CN112943266A - Method for reinforcing water-rich sand layer with high-flow-rate underground water through high-pressure rotary jet grouting - Google Patents
Method for reinforcing water-rich sand layer with high-flow-rate underground water through high-pressure rotary jet grouting Download PDFInfo
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- CN112943266A CN112943266A CN202110275672.3A CN202110275672A CN112943266A CN 112943266 A CN112943266 A CN 112943266A CN 202110275672 A CN202110275672 A CN 202110275672A CN 112943266 A CN112943266 A CN 112943266A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
- E21D9/002—Injection methods characterised by the chemical composition used
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
Abstract
The invention discloses a method for reinforcing a water-rich sand layer with high flow rate underground water by high-pressure rotary spraying grouting, which comprises the following steps: surveying the water-rich sand layer, and determining the drilling position of the high-pressure jet grouting pile machine; aligning a drill bit of the high-pressure rotary jet pile machine to the center of a hole site, and simultaneously preparing polyurethane-water glass slurry and cement-water glass slurry; drilling a hole by using the high-pressure jet grouting pile machine, and drilling the hole by using a drill to a designed elevation; injecting polyurethane-water glass slurry into the drill hole, stopping water and plugging the water-rich sand layer by utilizing the characteristic that the polyurethane-water glass slurry generates a water-insoluble gel through a chemical reaction when meeting water, injecting cement-water glass slurry after the polyurethane-water glass slurry is completely condensed, and reinforcing the water-rich sand layer by utilizing the characteristic that the cement-water glass slurry solidified body is high in strength; and after the completion, continuing grouting by using cement-water glass slurry to ensure complete grouting. The method can realize water plugging and reinforcement of the water-rich sand layer, and has better effect.
Description
Technical Field
The invention relates to a construction method of a tunnel and underground engineering, in particular to a method for reinforcing a water-rich sand layer with high flow rate underground water by high-pressure rotary jet grouting.
Background
Along with the rapid development of underground space development, more and more tunnel engineering all can meet rich water sand layer in the work progress, rich water sand layer water source is abundant, groundwater seepage speed is big, has certain pressure-bearing nature, probably arouses gushing water, gushing sand and collapse the accident to influence ground, the safety of surrounding environment, also seriously influence engineering progress and construction quality simultaneously, lead to the emergence that the engineering can't go on or cause accidents such as casualties even, thereby cause huge economic loss. Therefore, when meeting a water-rich sand layer, grouting and water plugging reinforcement are often needed to carry out tunnel construction.
At present, the most common grouting method in shallow tunnel surrounding rock grouting reinforcement is a ground high-pressure jet grouting pile grouting method. The high-pressure jet grouting method is introduced from Japan at first, utilizes a high-pressure hydraulic jet cutting mechanism, stirs soil, chemical grout or cement grout together and strengthens surrounding rock, and has the advantages of small construction land occupation, small vibration, low noise and the like.
The grouting materials commonly selected by the existing high-pressure jet grouting pile grouting method comprise single-liquid cement paste and cement-water glass double-liquid paste. The groundwater seepage velocity is great in the rich water sand bed, owing to receive the effect that the groundwater erodees, dilutes the seepage, if adopt single liquid grout as grouting material, then the cement granule in the sand bed is washed away from the sand bed hole by the groundwater of the high velocity of flow before solidification yet easily to make the pile body of jet grouting pile receive different degree segregation, erosion, lead to the pile footpath of jet grouting pile to reduce, disconnected stake probability greatly increased, the rich water sand bed is difficult to obtain effectively the reinforcement. Although the cement-water glass double-liquid slurry has a certain water plugging effect on a water-rich sand layer, the slurry has poor controllability of the setting time, low early strength of a solidified body and poor water resistance and durability.
At present, a plurality of chemical grouting materials exist in the market, but the chemical grouting materials generally have the defects of high price, complex manufacturing process, easy pollution to the surrounding environment and the like, and the single use of the chemical grouting materials cannot generate good water plugging and reinforcing effects on water-rich sand layers.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for reinforcing a water-rich sand layer with high-flow-rate underground water by high-pressure rotary jet grouting.
The technical scheme for solving the technical problems is as follows:
a method for reinforcing a water-rich sand layer with high flow rate underground water by high-pressure rotary spraying grouting comprises the following steps:
(1) surveying a water-rich sand layer needing water plugging and reinforcing, and determining the drilling position of the high-pressure jet grouting pile machine;
(2) moving the high-pressure jet grouting pile driver to a designated pile position, and aligning a drill bit to the center of a hole position; preparing polyurethane-water glass slurry and cement-water glass slurry for later use;
(3) drilling by adopting a high-pressure jet grouting pile machine to enable a drill bit to drill at a preset pile position to a designed elevation;
(4) injecting polyurethane-water glass slurry into all the drill holes, stopping water and plugging the water-rich sand layer by utilizing the characteristic that polyurethane-water glass generates a chemical reaction in the presence of water to generate a water-insoluble gel, injecting cement-water glass slurry after the injected polyurethane-water glass slurry is completely condensed, and reinforcing the water-rich sand layer by utilizing the characteristic that the cement-water glass slurry solidified body is high in strength;
(5) and after the injection grouting operation is finished, continuing grouting by using cement-water glass slurry until the grouting is completely finished.
Preferably, the polyurethane-water glass slurry comprises the following raw materials in parts by weight: 2-3 parts of water glass, 80-100 parts of water-soluble polyurethane grouting material and 2-8 parts of catalyst.
Preferably, the cement-water glass slurry comprises the following raw materials in parts by weight: 1-2 parts of water glass, 90-100 parts of P.O.42.5 ordinary portland cement, 50-80 parts of water, 1-3 parts of a water reducing agent, 2-5 parts of an early strength agent and 1-2 parts of an accelerating agent.
Preferably, in the step (2), the high-pressure jet grouting pile driver is in a horizontal state, and the verticality deviation of a drill rod of the high-pressure jet grouting pile driver is not more than 1%.
Preferably, in the step (2), after the high-pressure jet grouting pile machine is positioned, a low-pressure water jet test is performed to check whether the nozzle is unblocked and whether the pressure is normal.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the idea of blocking water first and then reinforcing, the method firstly utilizes the characteristic that polyurethane-water glass generates chemical reaction when meeting water to generate water-insoluble gel to block water on the water-rich sand layer with high-flow-rate underground water, and then utilizes the characteristic that cement-water glass slurry consolidation body has high strength to reinforce the water-rich sand layer, so that cement particles in the water-rich sand layer are prevented from being washed away from the pores of the sand layer by the high-flow-rate underground water before being solidified, and respective advantages of the polyurethane-water glass slurry and the cement-water glass slurry are fully exerted.
2. The polyurethane-water glass slurry reacts quickly after meeting water and releases a large amount of carbon dioxide, and during grouting, larger secondary pressure can be generated to promote the further diffusion of the polyurethane-water glass slurry and the subsequently injected cement-water glass slurry, so that the diffusion ranges of the two grouting slurries are increased, and the reinforcing effect is better.
3. Compared with the method of singly using the polyurethane-water glass slurry for grouting and water plugging reinforcement, the method of firstly using the polyurethane-water glass slurry for water plugging and then using the cement-water glass for reinforcement can reduce the pollution of the polyurethane-water glass slurry to the environment, and because the long-term strength and durability of the polyurethane-water glass grouting reinforcement body can not meet the requirements of the use function of the tunnel, and the cement-water glass grouting reinforcement body can keep higher strength and durability during the design service life of the tunnel, the invention adopts the polyurethane-water glass and cement-water glass slurry grouting reinforcement tunnel surrounding rock combination technology to supplement the polyurethane-water glass and the cement-water glass slurry in function, thereby further improving the water plugging reinforcement effect.
Drawings
FIG. 1 is a flow chart of the method of the invention for high pressure rotary grouting reinforcement of water-rich sand layers with high flow rate of groundwater.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
Referring to fig. 1, the method for reinforcing the water-rich sand layer with high flow rate underground water by high-pressure rotary jet grouting according to the invention adopts a ground high-pressure rotary jet pile grouting method according to the idea of firstly blocking water and then reinforcing, firstly injecting polyurethane-water glass slurry for blocking water and then injecting cement-water glass slurry for reinforcing, and comprises the following specific steps:
(1) engineering investigation: surveying a water-rich sand layer needing water plugging and reinforcing, and determining the drilling position of the high-pressure jet grouting pile machine;
(2) positioning a high-pressure jet grouting pile machine: moving the high-pressure jet grouting pile driver to a designated pile position, aligning a drill bit to the center of a hole position, and then enabling the high-pressure jet grouting pile driver to be placed stably and horizontally, wherein the verticality deviation of a drill rod is not more than 1%; after the high-pressure jet grouting pile machine is in place, performing a low-pressure water jet test to check whether a nozzle is smooth and whether the pressure is normal;
(3) preparing slurry: preparing polyurethane-water glass slurry and cement-water glass slurry for later use while positioning the high-pressure jet grouting pile machine;
(4) drilling: drilling a hole by adopting a high-pressure jet grouting pile machine, and drilling the hole to a designed elevation at a preset pile position by using a drill bit;
(5) grouting: injecting polyurethane-water glass slurry into all the drill holes, stopping water and plugging the water-rich sand layer by utilizing the characteristic that the polyurethane-water glass slurry generates a water-insoluble gel through a chemical reaction when meeting water, injecting cement-water glass slurry after the injected polyurethane-water glass slurry is completely condensed, and reinforcing the water-rich sand layer by utilizing the characteristic that the cement-water glass slurry solidified body is high in strength;
(6) slurry supplementing: after the injection grouting operation is finished, due to the water separation effect of the grout, shrinkage in different degrees generally occurs, so that a cavity appears at the top of a solidified body, and at the moment, the cement-water glass grout is applied to continue grouting for a period of time, so that complete grouting is ensured.
The polyurethane-water glass slurry in the embodiment comprises the following raw materials in parts by weight: 3 parts of water glass, 90 parts of a water-soluble polyurethane grouting material and 5 parts of a catalyst.
The cement-water glass slurry in the embodiment comprises the following raw materials in parts by weight: 2 parts of water glass, 95 parts of P.O.42.5 ordinary portland cement, 65 parts of water, 2 parts of a water reducing agent, 3 parts of an early strength agent and 2 parts of an accelerating agent.
Example 2
This example is based on example 1 and is an improvement on the polyurethane-water glass slurry. The polyurethane-water glass slurry in the embodiment comprises the following raw materials in parts by weight: 2 parts of water glass, 80 parts of water-soluble polyurethane grouting material and 2 parts of catalyst; the cement-water glass slurry in the embodiment comprises the following raw materials in parts by weight: 1 part of water glass, 90 parts of P.O.42.5 ordinary portland cement, 50 parts of water, 1 part of water reducing agent, 2 parts of early strength agent and 1 part of accelerating agent.
Example 3
This example is based on example 1 and is an improvement on the polyurethane-water glass slurry. The polyurethane-water glass slurry in the embodiment comprises the following raw materials in parts by weight: 3 parts of water glass, 100 parts of a water-soluble polyurethane grouting material and 8 parts of a catalyst; the cement slurry in the embodiment comprises the following raw materials in parts by weight: 2 parts of water glass, 100 parts of P.O.42.5 ordinary portland cement, 80 parts of water, 3 parts of a water reducing agent, 5 parts of an early strength agent and 2 parts of an accelerating agent.
The above description is a preferred embodiment of the present invention, but the present invention is not limited to the above description, and any other changes, modifications, substitutions, blocks and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and they are included in the scope of the present invention.
Claims (5)
1. A method for carrying out high-pressure rotary jet grouting reinforcement on a water-rich sand layer with high flow rate underground water is characterized by comprising the following steps:
s1, surveying the water-rich sand layer needing water plugging and reinforcing, and determining the drilling position of the high-pressure jet grouting pile machine;
s2, moving the high-pressure jet grouting pile driver to a designated pile position, and aligning a drill bit to the center of a hole position; preparing polyurethane-water glass slurry and cement-water glass slurry for later use;
s3, drilling a hole by adopting a high-pressure jet grouting pile machine, and drilling the hole to a designed elevation at a preset pile position by using a drill bit;
s4, injecting polyurethane-water glass slurry into all the drill holes, stopping water and plugging the water-rich sand layer by utilizing the characteristic that the polyurethane-water glass generates a chemical reaction when meeting water to generate a water-insoluble gel, injecting cement-water glass slurry after the injected polyurethane-water glass slurry is completely condensed, and reinforcing the water-rich sand layer by utilizing the characteristic that the cement-water glass slurry has high strength of the solidified body;
and S5, after the injection grouting operation is finished, continuing grouting by using cement-water glass slurry until the grouting is completely finished.
2. The method for high-pressure rotary jet grouting reinforcement of the water-rich sand layer with high flow rate of underground water as claimed in claim 1, wherein the polyurethane-water glass slurry comprises the following raw materials in parts by weight: 2-3 parts of water glass, 80-100 parts of water-soluble polyurethane grouting material and 2-8 parts of catalyst.
3. The method for reinforcing the water-rich sand layer with high flow rate of underground water by high-pressure rotary jet grouting according to claim 1, wherein the cement-water glass slurry comprises the following raw materials in parts by weight: 1-2 parts of water glass, 90-100 parts of P.O.42.5 ordinary portland cement, 50-80 parts of water, 1-3 parts of a water reducing agent, 2-5 parts of an early strength agent and 1-2 parts of an accelerating agent.
4. The method for reinforcing the water-rich sand layer with high flow rate of underground water by high-pressure jet grouting according to claim 1, wherein in the step (2), the high-pressure jet grouting pile machine is in a horizontal state, and the verticality deviation of a drill rod of the high-pressure jet grouting pile machine is not more than 1%.
5. The method for high-pressure rotary jet grouting reinforcement of the water-rich sand layer with high flow rate of underground water according to claim 1, characterized in that in the step (2), after the positioning of the high-pressure rotary jet pile machine is completed, a low-pressure water jet test is performed to check whether the nozzle is unblocked and the pressure is normal.
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| CN113737784A (en) * | 2021-09-07 | 2021-12-03 | 中科院广州化灌工程有限公司 | Rotary jet grouting pile forming method in dynamic water sand layer |
| CN113802548A (en) * | 2021-09-03 | 2021-12-17 | 中铁建工集团有限公司 | Construction method of high-pressure jet grouting pile in flowing sand stratum |
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| CN113737784A (en) * | 2021-09-07 | 2021-12-03 | 中科院广州化灌工程有限公司 | Rotary jet grouting pile forming method in dynamic water sand layer |
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