CN109235440B - Seepage-proofing grouting method for completely weathered granite stratum - Google Patents
Seepage-proofing grouting method for completely weathered granite stratum Download PDFInfo
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- CN109235440B CN109235440B CN201811049492.8A CN201811049492A CN109235440B CN 109235440 B CN109235440 B CN 109235440B CN 201811049492 A CN201811049492 A CN 201811049492A CN 109235440 B CN109235440 B CN 109235440B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
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Abstract
The invention discloses an anti-seepage grouting method for a completely weathered granite stratum, which comprises the following steps: (1) drilling the grouting section to a designed depth; (2) pouring a jacket material; (3) a lower slurry pouring pipe; (4) and (4) aiming at different stratum depths, adopting different instantaneous impact pressures to perform interval lifting grouting, and sealing holes after grouting is finished. According to the invention, different instantaneous-flushing grouting pressures are adopted for different depth strata, and the large-caliber grouting pipe is used for grouting, so that the whole seepage-proofing treatment stratum can effectively form a homogeneous body composite foundation with higher compactness and better seepage-proofing performance, and the seepage-proofing requirement of engineering design of less than 5Lu is met.
Description
Technical Field
The invention belongs to the field of geotechnical engineering foundation seepage-proofing grouting treatment, and particularly relates to an seepage-proofing grouting method suitable for a completely weathered granite stratum.
Background
The granite weathered bodies have some characteristics different from other rock-soil bodies, and the physical states of the granite weathered bodies in different areas are different. The completely weathered granite has the characteristics of being between earth and stones, is generally completely weathered on the earth surface, is mostly sandy soil with poor grading, has a loose surface structure, and is crushed by hands to form a residual parent rock structure. The fully weathered granite mass has the corresponding characteristics of loose sand and soil mass and the characteristic of higher rock mass strength. The fully weathered granite mainly comprises quartz, has a strength of hard and angular shape, and contains, in the grain size components, the content of sticky particles is generally 5% -15%, the content of angle gravel is 5% -60%, the content of sand particles is basically more than 30%, the particles are in a slightly-to-medium-density sand-soil shape, and some hard spherical boulders and irregular blocky strongly weathered rock masses or a small amount of lenticular late-stage invasion rock veins are clamped between the particles. The bearing capacity of the completely weathered granite stratum foundation is not uniform, the deviation is large, the minimum is 100KPa, the maximum is 400 KPa, and most of the bearing capacity is 100-250 KPa.
The fully weathered granite mass has the corresponding characteristics of loose sand and soil mass and the characteristic of higher rock mass strength. The prior commonly used anti-seepage grouting method comprises the following steps: plastic concrete continuous wall, high pressure jet grouting, static pressure grouting, conventional curtain grouting, pure pressure grouting, circulating grouting, etc. The plastic concrete continuous wall is mainly suitable for seepage prevention of homogeneous earth dams and earth foundations, continuous construction is difficult when spherical large rock blocks are encountered in construction, the hole wall is easy to collapse, and the rock blocks are difficult to treat in a construction groove. The high-pressure jet grouting has the defects that the completely weathered granite is dense, the hydraulic cutting is difficult, the influence radius is small, and the high-pressure jet grouting cannot be sprayed when meeting rock blocks, so that the continuity of an anti-seepage curtain body is poor, and the construction quality is influenced. The static pressure grouting can only carry out pouring, filling and compaction on cracks and weak places, so that a complete water-proof wall is difficult to form, and the seepage-proofing effect is poor. The problems of large amount of slurry leakage, pipe fixing and plug burying, no slurry absorption, slurry back concentration and the like frequently occur in the same pipe section in the conventional curtain grouting. The main reasons for the pure pressure type grouting process in the completely weathered granite stratum are that the cement grout does not circulate in the hole, the hole wall is easy to form an adhesion layer to block micro cracks, and grout cement particles are easy to precipitate or solidify among grout pipes, grout stopping plugs and the hole wall. The circulating grouting process is less than pure pressure type accidents, the efficiency is slightly improved, but the circulating grouting process still belongs to low-efficiency production, and accidents are easy to happen and the construction quality is difficult to guarantee for broken stratums or vertical fracture stratums and hole sections with uneven apertures.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects and shortcomings in the background technology and providing an anti-seepage grouting method suitable for a completely weathered granite stratum.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
an anti-seepage grouting method for a completely weathered granite stratum comprises the following steps:
(1) drilling the grouting section to a designed depth;
(2) pouring a jacket material;
(3) a lower grouting pipe, a connecting pipeline, grouting equipment, a pressure gauge and the like;
(4) and (3) aiming at different stratum depths, adopting different instantaneous impact pressures to perform interval lifting grouting, controlling the grouting to be finished according to a constant pressure standard, and sealing holes after grouting is finished.
Preferably, in the impermeable grouting method, in the step (1), the diameter of the drilled hole is 75-110 mm.
In the above anti-seepage grouting method, preferably, in the step (2), the casing material is mainly prepared by mixing cement, clay and water; wherein the mass ratio of the cement to the clay is (1:2) - (1:3), and the mass ratio of the total mass of the cement and the clay to the water is (1:1) - (1: 1.5).
Preferably, in the impermeable grouting method, in the step (3), the inner diameter of the grouting pipe is 50 mm-70 mm.
Preferably, in the impermeable grouting method, in the step (4), the grouting slurry is mainly formed by mixing water, cement and fully weathered granite passing through a 20mm square-hole sieve, wherein the mass ratio of the water, the cement and the fully weathered granite passing through the 20mm square-hole sieve is (0.6-0.8): 1 (2-4).
In the above-mentioned impermeable grouting method, preferably, the slump of the slurry is 100mm to 200 mm.
In the impermeable grouting method, preferably, in the interval lifting grouting process in the step (4), when the depth of a poured stratum exceeds 20m, the peak grouting pressure is 2.5-3.0 MPa; when the grouting is carried out for 15-20 m, the peak pressure of grouting is controlled to be 2.0-2.5 MPa; when the grouting is carried out for 10-15 m, the peak pressure of grouting is 1.5-2.0 MPa; when the pressure is poured to 5-10 m, the peak pressure value of the grouting is 1.0-1.5 MPa; and finishing the anti-seepage grouting treatment after the grouting is carried out to 5 m.
Pressure gauge with peak value in each depth range
Preferably, in the anti-seepage grouting method, in the interval lifting grouting process in the step (4), the length of the interval lifting section is 0.3-0.5 m; after the grouting pressure of the section reaches the peak value continuously for three times, lifting the grouting pipe of 0.3m to 0.5m for continuous grouting, and unloading one grouting pipe when lifting 1 m.
In the above-mentioned impermeable grouting method, preferably, the constant pressure standard at the end of the constant pressure standard control means that the peak pressure requirement of the section is reached three times in succession.
And (3) quality standard and inspection of impermeable grouting:
a. the grouting quality standard is mainly designed according to the grouting engineering property and purpose, and the anti-seepage grouting quality standard is mainly the standard of the basic permeability coefficient after grouting;
b. the quality inspection method generally adopts a drilling undisturbed sampling mechanical test, a drilling hydrogeological test and the like according to a design quality standard.
Compared with the prior art, the invention has the advantages that:
(1) the invention researches a grouting method for a completely weathered granite stratum, wherein in the grouting process, screened completely weathered granite sand is used as a main grouting material, and is mixed with cement and water to prepare slurry with aggregate, fine particles in the slurry are mainly subjected to permeation and splitting, and a coarse aggregate component can control the diffusion radius of the slurry and simultaneously generate a compaction effect; meanwhile, the invention also adopts different instant-flushing grouting pressures for strata at different depths and uses a large-caliber grouting pipe for grouting, so that the whole seepage-proofing treatment stratum can effectively form a homogeneous body composite foundation with higher compactness and better seepage-proofing performance, and the seepage-proofing requirement of engineering design of less than 5Lu is met.
(2) The grouting method can effectively solve the problem of seepage-proofing treatment of the completely weathered granite stratum, is economic and environment-friendly, and easily meets the seepage-proofing requirement of engineering design.
(3) The seepage-proofing grouting method for the completely weathered granite stratum does not need to additionally arrange a scheme or additionally increase a large amount of workload due to the existence of spherical boulders in the stratum; due to the specific grouting materials and process parameters adopted by the method, the method disclosed by the invention has sufficient suitability for the corresponding characteristics of the wide cracks and the fine cracks of the completely weathered granite stratum, and the treated stratum has good seepage-proofing capability through grouting quality inspection.
Drawings
FIG. 1 is a flow chart of an anti-seepage grouting treatment process for a fully weathered granite formation according to example 1 of the present invention.
Detailed Description
In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Example (b):
the upper part of the completely weathered granite stratum to be treated is granite weathered residual soil with the thickness of 2-5 m; the lower part is the weathered granite with the thickness of 20-35 m.
The anti-seepage grouting method for the completely weathered granite formation, of which the process flow diagram is shown in fig. 1, comprises the following steps:
(1) drilling with a common geological drilling machine along with a pipe, wherein the diameter of a drilled hole is 110mm, the diameter of a final hole is 75mm, and the hole is formed by one-time drilling;
(2) cement clay slurry is poured into the holes, and a casing material is prepared by mixing cement, clay and water, wherein the mass ratio of the cement to the clay is 1:3, and the mass ratio of the total mass of the cement and the clay to the water is 1: 1.5;
(3) connecting a large-caliber grouting pipe with the diameter of 55mm, lowering the grouting pipe to the bottom of a hole, wherein the hole opening is about 1m higher, installing a pipe drawing machine, drawing out a sleeve pipe, and connecting devices such as a pipeline, a pressure gauge and the like;
(4) lifting grouting (grouting slurry with aggregate and 100-200 mm slump which is prepared by mixing water and cement with the mass ratio of 0.8:1:2.2 and fully weathered granite sandy soil passing through a 20mm square-hole sieve) at an instantaneous pressure interval of 3MPa by using a high-pressure pulsation grouting pump, wherein the length of a lifting interval section is 0.5m, namely after the grouting pressure of the section continuously reaches the requirement of the peak pressure of the section for three times, a grouting pipe of 0.5m is lifted for continuous grouting, and one grouting pipe is unloaded when each lifting of 1m is finished; after the pressure is poured to 20m, the pressure peak value is reduced to 2.5MPa, and the pressure peak value is reduced by 0.5MPa when the pressure peak value is increased by 5m to 5-10 m and is 1.5 MPa; and (5) after pouring to 5m, replacing and sealing the hole by thick slurry, and finishing the anti-seepage grouting treatment of the hole.
And (3) performing sound wave test on stratum drilling holes before and after grouting, improving the Vp value after grouting, reducing the fluctuation amplitude and showing that the grouting treatment effect is better. Sampling the stratum before and after grouting for geotechnical test detection: average dry density of raw soil sample is 1.77g/cm3Average porosity 32.2%; the average dry density of the soil sample after grouting is 1.88g/cm3And the average porosity is 28.2 percent, which shows that the compactness of the soil body is improved after grouting. Permeability coefficient of original soil sample 3.4X 10-4cm/s and 4.9X 10-4cm/s is the medium water permeability grade; soil body permeability coefficient after grouting is 8.3 multiplied by 10-5cm/s and 7.3X 10-5S is weak water permeabilityAnd (4) grading. The inspection shows that the stratum after the seepage-proofing treatment forms a homogeneous body composite foundation with high compactness and good seepage-proofing performance, and the seepage-proofing requirement of the engineering design of less than 5Lu is met.
Claims (1)
1. An anti-seepage grouting method for a completely weathered granite stratum is characterized by comprising the following steps:
(1) drilling the grouting section to a designed depth, wherein the diameter of the drilled hole is 75-110 mm;
(2) pouring a shell material, wherein the shell material is mainly prepared by mixing cement, clay and water; wherein the mass ratio of the cement to the clay is (1:2) - (1:3), and the mass ratio of the total mass of the cement and the clay to the water is (1:1) - (1: 1.5);
(3) the inner diameter of the grouting pipe is 50-70 mm;
(4) adopting different instantaneous impact pressures to perform interval lifting grouting according to different stratum depths, and sealing holes after grouting is finished; the grouting slurry is mainly formed by mixing water, cement and fully weathered granite passing through a 20mm square-hole sieve, wherein the mass ratio of the water to the cement to the fully weathered granite passing through the 20mm square-hole sieve is (0.6-0.8) to 1 (2-4), and the slump of the slurry is 100-200 mm; in the interval lifting grouting process, when the depth of a poured stratum exceeds 20m, the peak grouting pressure is 2.5-3.0 MPa; when the depth of the stratum is more than 15m and less than or equal to 20m, the peak pressure of grouting is controlled to be 2.0-2.5 MPa; when the depth of the stratum is more than 10m and less than or equal to 15m, the peak pressure of grouting is 1.5-2.0 MPa; when the depth of the stratum is more than 5m and less than or equal to 10m, the peak pressure of grouting is 1.0-1.5 MPa; when the depth of the stratum is less than or equal to 5m, replacing the stratum with thick slurry and sealing the pores, and finishing the anti-seepage grouting treatment; in the interval lifting grouting process, the length of the interval lifting section is 0.3-0.5 m; and controlling the interval grouting to finish according to a constant pressure standard, wherein the constant pressure standard means that the peak pressure requirement of the interval is continuously reached for three times.
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| CN201811049492.8A CN109235440B (en) | 2018-09-10 | 2018-09-10 | Seepage-proofing grouting method for completely weathered granite stratum |
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| CN111997077A (en) * | 2020-07-22 | 2020-11-27 | 中电建十一局工程有限公司 | Grouting anti-seepage treatment method for completely weathered granite stratum |
| CN112726648A (en) * | 2020-12-30 | 2021-04-30 | 中交第一航务工程局有限公司 | Grouting method for strongly weathered geological section |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20110109103A (en) * | 2010-03-30 | 2011-10-06 | (주)지구환경전문가그룹 | Restoration method of leakage in liquid waste |
| CN102635112A (en) * | 2012-04-09 | 2012-08-15 | 湖南宏禹水利水电岩土工程有限公司 | Controlled construction process for compaction grouting piles |
| CN102839651A (en) * | 2012-09-19 | 2012-12-26 | 中国水电顾问集团中南勘测设计研究院 | Drilling and grouting integrated top-down high-pressure impact extrusion grouting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110109103A (en) * | 2010-03-30 | 2011-10-06 | (주)지구환경전문가그룹 | Restoration method of leakage in liquid waste |
| CN102635112A (en) * | 2012-04-09 | 2012-08-15 | 湖南宏禹水利水电岩土工程有限公司 | Controlled construction process for compaction grouting piles |
| CN102839651A (en) * | 2012-09-19 | 2012-12-26 | 中国水电顾问集团中南勘测设计研究院 | Drilling and grouting integrated top-down high-pressure impact extrusion grouting method |
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