Advanced pre-grouting method for high-pressure water-rich mountain tunnel with soft surrounding rock
A pre-grouting technology for weak surrounding rocks, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of inaccurate evaluation of grouting effects, reduction of grouting effects, and high grouting pressure, etc. The effect of grouting construction cost, reduction of personnel loss, and improvement of safety
Active Publication Date: 2020-04-07
SINOHYDRO ENG BUREAU 4
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Problems solved by technology
[0003] However, in the process of grouting to strengthen the bottom layer, how to control the quality of grouting and the interval between grouting and excavation have not formed a unified standard, and the grouting effect cannot be accurately evaluated, which has become a constraint weakness. A key issue in the excavation of surrounding rocks. For weak surrounding rocks with high water pressure and large water volume, comprehensive curtain grouting is used for advanced pre-grouting. The required grouting pressure is high, and grouting blind spots may appear during grouting, reducing the Grouting effect
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[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0022] see figure 1 , the present invention provides a technical solution: an advanced pre-grouting method for high-pressure water-rich tunnels with weak surrounding rocks. The specific steps of the method are as follows:
[0023] S1: Excavate the upper left half of the single-side wall pilot pit of the mountain tunnel, and implement initial support and lock-foot anchors;
[0024] S2: Excavate the lower left half of the single-side wall pilot pit of the mount...
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The invention discloses an advanced pre-grouting method for a high-pressure water-rich weak surrounding rock mountain tunnel in the technical field of tunnel engineering construction. The method particularly comprises the following steps: S1, the upper left section of a tunnel guide pit is excavated and supported; S2, the lower left section of the tunnel guide pit is excavated and supported; S3, backfilling of riprap concrete is carried out, and after supporting, inverted arch lining is cast; S4, a tunnel arch roof is excavated, and early supporting is carried out; S5, a preventing-grout wallis constructed and is fixed with a tunnel wall through a reinforcing steel bar mesh; S6, an orifice pipe is arranged in a borehole and is fixed through the reinforcing steel bar mesh; S7, a small conduit is used to obliquely and upwardly perform grouting on an excavated contour; and S8, grouting pressure is designed, and grouting cement paste is selected. The grouting problem of the high-pressurewater-rich weak surrounding rock mountain tunnel can be solved, the grouting construction cost is reduced, the construction safety of the high-pressure water-rich weak surrounding rock mountain tunnelis improved at the same time, unnecessary personnel losses are reduced, and the measures are reasonable and safe and controllable.
Description
technical field [0001] The invention discloses an advanced pre-grouting method for a high-pressure water-rich mountain tunnel with weak surrounding rocks, and specifically belongs to the technical field of tunnel engineering construction. Background technique [0002] At present, with the increase of national infrastructure investment and construction, subway projects and mountain tunnel projects are gradually increasing, and a large part of these tunnel projects involve tunnel construction in weak surrounding rocks. The self-supporting ability of the weak surrounding rock is weak, or even has no self-supporting ability. Therefore, the most important thing in the construction of weak surrounding rock is to improve the self-supporting ability of the surrounding rock. As a feasible method of stabilizing the support surface, advance pre-grouting reinforcement of the bottom layer has been widely used in the field of tunnel construction. [0003] However, in the process of grout...
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IPC IPC(8): E21D11/10
CPCE21D11/105
Inventor 吴江涛史静匡伟军候奇林占平李效全刘潼
Owner SINOHYDRO ENG BUREAU 4