CN-122014153-A - Grouting stopping method for stratum pre-grouting reinforcement

CN122014153ACN 122014153 ACN122014153 ACN 122014153ACN-122014153-A

Abstract

The invention relates to the technical field of geological reinforcement, and discloses a grouting stopping method for stratum pre-grouting reinforcement, which adopts A, B two-component slurry system, wherein component B contains heat stability urease inhibited by reversible inhibitor; the component A contains a corresponding inhibitor scavenger, and the two components are mixed and then are subjected to inhibition and reaction relief to realize controllable extension of the gel time of the slurry and avoid pipeline blockage. The component A is provided with a self-indication and slow-release carrier loaded with copper ions, and after the slurry reaction is started, the ammonium ions of the reaction product are substituted for the copper ions, so that the slurry generates blue change, and a visual basis is provided for judging the injection stopping time. The component A also comprises an energy field response medium and reserved urea encapsulated in the carrier, so that the consolidated body has the capabilities of later non-contact remote control enhancement and micro-crack passive self-repair respectively. The invention realizes safe and controllable grouting process, real-time visualization of reaction state and later regulation of concretion performance.

Inventors

Han Songli
Duo Haoxiang
HUO HAO
TANG JIAWEI
DU BAOLONG
QI DUNXIANG
WANG JUNTAO
WU HAILONG
YANG SHUJUN
GAO JIDONG
LIU KAIYONG
JIANG FENGYU

Assignees

天津新亚太工程建设监理有限公司

Dates

Publication Date: 20260512
Application Date: 20260122

Claims (10)

1. The grouting stopping method for the pre-grouting reinforcement of the stratum is characterized by comprising the following steps of: S1, preparing a component A and a component B, wherein the component A comprises an active precursor, an alkaline excitant, urea, an inhibitor scavenger, an energy field response medium and a multifunctional base stock slurry of a self-indication and slow-release carrier, and the component B comprises a cascade catalytic trigger liquid comprising a heat-stability urease and a reversible competitive inhibitor; S2, after a composite grouting pipe integrated with a front high-pressure rotary water jet nozzle and a rear slurry injection channel is installed in place, in the process that the composite grouting pipe advances at a constant speed, firstly, the high-pressure rotary water jet nozzle at the front end of the composite grouting pipe is used for preprocessing and flushing the wall of a drilling hole, and then the component A and the component B are synchronously injected into the annular space which is just flushed and cleaned through the slurry injection channel at the rear end of the composite grouting pipe, so that continuous operation of flushing and grouting is realized; S3, after the component A and the component B are mixed in the annular space, the inhibitor scavenger reacts with the reversible competitive inhibitor to activate the heat-stability urease, the activated heat-stability urease catalyzes the urea to react, so that the multifunctional base stock slurry is solidified to form a slurry stopping ring, and finally, the rigid solidification of the grouting pipe and the hole wall is realized; S4, stopping injection when the visual color change of the multifunctional base stock slurry flowing back from the orifice is monitored; S5, after the slurry stopping ring is solidified, when the partial weak area is detected, an energy emitter is used for irradiating the partial weak area, so that the energy field responds to a medium to absorb energy and generate partial high temperature, and the high temperature directly drives the active precursor which is not fully reacted in the component A and the alkaline excitant to undergo secondary polymerization reaction, thereby realizing the selective enhancement of the partial weak area.
2. The method for stopping grouting reinforcement of a stratum according to claim 1, wherein the component A comprises the following components in percentage by mass: 3% -8% of urea; 1% -3% of inhibitor scavenger; 1% -5% of energy field response medium; 2% -5% of self-indicating and slow-release carrier; the alkaline activator comprises an active precursor and an alkaline activator, and the mass ratio of the active precursor to the alkaline activator is (1.5-2.5): 1.
3. The method for stopping grouting reinforcement of a stratum according to claim 1, wherein the optimal reaction temperature range of the thermostable urease in the component B is 40-50 ℃, the reversible competitive inhibitor is boric acid, and the inhibitor scavenger in the component A is D-mannitol.
4. A method for stopping a formation pre-grouting reinforcement according to claim 3, wherein in step S3, the inhibitor scavenger reacts with the reversible competitive inhibitor to activate the thermostable urease, specifically, the D-mannitol and the boric acid undergo a complexing reaction to release the inhibition of the thermostable urease by the boric acid.
5. The method for stopping grouting reinforcement of a stratum according to claim 1, wherein the self-indicating and slow-release carrier is a Y-shaped molecular sieve, and reserved urea is packaged in the Y-shaped molecular sieve.
6. The method for stopping a formation pre-grouting reinforcement according to claim 5, wherein copper ions are adsorbed on skeleton sites of the Y-type molecular sieve by ion exchange, and the visual color change in the step S4 is blue, wherein the blue is caused by replacement of the copper ions by ammonium ions generated in the step S3 into the multifunctional base slurry system.
7. The method for stopping grouting reinforcement of a stratum according to claim 5, wherein the self-indicating and slow-release carrier is fixedly provided with the heat-stable urease, the Y-shaped molecular sieve is encapsulated with reserved urea, when the solidified slurry stopping ring generates microcracks, external moisture enters the microcracks and releases the reserved urea from the Y-shaped molecular sieve, and the reserved urea is catalyzed and hydrolyzed by the immobilized heat-stable urease with activity reserved on the carrier, so that the microcracks are plugged and repaired by a product.
8. The method for stopping a formation pre-grouting reinforcement according to claim 1, wherein the energy field response medium in the a component is silicon carbide micro powder, and the energy transmitter in the S5 step is a microwave or radio frequency energy transmitter with a working frequency range of 2.0-3.0 GHz.
9. The method for stopping grouting reinforcement of a stratum according to claim 1, wherein the component A further comprises 0.1-0.5% by mass of a rheology modifier, the active precursor is one or more of metakaolin, fly ash and slag micropowder, and the rheology modifier is xanthan gum.
10. The method for stopping a formation pre-grouting reinforcement according to claim 2, wherein the volume ratio of the B component to the a component is in the range of 1:50 to 1:200.

Description

Grouting stopping method for stratum pre-grouting reinforcement Technical Field The invention relates to the technical field of geological reinforcement, in particular to a grouting stopping method for stratum pre-grouting reinforcement. Background In the stratum pre-grouting reinforcement engineering, such as tunnel excavation, mine construction, dam seepage prevention and the like, a double-liquid grouting technology is generally adopted, and two or more chemical grout components are injected into a target stratum through a grouting pump, so that the two or more chemical grout components react and solidify rapidly at a preset position to form a solidified body with certain strength and seepage resistance, namely a grout stopping ring, so as to achieve the purposes of stabilizing surrounding rock and blocking underground water flow. However, there are several technical limitations in the application of existing two-fluid grouting materials and methods. First, once the slurry components are mixed, their chemical reactions are triggered instantaneously, and the gel curing process is extremely fast, which results in a very short operational window of the slurry. In actual construction, if the slurry is solidified prematurely in the conveying pipeline or before reaching the target area, the grouting pipeline is very easy to be blocked, the construction is not only interrupted, but also equipment is damaged, and the safety risk exists. In addition, the consolidation reaction process of the slurry after injection into the deep portion of the formation is an invisible blind zone. The on-site operator cannot directly know whether the slurry has successfully started the polymerization reaction in the predetermined area and typically can only rely on indirect monitoring of the grouting pressure or empirical time estimation to determine the timing of the injection stop. The lack of such information feedback results in insufficient construction accuracy, which can result in partial area underinjection or overdose, affecting the final reinforcement quality. More importantly, once the slurry is solidified to form a slurry stop ring, the mechanical properties of the slurry are fixed. In the long-term service process, if local weak areas or micro-cracks are generated in the consolidation body due to factors such as geological stress change and the like, the prior art lacks an effective and noninvasive means for carrying out fixed-point reinforcement or damage repair on the consolidation body. This limits the long-term reliability and durability of the consolidated body, and makes it difficult to cope with complex post-geological environmental changes. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a grouting stopping method for stratum pre-grouting reinforcement, which solves the problems that in the existing stratum pre-grouting method, the slurry gel time is difficult to control, the deep reaction state cannot be monitored, and the consolidated body lacks the capability of later performance regulation and self-repairing after formation. In order to achieve the purpose, the invention is realized by the following technical scheme that the grouting stopping method for stratum pre-grouting reinforcement comprises the following steps: S1, preparing a component A and a component B. The component A is multifunctional base stock slurry, and the component B is cascade catalytic trigger liquid. In one embodiment, the a-component comprises an active precursor, an alkaline activator, urea, an inhibitor scavenger, an energy field response medium, and a self-indicating and slow release carrier. The active precursor is one or more of metakaolin, fly ash and slag micropowder. Rheology modifiers may also be included in the a-component. In a specific embodiment, the B component comprises a thermostable urease and a reversible competitive inhibitor. S2, after the orifice pipe and the grouting pipe are installed, high-pressure water flushing synchronous grouting is carried out. And (3) synchronously injecting the component A and the component B prepared in the step (S1) into an annular space between the grouting pipe and the wall of the drilling hole through independent pipelines. And continuously pumping high-pressure water flow into the grouting pipe in the whole injection process of the component A and the component B, wherein the high-pressure water flow is used for flushing the outlet of the grouting pipe, and the smoothness of a grouting channel is maintained. S3, mixing, reacting and solidifying the slurry. After mixing the A-component and the B-component in the annular space, a continuous reaction occurs in which, first, the inhibitor scavenger in the A-component reacts with the reversible competitive inhibitor in the B-component, releasing the inhibition of the thermostable urease by the reversible competitive inhibitor, thereby activating the thermostable urease. Subsequently, the activated