the stick. 2.3.4. Sealing cracks determined according to the different circumstances and filling requirements. Sealing method which can be divided into:. 2.3.4.1 epoxy mastic sealing seam. For cracks gouges not available epoxy mastic closed. First on both sides of the crack (width 20 ~ 30mm) coated with epoxy-based solution, after wiping a thick about 1mm wide, 20 ~ 30mm of epoxy mastic. Should wipe clay to prevent holes and bubbles, to scrape flat, ensure reliable closure. 2.3.4.2. Quick-setting cement seal micro-expansion joints, have been cutting "U" shaped grooves or cracks with water, tidal temperature, can be directly used quick-setting cement Sealing micro-expansion, the first in-shaped face "U", with a brush, wire brush to remove and clean construction of the base surface, to prevent the adhesive interface is not strong, then blending good clay closed. 2.3.5. Cracks were closed after pressure gas leak, check the sealing effect. After leak testing needed to be sealed seam of clay, when there is a certain strength. Before the leak, coated with a layer of soapy water along the crack, from filling the mouth pass into the air, where the leak, he shall repair the seal does not leak to the upper. 2.3.6. The slurry configured according to the recipe and configuration methods were different grout slurry configure the number one need to doubt the slurry and slurry into a solid time to determine speed. 2.4 grout is one of the key process of construction, to ensure the quality of grouting; 2.4.1 tested, but also understand the possible leakage of plasma, running pulp area, in order to take appropriate measures, and therefore is a very important step in the construction of grouting. 2.4.2 slurry grouting pressure is diffused in the cracks, filling, compaction, power of dehydration. Filling pressure is too low, the slurry can not fill the cracks, diffusion range is limited, the quality is poor grouting. Pressure is too high, even more than a certain limit, it will cause cracks to expand. 2.5 tunnel seepage water plugging cracks grouting points: 2.5.1 should ride stick buried tank filling mouth, along the crack open "U" shaped groove when necessary. 2.5.2 crack should have at least one hole into the pulp, and a vent. 2.5.3. Filling mouth and filling tube should be located at the intersection of cracks wider Department and throughout other parts. Seal for sealing joints should be checked. 2.5.4 Low-voltage low-grouting, chemical grouting pressure is preferably 0.2-0.4mpa, superfine cement grouting pressure is preferably 0.4-0.8mpa. 2.5.5 After the initial setting grout slurry to be sewn inside, before filling the mouth and removed the seal smooth. 2.5.6. Grouting equipment and pipes should be checked prior to filling. Use only normal. Connected to the line, filling his mouth open all the valves, blown clean with compressed air plasma channels and cracks. 2.5.7. According to the size of the crack area, can be single-hole hole filling grout or partition group. Filling can be end to end on a crack. Tunnel plugging leakage of water remediation methods 

keywords: Tunnel plugging leakage of water remediation methods,