Method for strengthening loose pebble formation with loess-cement mixed slurry
A technology of mixing slurry and cement, which is applied in earth drilling, soil protection, construction, etc. It can solve the problems of high engineering cost, high stratum cost, slurry loss and waste, etc., and achieves reduced engineering cost, low price, and convenient material acquisition Effect
Active Publication Date: 2020-05-05
SHANGHAI TUNNEL ENG CO LTD +1
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the defects of the prior art, to provide a method for reinforcing loose pebble formations with loess cement mixed mud, to solve the problem of uncontrollable grouting range in existing reinforcement grout, serious loss and waste of grout, and inability to form a consolidated body. Failure to achieve the purpose of strengthening and stabilizing the formation, high cost, high engineering costs, etc.
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[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0029] refer to figure 1 , the present invention provides a method for reinforcing loose pebble formations with loess cement mixed slurry, which can strengthen the loose pebble formations, increase the integrity of the formation and the overall structural strength, thereby improving the quality and speed of shield tunneling and reducing the occurrence of tunneling accidents probability. The loess cement mixed slurry of the present invention has a controllable diffusion radius in the loose pebble formation, and can effectively fill the space between the pebbles; the final strength of the slurry after final setting is between 0.3MPa and 0.8MPa, which can effectively strengthen the formation without causing any damage due to strength. If it is too large, it will adversely affect the shield tunneling construction. The material for the slurry conf...
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The invention relates to a method for reinforcing a loose pebble stratum through loess and cement mixed slurry. The method comprises the following steps that drilling is conducted on the two sides ofa set reinforced area to form curtain holes, and grouting pipes are mounted in the curtain holes; drilling is conducted evenly in rows in the position, between the two rows of curtain holes, in the reinforced area to form reinforcing holes, and grouting pipes are mounted in the reinforcing holes; cement, loess and water are mixed with the mass ration being 1:4:0.57 to form the loess and cement mixed slurry; the loess and cement mixed slurry is injected into the grouting pipes in the curtain holes to reinforce the loose pebble stratum; and the loess and cement mixed slurry is injected into thegrouting pipes in the reinforcing holes to reinforce the loose pebble stratum, and thus the loose pebble stratum in the reinforced area is reinforced. The stratum can be effectively solidified, the adverse effect on shield propulsion construction due to the excessive strength is avoided, the material price is low, and thus the project cost is effectively reduced.
Description
technical field [0001] The invention relates to the field of soil layer reinforcement construction, in particular to a method for reinforcing loose pebble strata with loess cement mixed slurry. Background technique [0002] There are many large-scale pebble waste backfill areas in the surrounding areas of Urumqi. The soil quality of the fill soil is mostly a mixture of pebbles with a particle size greater than 60mm and construction waste. The structure is loose and uneven, and the physical and mechanical properties are quite different. The porosity is as high as 40%. Due to the large difference in particle size and soil uniformity during shield tunneling construction, it is easy to cause engineering accidents and failures such as stratum collapse, shield cutterhead jamming, and screw conveyor jamming. [0003] At present, the commonly used formation reinforcement slurries in the prior art, such as pure cement slurries, cement-water glass slurries, ultra-fine cement slurries...
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IPC IPC(8): E21D9/00E21D9/08E02D3/12E02D15/04
CPCE02D3/12E02D15/04E21D9/002E21D9/08
Inventor 施军卓发成黄德中张亮李刚李万林黄俊寇晓勇范杰陈培新
Owner SHANGHAI TUNNEL ENG CO LTD