CN110017152B - Underground engineering extremely-broken surrounding rock stepped grouting reinforcement method - Google Patents
Underground engineering extremely-broken surrounding rock stepped grouting reinforcement method Download PDFInfo
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- CN110017152B CN110017152B CN201910224615.5A CN201910224615A CN110017152B CN 110017152 B CN110017152 B CN 110017152B CN 201910224615 A CN201910224615 A CN 201910224615A CN 110017152 B CN110017152 B CN 110017152B
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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
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
Abstract
The invention discloses a stepwise grouting reinforcement method for extremely-broken surrounding rocks of underground engineering, which comprises the following steps of: s1, grouting and reinforcing shallow extremely-broken surrounding rock; s2, grouting and reinforcing the middle extremely-broken surrounding rock through a middle grouting anchor cable; s3, performing a drawing test on the middle grouting anchor cable, judging whether the drawing force reaches a set range, if so, executing a step S4, and if not, executing a step S5; s4, grouting and reinforcing deep extremely-broken surrounding rock; and S5, adjusting the support parameters of the middle grouting anchor cable. The method can quickly and effectively reinforce extremely-broken surrounding rocks in underground engineering; the shallow extremely-broken surrounding rock is quickly condensed into a whole, the integrity of the surrounding rock is improved, and the phenomena of hole collapse and drill sticking of the surrounding rock are effectively solved; the middle and deep extremely-broken surrounding rocks are enabled to enhance self-bearing capacity, the primary support strength of the surrounding rocks is improved, the mechanical property of the extremely-broken surrounding rocks is improved, and deformation and damage of the extremely-broken surrounding rocks are controlled.
Description
Technical Field
The invention relates to the technical field of safety in underground engineering, in particular to a stepwise grouting reinforcement method for extremely-broken surrounding rocks of underground engineering.
Background
With the continuous development and utilization of underground space, underground engineering faces the problems of large ground contact stress and broken surrounding rocks, and particularly, the extremely broken surrounding rocks are critical to the stability of the underground engineering when the underground engineering passes through the surrounding rocks under complex geological conditions such as faults, old dead zones and the like.
The commonly used method for reinforcing the extremely-broken surrounding rock at present is anchor rod (cable) and grouting reinforcement, and has the following defects: the traditional grouting has the problems of long cement slurry solidification time, low early strength, easy segregation and precipitation of slurry and gap after injection and solidification, and can not effectively reinforce extremely broken surrounding rock; due to poor integrity and stability of the extremely-broken surrounding rock, a drill jamming phenomenon occurs when an anchor rod (cable) hole is drilled, and the anchor rod (cable) cannot reinforce the extremely-broken surrounding rock; when the anchor rod (cable) is used for supporting, the cohesive force of the anchoring agent and extremely broken surrounding rock is too small, the anchoring force cannot be ensured, and the mechanical property of the anchor rod (cable) cannot be fully exerted; extremely broken country rock crack develops, adopts conventional slip casting to consolidate, and the cement thick liquid produces the hourglass thick liquid phenomenon easily after pouring into the country rock, can't carry out effective reinforcement to extremely broken country rock.
Disclosure of Invention
The invention mainly solves the technical problems in the prior art, and provides the underground engineering extremely-broken surrounding rock step-by-step grouting reinforcement method which is rapid and effective in reinforcement and good in stability.
The technical problem of the invention is mainly solved by the following technical scheme:
the invention provides a stepwise grouting reinforcement method for extremely-broken surrounding rocks of underground engineering, which comprises the following steps:
s1, grouting and reinforcing shallow extremely-broken surrounding rock;
s2, grouting and reinforcing the middle extremely-broken surrounding rock through a middle grouting anchor cable;
s3, performing a drawing test on the middle grouting anchor cable, judging whether the drawing force reaches a set range, if so, executing a step S4, and if not, executing a step S5;
s4, grouting and reinforcing deep extremely-broken surrounding rock;
and S5, adjusting the support parameters of the middle grouting anchor cable.
Further, the step S1 specifically includes: and (3) drilling a hollow grouting anchor rod on the shallow extremely-broken surrounding rock, and injecting chemical grout into the shallow extremely-broken surrounding rock through the grouting anchor rod for reinforcement.
Further, the chemical slurry comprises a mixed solution of water glass and Marilyn.
Further, the step S2 specifically includes: and (3) applying a middle grouting anchor rope on the middle extremely-broken surrounding rock, and injecting cement slurry into the middle extremely-broken surrounding rock through the middle grouting anchor rope for reinforcement.
Further, the step S4 specifically includes:
constructing a deep grouting anchor cable on the deep extremely-broken surrounding rock, and anchoring the end part of the deep grouting anchor cable by using an anchoring agent;
applying prestress to the deep grouting anchor cable;
and grouting and reinforcing the deep surrounding rock by grouting cement slurry.
Furthermore, an early strength agent and a micro-expanding agent are added into the cement slurry.
The invention has the beneficial effects that: carrying out rapid and effective reinforcement on extremely-broken surrounding rocks in underground engineering; the shallow extremely-broken surrounding rock is quickly condensed into a whole, the integrity of the surrounding rock is improved, and the phenomena of hole collapse and drill sticking of the surrounding rock are effectively solved; the middle and deep extremely-broken surrounding rocks are enabled to enhance self-bearing capacity, the primary support strength of the surrounding rocks is improved, the mechanical property of the extremely-broken surrounding rocks is improved, and deformation and damage of the extremely-broken surrounding rocks are controlled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a step-by-step grouting reinforcement method for extremely-broken surrounding rocks of underground engineering;
FIG. 2 is a view showing the shallow extremely fragmented surrounding rock of the present invention being grouted for reinforcement;
FIG. 3 is a diagram showing the state of grouting reinforcement of extremely fragmented surrounding rock in the middle of the present invention;
fig. 4 is a state diagram of grouting reinforcement of deep extremely-fractured surrounding rock according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.
Referring to fig. 1-4, the underground engineering extremely-broken surrounding rock step-by-step grouting reinforcement method comprises the following steps:
s1, grouting and reinforcing the shallow extremely-broken surrounding rock 1;
s2, grouting and reinforcing the middle extremely-broken surrounding rock 2 through the middle grouting anchor cable 4;
s3, performing a drawing test on the middle grouting anchor cable 4, judging whether the drawing force reaches a set range, if so, executing a step S4, and if not, executing a step S5;
s4, grouting and reinforcing the deep extremely-broken surrounding rock 3;
and S5, adjusting the support parameters of the middle grouting anchor cable 4. The support parameters of the invention include increasing the diameter and length of the middle grouting anchor cable 4.
Step S1 of the present invention specifically includes: and (3) constructing a hollow grouting anchor rod 5 on the shallow extremely-broken surrounding rock 1, and injecting chemical grout into the shallow extremely-broken surrounding rock 1 through the grouting anchor rod 5 for reinforcement. In the present invention, the chemical slurry includes a mixture of water glass and Marilyn, and in other embodiments of the present invention, the chemical slurry may be other mixtures. Through the quick solidification effect of chemical grout, can solidify into a whole with utmost point broken front portion country rock 1, reinforcing country rock integrality can effectively solve the phenomenon of hole collapse and sticking of bore to the problem that appears leaking thick liquid and trickling thick liquid when preventing follow-up cement grout from pouring into middle part, the extremely broken country rock in deep.
Step S2 of the present invention specifically includes: and (3) applying and beating a middle grouting anchor cable 4 on the middle extremely-broken surrounding rock 2, and injecting cement slurry into the middle extremely-broken surrounding rock 2 through the middle grouting anchor cable 4 to reinforce, so that the shallow extremely-broken surrounding rock and the middle extremely-broken surrounding rock are solidified into a whole, and the integrity of the surrounding rock is further enhanced.
And step S4 specifically includes:
applying a deep grouting anchor cable 6 on the deep extremely-broken surrounding rock 3, and anchoring the end part of the deep grouting anchor cable 6 by using an anchoring agent 7; applying prestress to the deep grouting anchor cable 6; and grouting and reinforcing the deep surrounding rock by grouting cement slurry. Therefore, the shallow extremely-broken surrounding rock 1, the middle extremely-broken surrounding rock 2 and the deep extremely-broken surrounding rock 3 can form a whole, active supporting of the grouting anchor rod (cable) on the extremely-broken surrounding rock is achieved, meanwhile, the load of the shallow extremely-broken surrounding rock 1 can be transmitted to the deep extremely-broken surrounding rock 3 through the grouting anchor rod (cable), and the self-stability capability of the deep extremely-broken surrounding rock 3 is fully exerted.
The early strength agent and the micro-expanding agent are added into the cement slurry, so that the cement slurry has higher strength in a shorter time, the volume of the cement slurry is expanded after solidification to fill the gaps of extremely broken surrounding rocks, and the problems of overlong cement reaction time and volume shrinkage can be solved.
In conclusion, the method can quickly and effectively reinforce extremely-broken surrounding rocks in underground engineering; the shallow extremely-broken surrounding rock is quickly condensed into a whole, the integrity of the surrounding rock is improved, and the phenomena of hole collapse and drill sticking of the surrounding rock are effectively solved; the middle and deep extremely-broken surrounding rocks are enabled to enhance self-bearing capacity, the primary support strength of the surrounding rocks is improved, the mechanical property of the extremely-broken surrounding rocks is improved, and deformation and damage of the extremely-broken surrounding rocks are controlled.
The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (2)
1. A stepwise grouting reinforcement method for underground engineering extremely-broken surrounding rock is characterized by comprising the following steps:
s1, grouting and reinforcing shallow extremely-broken surrounding rock;
a hollow grouting anchor rod is arranged on the shallow extremely-broken surrounding rock, and chemical grout is injected into the shallow extremely-broken surrounding rock through the grouting anchor rod for reinforcement;
s2, grouting and reinforcing the middle extremely-broken surrounding rock through a middle grouting anchor cable;
a middle grouting anchor rope is arranged on the middle extremely-broken surrounding rock, and cement slurry is injected into the middle extremely-broken surrounding rock through the middle grouting anchor rope for reinforcement;
s3, performing a drawing test on the middle grouting anchor cable, judging whether the drawing force reaches a set range, if so, executing a step S4, and if not, executing a step S5;
s4, grouting and reinforcing deep extremely-broken surrounding rock;
applying a deep grouting anchor cable on the deep extremely-broken surrounding rock, and anchoring the end part of the deep grouting anchor cable by using an anchoring agent;
and S5, adjusting the support parameters of the middle grouting anchor cable.
2. The method for reinforcing the extremely-broken surrounding rock of the underground engineering by step grouting according to claim 1, wherein an early strength agent and a micro-expanding agent are added into the cement slurry.
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| CN110486067A (en) * | 2019-09-09 | 2019-11-22 | 中交路桥建设有限公司 | A kind of gas tunnel system anchor bolt and the safe construction method of anchor pole detection |
| CN110736430B (en) * | 2019-10-16 | 2021-06-22 | 中国矿业大学(北京) | Fiber grating displacement meter installation and protection method suitable for deep underground engineering |
| CN110985058B (en) * | 2019-12-26 | 2021-03-23 | 安徽理工大学 | Grouting reinforcement method for fault fracture zone of coal face |
| CN112554910A (en) * | 2020-12-04 | 2021-03-26 | 中煤科工开采研究院有限公司 | Grouting reinforcement method for roadway impacted by dynamic load |
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