CN-116357350-B - Systematic full-section grouting water plugging construction method for low-pressure water-rich tunnel

CN116357350BCN 116357350 BCN116357350 BCN 116357350BCN-116357350-B

Abstract

The invention discloses a systematic full-section grouting water plugging construction method for a low-pressure water-rich tunnel, which comprises the following steps of S10, judging that a water seepage position in the tunnel is a paragraph type non-high-pressure water-rich jing-seepage mixing field in a TBM tunneling process, S20, continuing to advance and drive through water seepage positions, S30, respectively circumferentially drilling a plurality of grouting holes and drainage holes at each section of the tunnel water seepage positions along longitudinal intervals, and S40, after grouting water plugging of each section is completed, observing grouting holes and drainage holes of each section, and checking and analyzing grouting water plugging effects. According to the construction method, through the full-plugging grouting operation of the water seepage point position, slurry is driven to diffuse and supplement microcracks of surrounding rock and plug the diameter-seepage path, so that the water-proof property of the surrounding rock is improved, the distribution of a seepage-runoff mixed field is changed, the water seepage can be quickly and effectively plugged in the TBM tunneling process, the influence on TBM tunneling is small, and the site construction is convenient and quick.

Inventors

WANG LICHUAN
WU JIAN
ZHANG SHUAI
LI LIPING
BAI TAO
ZHANG JINGJING
ZHAO BAOJUN
HU HENGQIAN

Assignees

中铁十八局集团有限公司

Dates

Publication Date: 20260505
Application Date: 20230425

Claims (10)

1. A systematic full-section grouting water plugging construction method of a low-pressure water-rich tunnel is used for rapidly and effectively plugging water seepage in a TBM tunneling process and is characterized by comprising the following steps: S10, in the TBM tunneling process, judging that a seepage water position in a tunnel is a paragraph type non-high-pressure water-rich jing-seepage mixing field; s20, draining water to the inner accumulated water of the tunnel to descend after the water seepage occurs, and enabling the TBM to continuously advance and drive through the water seepage point; S30, respectively circumferentially drilling a plurality of grouting holes and drainage holes at each section of the tunnel water seepage point along the longitudinal interval, wherein each grouting hole comprises an I sequence hole and a II sequence hole which are circumferentially arranged at intervals, the aperture of the I sequence hole is larger than that of the II sequence hole, the depth of the I sequence hole is larger than that of the II sequence hole, the drainage holes are arranged below a horizontal radial line, and the slurry is used for fully plugging the water seepage point according to the following steps: S301, grouting and plugging water to the I sequence holes and the II sequence holes of the tunnel top and the side wall respectively, wherein grouting is not performed at the position of the exhaust cylinder; S302, grouting and plugging water to the I sequence holes and the II sequence holes of the bottom plate respectively until the grouting holes are completely plugged; S303, performing supplementary grouting and water shutoff on the rest non-grouting parts; The grouting sequence is longitudinal from two ends to the middle, radial from top to bottom, each section firstly grouting an I sequence hole, then grouting an II sequence hole, grouting the same section from top to bottom, grouting pressure of the II sequence hole is larger than that of the I sequence hole, when the grouting section does not perform grouting any more under the maximum test design pressure, and grouting is finished; S40, after grouting and water shutoff of each section are completed, grouting holes and water discharge holes of each section are observed, and grouting and water shutoff effects are checked and analyzed.
2. The method for water shutoff construction of systematic full section grouting of a low pressure water-rich tunnel according to claim 1, wherein in grouting process of a section, grouting of each I-order hole is finished from top to bottom, grouting of each II-order hole is finished from top to bottom, grouting of each I-order hole at the top is finished first in grouting process of each I-order hole, grouting of each I-order hole at two symmetrical sides is finished finally, grouting of each II-order hole is finished from top to bottom, grouting of each II-order hole at the top is finished first in grouting process of each II-order hole is finished, grouting of each II-order hole at two symmetrical sides is finished, and grouting of each II-order hole at the bottom is finished finally.
3. The method for constructing the systemic full section grouting water plugging of the low pressure water-rich tunnel according to claim 1 or 2, wherein after the I sequence holes and the II sequence holes are drilled, the outer ends of the I sequence holes and the II sequence holes are connected with one-way valves, the one-way valves only allow liquid to flow inwards from outside, prohibit the liquid from flowing inwards to outside, and after grouting, after the slurry in the holes is solidified, the one-way valves are removed.
4. The method for constructing the systemic full face grouting water plugging of the low pressure water rich tunnel according to claim 1 or 2, wherein at least one of the measures of flow restriction, pressure restriction, limiting quantity, intermittent or grouting is used when the injection quantity of the grouting section is large and difficult to end.
5. The method for constructing the systemic full face grouting water plugging of the low pressure water-rich tunnel according to claim 1 or 2, wherein when the grouting is carried out on a plurality of adjacent grouting holes in series, the grouting equipment is used for synchronously grouting the adjacent grouting holes or sealing grouting plug valves in communication holes.
6. The method for constructing the systematic full-section grouting water plugging of the low-pressure water-rich tunnel according to claim 1 is characterized in that the length of a grouting section, grouting pressure, grouting concentration or whether an accelerator is added is determined according to the water seepage pressure and the water seepage quantity before grouting.
7. The method for constructing the systematic full-section grouting water plugging of the low-pressure water-rich tunnel according to claim 1, wherein the slurry is a composition of cement slurry and water glass, the mixing ratio is water glass Baume 30Be ́, the water cement ratio is 0.6-0.7:1, the volume ratio of the cement slurry to the water glass is 1:1, and the slurry gel time is 30s.
8. The method for constructing the systemic full section grouting water plugging of the low pressure water-rich tunnel according to claim 1, wherein whether the water-rich position in the tunnel is a paragraph type non-high pressure water-rich jing-seepage mixing field is judged according to the fracture structure, the water-rich amount and the mixed state of the seepage field and the radial flow field at the water-rich position in the tunnel.
9. The method for constructing the systemic full face grouting water plugging of the low pressure water-rich tunnel according to claim 8, wherein the method is characterized in that in the TBM tunneling process, the fracture structure and the water seepage state of the tunnel are observed, and when the water seepage amount continuously increases and the water seepage field and the jing flow field exist, the method is judged to be a paragraph type non-high pressure water-rich jing-water seepage mixing field.
10. The method for systematic full-face grouting water shutoff construction of the low-pressure water-rich tunnel according to claim 1, which is characterized in that: s301, before and after grouting is completed, monitoring and comparing the seepage water inflow quantity a1 before grouting blocking, the seepage water inflow quantity a2 after grouting blocking and the seepage water inflow state; S302, before and after grouting is completed, monitoring the seepage water inflow a2 before grouting, the seepage water inflow a3 after grouting and the seepage water inflow area, until local water dripping and a small amount of linear running water become local water dripping and seepage in the range of the exhaust cylinder; And S303, before and after grouting is completed, intermittently grouting partial special parts, and monitoring the seepage water inflow quantity a3 before comparative grouting and the seepage water inflow quantity a4 after grouting until no seepage water inflow exists after grouting.

Description

Systematic full-section grouting water plugging construction method for low-pressure water-rich tunnel Technical Field The invention relates to the technical field of tunnel water shutoff, and particularly provides a systematic full-section grouting water shutoff construction method for a low-pressure water-rich tunnel. Background The mountain river in China is numerous, the geological condition encountered in the construction process of the TBM method is complex and changeable, the TBM reveals (passes through) the water-rich cracks, the water quantity leaked (oozed and gushed) in the tunnel is increased in a nonlinear manner, and the safety of huge personnel and TBM heading machines is greatly influenced. The tunnel can induce a water leakage phenomenon when penetrating through a water-rich fracture stratum, and underground water needs to be treated in order to ensure the safety and convenience of construction, and the main treatment thought at present is drainage and water shutoff. The water pressure can be effectively reduced by water blocking or drainage through the structure, but the ecology can be destroyed by excessive drainage. Aiming at the problem of overlarge water discharge capacity, if a partial single-point polyurethane foaming grouting method is adopted, only the water outlet path can be changed, and the water discharge capacity is not changed obviously. In addition, aiming at the water plugging construction of a paragraph type non-high-pressure water-rich-seepage mixing field with a longer distance, no adaptive water plugging method exists at present, the construction randomness is larger, and the problems of low water plugging efficiency and poor effect are caused. Therefore, the research section type low-pressure water-rich fracture stratum full-section grouting water plugging method is needed to be used for effectively and rapidly treating gushing water in the TBM construction process and has important significance for guaranteeing construction safety. Disclosure of Invention Based on the method, the invention provides a systematic full-section grouting water plugging construction method for a low-pressure water-rich tunnel, which is used for standardizing the water plugging construction of the tunnel of a paragraph type non-high-pressure water-rich-seepage mixing field, and improving the water plugging efficiency and the water plugging effect. In order to achieve the purpose, the technical scheme of the invention is that the construction method for the systematic full-section grouting water shutoff of the low-pressure water-rich tunnel is used for quickly and effectively shutoff of seepage water in the TBM tunneling process and comprises the following steps: S10, in the TBM tunneling process, judging that a seepage water position in a tunnel is a paragraph type non-high-pressure water-rich jing-seepage mixing field; s20, draining water to the inner accumulated water of the tunnel to descend after the water seepage occurs, and enabling the TBM to continuously advance and drive through the water seepage point; S30, respectively circumferentially drilling a plurality of grouting holes and drainage holes at each section of the tunnel water seepage point along the longitudinal interval, wherein each grouting hole comprises an I sequence hole and a II sequence hole which are circumferentially arranged at intervals, the aperture of the I sequence hole is larger than that of the II sequence hole, the depth of the I sequence hole is larger than that of the II sequence hole, the drainage holes are arranged below a horizontal radial line, and the slurry is used for fully plugging the water seepage point according to the following steps: S301, grouting and plugging water to the I sequence holes and the II sequence holes of the tunnel top and the side wall respectively, wherein grouting is not performed at the position of the exhaust cylinder; S302, grouting and plugging water to the I sequence holes and the II sequence holes of the bottom plate respectively until the grouting holes are completely plugged; s303, performing supplementary grouting and water shutoff on residual non-grouting parts such as the position of the air duct, the matched position behind the TBM and the like; The grouting sequence is longitudinal from two ends to the middle, radial from top to bottom, each section firstly grouting an I sequence hole, then grouting an II sequence hole, grouting the same section from top to bottom, grouting pressure of the II sequence hole is larger than that of the I sequence hole, when the grouting section does not perform grouting any more under the maximum test design pressure, and grouting is finished; S40, after grouting and water shutoff of each section are completed, grouting holes and water discharge holes of each section are observed, and grouting and water shutoff effects are checked and analyzed. Optionally, in the grouting process of a section, grouting of each I-sequence hole is finis