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A grouting reinforcement and grouting technology, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of surrounding buildings and surface settlement, grouting blind spots, tunnel water leakage, etc., so as to improve work efficiency and reduce construction costs , The effect of reducing the risk of water leakage
Inactive Publication Date: 2019-03-08
ERCHU CO LTD OF CHINA RAILWAY TUNNEL GRP
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Problems solved by technology
However, when the existing grouting methods and grout are applied to weak and broken surrounding rocks and water-rich areas, it is easy to generate grouting blind spots, resulting in the risk of settlement of surrounding buildings and the ground surface, and there may be a risk of water leakage in the later tunnel
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Embodiment 1
[0049] The slurry of the outer ring includes rapid-hardening sulfoaluminate cement, bentonite and water, wherein the water-cement ratio is 0.8, and the mass ratio of cement to bentonite is 1:0.15.
[0050]It has been verified that the consistency of the outer ring slurry is thinner than that of cement slurry with a water-cement ratio of 0.8, the gel time is greater than 1min, the strength is soft in 1 hour (1h), the calculus rate is 95%, and the bleeding rate is 12%.
Embodiment 2
[0052] The slurry of the outer ring includes rapid-hardening sulfoaluminate cement, bentonite and water, wherein the water-cement ratio is 1.0, and the mass ratio of cement to bentonite is 1:0.15.
[0053] It has been verified that the consistency of the outer ring slurry is thinner than that of cement slurry with a water-cement ratio of 1.0, the gel time is longer than 1min, the strength is hard in 1 hour (1h), the calculus rate is 85%, and the bleeding rate is 35%.
Embodiment 3
[0062] The inner ring slurry includes ordinary Portland cement, anhydrous calcium chloride, water glass and water, wherein the water-cement ratio is 0.8, the mass ratio of cement to anhydrous calcium chloride is 1:0.2, and the ratio of cement slurry to water glass The volume ratio is 1:1, and the water glass concentration is 25 degrees Baume.
[0063] It has been verified that the consistency of the grout in the inner ring is thinner than that of cement grout with a water-cement ratio of 0.8, the gel time is longer than 1h, the strength is soft after 1h, the calculus rate is 88%, and the bleeding rate is 12%.
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Abstract
The invention provides a grouting method for tunnel grouting reinforcement. The grouting method comprises the steps that a grouting-stop wall is constructed on a tunnel face; a plurality of grouting holes are drilled in the grouting-stop wall, borehole orifice pipes are correspondingly mounted in the grouting holes, and the multiple grouting holes comprise a plurality of outer ring drilled holes and a plurality of inner ring driller holes, the extending directions of the inner ring driller holes are parallel to the horizontal direction, the extending directions of at least parts of the outer ring drilled holes are inclined to the horizontal direction, and at least parts of the outer ring drilled holes extend to the outer sides of a preset excavation contour; and slurry is injected into thegrouting holes. According to the grouting method, the outer ring drilled holes and the inner ring driller holes can be grouted respectively, grouting blind areas can be avoided, and thus a soil bodyis effectively reinforced.
Description
technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a grouting method for tunnel grouting reinforcement. Background technique [0002] During tunnel excavation, it is necessary to drill holes in the form of minimal disturbance to the soil in front, and use high-pressure grouting to force out the water existing between the rock formation particles, so that the gaps between the particles are filled with slurry and solidified, To achieve the purpose of changing the surrounding rock, the characteristics of the slurry are to increase the cohesive force of the surrounding rock stratum, the value of the internal friction angle, the cohesive strength of the formation and the compactness, and play a role in reinforcement. After the particle gaps are filled with stagnant and consolidated grout, the water permeability of the soil layer is reduced, and an underground continuous grouting protection body with certain strength and wa...
Claims
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