CN103184736B - Method of isolating non-grouting sections for geological chemical grouting - Google Patents
Method of isolating non-grouting sections for geological chemical grouting Download PDFInfo
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- CN103184736B CN103184736B CN201310085470.8A CN201310085470A CN103184736B CN 103184736 B CN103184736 B CN 103184736B CN 201310085470 A CN201310085470 A CN 201310085470A CN 103184736 B CN103184736 B CN 103184736B
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Abstract
The invention discloses a method of isolating non-grouting sections for geological chemical grouting. The method comprises the following steps: hole drilling, drilled hole flushing, water pressurizing, non-grouting section isolation, water drainage, chemical grouting construction, slurry closing, cement replacement, solidifying and hole sealing, wherein non-grouting section isolation comprises determining of the non-grouting sections and the grouting sections and operation of isolating the non-grouting sections; the non-grouting sections at hole opening sections are drilled into the section bottoms of the non-grouting sections by adopting a geological drilling rig; a seamless steel tube is down to the section bottoms of the non-grouting sections; imbedding of hole opening pipes is performed by adopting cement grout or chemical grouting materials both with the ratio of 0.5 to 1, so that closed isolation is realized; each non-grouting section between two grouting sections is drilled into the section bottom of the non-grouting section which needs to be isolated by adopting the geological drilling rig; and quick-setting chemical grouting materials are adopted to perform grouting, so that closed isolation is realized. According to the method, isolating the non-grouting sections is performed according to different situations of the grouting sections; engineering practice is combined; operation is convenient; cost of the closed isolation is low; the non-grouting sections can be isolated from the hole sections effectively, so that the technical problems that distribution of fracture zones is uneven and the situation is difficult to deal with are solved; engineering benefits are ensured; and the requirement of engineering weight is satisfied.
Description
Technical field
The invention belongs to building foundation reinforcement seepage control technique field, especially belong to water conservancy and hydropower dam geological foundation chemical grouting reinforcement seepage control technique field, the non-filling section partition method particularly in a kind of geologic chemistry grouting.
Background technology
In construction of hydropower facilities construction, the anti-seepage reinforcing of Dam construction is important construction technology.Usual dam drag body complex geologic conditions, the weak hyposmosis zone of fracture that may exist within the scope of drag body and on curtain line can have a strong impact on the security of operation of dam.After the curtain cementation of the consolidation and curtain line that complete drag body, chemical grouting is adopted to carry out follow-up reinforcement Anti-seeping technology for weak hyposmosis zone of fracture.The Chemical Grouting Treatment of weak hyposmosis zone of fracture often reinforcement and antiseepage is taken into account, and chemical grouting material mainly adopts epoxy series to starch material.
And the distribution of above-mentioned weak hyposmosis zone of fracture within the scope of drag body and on curtain line has irregular spacing distribution, the features such as buried depth is darker.Weak hyposmosis zone of fracture in the section of hole is divided into grout compartment by chemical grouting, and remainder is divided into non-filling section.
The division of non-filling section decreases the process engineering quantity of chemical grouting, and the construction processing Xiao that effectively can improve chemical grouting is Shuaied ﹑ and reduced the waste of chemical grouting material, to the construction speed of whole engineering and the economy of process significant.
But non-filling section in the section of hole and grout compartment replace and deposit the difficulty adding construction.The existence of non-filling section adds the segment length of grout compartment, and grouting pressure when have impact on grouting and injection rate, be unfavorable for that slurries are effectively injected within the scope of grouting, have larger negative effect to treatment effect.After carrying out grout compartment and the division of non-filling section to hole section, non-filling section does not need to carry out Chemical Grouting Treatment, and packer, after pore-creating, is stuck at the bottom of grout compartment Duan Dingfei filling section section and effectively can crosses non-filling section by existing method.But chemical grouting material has high osmosis, and grouting lasts longer, and after there are the special circumstances such as mudding during grouting, plug can not normally take out.When chemical grouting, grouting pressure is comparatively large, and borehole wall often having depended on injection material, normal appearance slides the special circumstances such as plug.Adopt said method non-filling section is isolated, feasibility and reliability lower.
Summary of the invention
The present invention discloses the non-filling section partition method in the grouting of a kind of geologic chemistry according to the deficiencies in the prior art.The problem to be solved in the present invention is to provide a kind of in geologic chemistry grouting, carries out the method for non-filling section isolation according to different grout compartment situation.
The present invention is achieved through the following technical solutions:
Non-filling section partition method in geologic chemistry grouting, described chemical grouting comprises boring, bore flushing and setting-out, non-filling section isolation, draining, chemical grouting construction, closes slurry, cement displacement and treat solidifying and sealing of hole step, it is characterized in that:
Described non-filling section isolation comprises non-filling section and grout compartment is determined, non-filling section isolated operation;
Non-filling section and grout compartment determine it is the position of fault according to disclosed by previous geology exploratory hole, draw the distribution map of weak hyposmosis band, according to the distribution map of weak hyposmosis band, the weak hyposmosis band in the section of hole is divided into grout compartment and remainder is divided into non-filling section;
Non-filling section isolated operation, the non-filling section of aperture section adopts geological drilling rig to creep at the bottom of non-filling section section, with seamless steel pipe at the bottom of non-filling section section, carries out orifice tube castingin realize closing isolation with the cement grout of 0.5:1 or chemical grouting material; Or the non-filling section between grout compartment adopts geological drilling rig to creep into isolating at the bottom of non-filling section section, adopt rapid hardening chemical grouting material to carry out perfusion and realize closing isolation.
The perfusion of rapid hardening slurry material adopts in limited time or limitation perfusion, ensures that non-filling section possesses certain groundwater increment and reaches sealing effect, controls groundwater increment simultaneously and saves processing cost.
Limitation perfusion: grouting can be terminated when groundwater increment reaches single note 10Kg/m.
Perfusion in limited time: terminate grouting after infusion time reaches 8h.
Helpfulness of the present invention: the present invention carries out the isolation of non-filling section according to different grout compartment situation, the non-filling section of aperture section adopts cement grout to carry out orifice tube castingin, non-filling section between grout compartment adopts rapid hardening chemical grouting material to carry out perfusion and realizes closing isolation, incorporation engineering of the present invention is actual, easy to operate, close isolation cost low, prove that the present invention's non-filling section isolation technology makes non-filling section eliminate the impact of grout compartment through experiment and engineering practice, non-filling section effectively can be separated from the section of hole, it extensively promotes the use in chemical grouting, solve zone of fracture skewness, the technical barrier of difficult treatment, ensure project benefit, meet engineering weight demands.
Accompanying drawing explanation
Fig. 1 is chemical grouting technique schematic block diagram of the present invention;
Fig. 2 is the present invention's non-filling section isolation construction technology geology schematic diagram.
In figure, 1 is grout compartment, and 2 is non-filling sections, and 3 is the non-filling sections of aperture section, and 4 is weak hyposmosis zone of fracture.
Detailed description of the invention
Below by embodiment, the present invention is conducted further description; the present embodiment is only for being further detailed the present invention; but can not be interpreted as limiting the scope of the invention, those skilled in the art can make some nonessential improvement according to foregoing and adjustment belongs to the scope of protection of the invention.
Composition graphs 1.
Comprise the chemical grouting step of non-filling section isolation
(1) hole
Boring aperture should adopt slim-hole drilling, and the hole of minimizing slurries accounts for and pipe accounts for, general employing φ 75mm or φ 56mm.
Adopt if first paragraph is non-filling section perforate
diamond bit, creeps at the bottom of non-filling section section, adopts
seamless steel pipe carries out orifice tube castingin, adopts φ 56mm aperture with hypomere.
If first paragraph is grout compartment, then chemical grouting terminates laggard row orifice tube castingin, to adopt aperture closure grouting, anti-on-slip plug occurs.
(2) bore flushing and setting-out
For preventing landwaste, rock dust from blocking slurries diffusion admittance, after boring terminates, bore flushing (crack flushing) should be carried out.Adopt conduit to pass into great deal running water, rinse to hole from the bottom of hole, until backwater clarification; Crack is rinsed and is adopted press water pulsation to rinse, and flushing pressure is the grouting pressure of 80% but is not more than 1.0MPa, and washing time is no less than 20min.
Packer permeability test is carried out, to judge the permeability on stratum after chemical grouting section each section of bore flushing is clean.When permeability is comparatively greatly as > 1lu, first carry out (wet-milling) cementation filling >0.2mm crack, cause slurries waste and not easily terminate to prevent grout mixing from crossing wide, then carry out chemical grouting; When permeability hour is as≤1lu, directly chemical grouting can be carried out.
(3) non-filling section isolation
Composition graphs 2.
Non-filling section and grout compartment determine it is the position of fault according to disclosed by previous geology exploratory hole, draw the distribution map of weak hyposmosis band, according to the distribution map of weak hyposmosis band, the weak hyposmosis band in the section of hole is divided into grout compartment and remainder is divided into non-filling section;
Non-filling section isolated operation, the non-filling section of aperture section adopts geological drilling rig to creep at the bottom of non-filling section section, with seamless steel pipe at the bottom of non-filling section section, carries out orifice tube castingin realize closing isolation with the cement grout of 0.5:1 or chemical grouting material; Non-filling section between grout compartment adopts geological drilling rig to creep into isolating at the bottom of non-filling section section, adopts rapid hardening chemical grouting material to carry out perfusion and realizes closing isolation.
Employing have that initial viscosity is relatively high, viscosity rises faster rapid hardening chemical grouting material carry out perfusion and need according to field condition in limited time or limitation perfusion.The rapid hardening slurry material viscosity test that the present invention adopts is as shown in the table:
Perfusion needs to prescribe a time limit according to field condition or limitation perfusion, and concrete employing method is as follows:
Limitation perfusion: grouting can be terminated when groundwater increment reaches single note 10Kg/m.Or,
Perfusion in limited time: terminate grouting after infusion time reaches 8h.
(4) draining
The first step: adopt air-supply facility to be blown in hole by wind from return pipe, open inlet pipe, hole internal water accumulation is discharged from inlet pipe.
Second step: employingization pump priming is opened return pipe, ejected in hole by the ponding remained with slurries in hole in being injected from inlet pipe by chemical grout.Because current conventional epoxy grouting material density used is slightly larger than water, and the solubility of water in slurry is very little, but energy emulsification, therefore available being injected in hole drains the water away, or after standing a period of time, after slurry-aqueous mixtures (emulsion) is separated voluntarily, then discharge from slurry traversing valve doorway.
After ponding and pulp-water mixture drain in hole and returns out pure slurry, close overfall valve, start grouting.
(5) chemical grouting construction
1. viscosity controls
According to above chemical grouting mechanism, principle that chemical grouting process should be followed " long to last, low rate, infiltration infiltrating irrigation ".For preventing long reperfusion serosity viscosity of lasting from increasing impact infiltration infiltrating irrigation effect, employ first " and viscosity-time " hyperbola, and configuration viscometer is observed slurry viscosity at the construction field (site), when discovery viscosity is excessive, then changes fresh slurry.
Concrete operations are: carry out viscosity test to the slurry material used and proportioning, test the change that its viscosity is passed in time, draw " viscosity-time " hyperbola according to test data.
When the viscosity of slurry material is more than 100mp ﹒ s, slurries infiltration infiltrating irrigation effect is in the earth formation lower.Therefore, when the viscosity of slurry material is more than 100mp ﹒ s, should pour into changing fresh slurry.With " viscosity-time " hyperbola drawn for instructing, during the slurries of the configuration time that viscosity 100mp ﹒ s is corresponding on curve around, then change fresh slurry perfusion.
2. speed controls
With low rate, long-time lasting infiltration pours into, and generally charge velocity should control between 0.05L/min.m ~ 0.1L/min.m.As injection rate≤0.05L/min.m, suitably should raise grouting pressure, as injection rate >=0.1L/min.m, need suitably reduce grouting pressure or control injection rate.
Grouting pressure controls: last nature with grouting and rise, but when exceeding into slurry speed control criterion, to enter to starch speed for control criterion.
3. be in the milk termination condition
Under design pressure, every 10min surveys and reads once, and after in 1h, continuous 4 reading injection rates are all not more than 0.001L/min.m, Continuous Perfusion 4h can terminate grouting, but grouting must not last and is less than 40h.For ensureing that chemical grout has certain penetration range, reaching quality requirement, controlling penetration range again excessive, avoiding engineering cost too high, as injection rate does not meet above-mentioned condition, grouting time should be extended to meeting ending standard, but every section of grouting time is no more than 72h.
(6) close slurry, cement displacement and wait to coagulate
Modified epoxy grouting material initial viscosity is low, operable time is long, returns ooze for preventing the chemical grouting material poured in rock mass, after grout compartment chemical grouting terminates, closes immediately and carries out closing slurry into (returning) slurry valve, treats gauge hand nature back to zero.
Close after slurry terminates until chemical grouting, adopt grouting facility by cement paste from return pipe injection hole, open inlet pipe valve simultaneously, chemical grout is ejected in hole from inlet pipe.After cement displacement, treat that solidifying 8h can carry out cleaning bottom of hole; The chemical grout displaced focuses on after can collecting.
(7) sealing of hole
Sealing of hole adopts chemical grout in 0.5:1 class g cement underflow displacement hole, and after replacement completion, carry out pure pressure type grouting, sealing of hole pressure is the large grouting pressure of this Kongzui, Grain filling duration 60min.Grouting sealing of hole is after in hole, cement grout solidifies, and grout hole top rest, when being greater than 3.0m, should adopt mechanical mud jacking to continue sealing of hole, when being less than 3.0m, uses the packing of water sand mud artificial real.
Construction equipment all can be bought, and comprising: rig adopts XY-2 or XY-2B rig; Cementation and setting-out adopt 3SNS high pressure grouting pump, and chemical grouting adopts JD-125/10ization to fill with proportioning pump; Drainage plant adopts small-sized air compressor.
Case history
The Chemical Grouting Treatment of certain left bank, one-level power station F5 tomography domestic, Flc13 tomography, F2 tomography, lamprophyre veins have employed non-filling section isolation skill art ﹑ " wind-slurry " and combines and catch up with water technology and cement replacement technique.
Non-filling section isolation technology enhances the specific aim of weak hyposmosis zone of fracture chemical grouting, largely Shangdi improves construction speed and treatment effect, and incorporation engineering of the present invention is actual, easy to operate, close isolation cost low, non-filling section is eliminated the impact of grout compartment, and non-filling section effectively can be separated from the section of hole, it extensively promotes the use in chemical grouting, solve zone of fracture skewness, the technical barrier of difficult treatment, ensures project benefit, meets engineering weight demands.
By the improvement to above-mentioned technique; left bank, power station weak hyposmosis zone of fracture Chemical Grouting Treatment completes construction task satisfactorily within the construction period; cost control is greatly improved; environmental protection achieves huge progress; after filling with, the every mechanical index of rock mass improves obviously, meets design requirement.
Claims (2)
1. the non-filling section partition method in a geologic chemistry grouting, described chemical grouting comprises boring, bore flushing and setting-out, non-filling section isolation, draining, chemical grouting construction, closes slurry, cement displacement and treat solidifying and sealing of hole step, it is characterized in that: described non-filling section isolation comprises non-filling section and grout compartment is determined and non-filling section isolated operation;
Non-filling section and grout compartment are determined: according to the position of fault disclosed by geological prospecting hole, draw the distribution map of weak hyposmosis band, according to the distribution map of weak hyposmosis band, the weak hyposmosis band in the section of hole is divided into grout compartment and remainder is divided into non-filling section;
Non-filling section isolated operation: the non-filling section of aperture section adopts geological drilling rig to creep at the bottom of non-filling section section, with seamless steel pipe at the bottom of non-filling section section, carries out orifice tube castingin with the cement grout of 0.5:1 or chemical grouting material and realizes closing isolation; Or the non-filling section between grout compartment adopts geological drilling rig to creep into isolating at the bottom of non-filling section section, carry out perfusion with rapid hardening chemical grouting material and realize closing isolation.
2. the non-filling section partition method in geologic chemistry grouting according to claim 1, is characterized in that: the perfusion of rapid hardening chemical grouting material adopts in limited time or limitation perfusion;
Infusion time terminates grouting after reaching 8h in limited time; Or,
Limitation groundwater increment terminates grouting when reaching single note 10Kg/m.
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| CN103410149A (en) * | 2013-08-08 | 2013-11-27 | 葛洲坝集团试验检测有限公司 | Grouting method for bedrock under deep water conditions |
| CN117468415B (en) * | 2023-12-28 | 2024-03-19 | 中国电建集团西北勘测设计研究院有限公司 | Dam joint grouting device and grouting method |
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| CN201090030Y (en) * | 2007-08-20 | 2008-07-23 | 中国水利水电第七工程局 | Grouting plug for mending concrete tear with chemical grouting |
| CN101694094B (en) * | 2009-10-23 | 2012-07-04 | 中国水利水电第七工程局成都水电建设工程有限公司 | Reinforcing and strengthening processing method of chemical grout |
| CN101936113B (en) * | 2010-09-13 | 2011-11-09 | 天津天一建设集团有限公司 | Method for grouting sealing of gap between steel door frame of protective sealed door and wall |
| CN102828502B (en) * | 2012-08-15 | 2015-05-13 | 中科院广州化学有限公司 | Construction method for in-situ reinforcing of high-pressure cement-chemical pulp compound grouting |
| CN102808427B (en) * | 2012-08-21 | 2014-08-13 | 中国水利水电第七工程局成都水电建设工程有限公司 | Composite grouting reinforcement anti-seepage treatment technology |
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