CN103437339A - Construction method for sealing karst cave near trench wall of underground continuous wall in karst stratum - Google Patents
Construction method for sealing karst cave near trench wall of underground continuous wall in karst stratum Download PDFInfo
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Abstract
本发明提供了一种岩溶地层地下连续墙槽壁附近溶洞封闭的施工方法，步骤包括：第一步、溶洞情况调查；第二步、抽排岩溶水；第三步、溶洞内初次填料；第四步、初次双液注浆加固；第五步、二次填料和二次双液注浆加固；第六步、在完成水泥水玻璃双液注浆封闭整个边界后，再采用水泥浆进行压密注浆，至达到停止注浆的技术标准；第七步、当注浆结束拔出注浆管后，立即用M7.5号水泥砂浆封孔；封孔完毕后，位于此注浆孔周边的溶洞即完成了封闭；第八步、溶洞治理效果检查。本发明能够减少水泥浆用料、缩短水泥水玻璃浆液凝结时间、提高施工效率、保护周边环境、保证注浆浆体凝结后的强度、确保工程安全进行。
The invention provides a construction method for sealing a karst cave near the groove wall of an underground diaphragm wall in a karst formation. The steps include: the first step, investigating the condition of the karst cave; the second step, pumping and draining karst water; the third step, initial filling in the karst cave; The fourth step is the initial double-liquid grouting reinforcement; the fifth step is the second filler and the second double-liquid grouting reinforcement; the sixth step is to use cement slurry to press after the cement water glass double-liquid grouting is completed to seal the entire boundary. Dense grouting until the technical standard for stopping grouting is reached; step 7, when the grouting is finished, pull out the grouting pipe, and immediately seal the hole with M7.5 cement mortar; after the hole is sealed, place it around the grouting hole The karst cave has been closed; the eighth step is to check the effect of karst cave treatment. The invention can reduce the cement slurry material, shorten the cement water glass slurry coagulation time, improve the construction efficiency, protect the surrounding environment, ensure the strength of the grout injection slurry after coagulation, and ensure the safety of the project.
Description
Technical field
The present invention relates to a kind of job practices of construction engineering technical field, particularly, relate near the job practices of the solution cavity sealing of a kind of karst strata groove inside of continuous underground wall.
Background technology
While generally carrying out construction of diaphragm wall, all need mud to carry out retaining wall, prevent landslip of the sides of the trench.But when the lime karst area carries out construction of diaphragm wall, the slurry coat method used during grooving and concrete usually because of near exist cavern and run off.This has not only caused a large amount of wastes of engineering material, and affects the quality of groove inside of continuous underground wall.For the bearing capacity that makes diaphragm wall can meet the demands, must the karst cavern around it be sealed, consolidation process, and prevention solution cavity, soil cave further develop, effectively reduce and build up rear operations risks.
By understanding practice of construction situation in domestic each case history, and in conjunction with to the research of prior art document, for the processing of karst engineering geology problem mainly contain remove cram method, girder span is got over method, dynamic compaction, perfusion, deep foundation method, rotary jet strengthening method etc.Existing technical literature is retrieved to rear discovery, and number of patent application is 201110119797.3, denomination of invention: a kind of karst grouting reinforcement water-stop constructing method; And number of patent application is 201010508249.5, denomination of invention: sleeve valve pipe construction method for grouting reinforcement, above document is the sleeve valve pipe that utilizes unidirectional grout solution cavity is carried out to grouting and reinforcing, but all near solution cavity diaphragm wall, effectively do not process, layout density and the depth determination method of the not mentioned injected hole at the diaphragm wall periphery, can not guarantee that slurry coat method and concrete do not run off, therefore need a kind of effective job practices after near sealing solution cavity diaphragm wall improves badly.
Summary of the invention
For defect of the prior art, the job practices that the purpose of this invention is to provide near the solution cavity sealing of a kind of karst strata groove inside of continuous underground wall, overcome slip casting proportioning theoretical foundation deficiency in prior art, cause slurry coat method and the major defects such as concrete a large amount of waste, pollution surrounding enviroment, and have the Karst Geological Landscape problem for the diaphragm wall near zone.The method can reduce the cement paste materials, saves engineering resource, shortens cement-silicate slurries time of setting, improves efficiency of construction, and the protection surrounding enviroment, guarantee the intensity after the slip casting slurry condenses, and guarantees that engineering safety carries out.
For realizing above purpose, the invention provides near the job practices of the solution cavity sealing of a kind of karst strata groove inside of continuous underground wall, described method comprises the steps:
The first step, solution cavity condition survey: utilize boring method to set prospecting boring, determine the distributing position and size, karst erosion degree separately of solution cavity, analyze stratum and karst and the crack situation of initial injected hole, the judgement residing groundwater environment of solution cavity and watery.
Preferably, described boring method is to utilize triangle boring tower and geological drilling rig equipment to set prospecting boring, takes core to be carried out after core the karst area geologic prospecting method of integrality and Continuity Analysis.
Preferably, 1m place, the described prospecting hole spacing diaphragm wall outside distributes along diaphragm wall, and the described prospecting spacing of wells is 10m, and described prospecting drilling depth is that diaphragm wall is spent and added 2m again the most deeply.
Second step, pump drainage karst water: the watery of definite solution cavity according to the first step exists the solution cavity that a large amount of karst water is filled to adopt 1. pump drainage karst water of step; Solution cavity includes karst water and adopts less step 2. to carry out pump drainage, concrete:
1. the solution cavity that exists a large amount of karst water to fill: utilize the karst water in water pump pump drainage solution cavity by initial injected hole, splash the variation of solution cavity middle water level simultaneously: if SEA LEVEL VARIATION is clean by the karst water pump drainage in solution cavity; If the pump process middle water level does not change, should stop immediately pump drainage, and increase and append injected hole at this initial injected hole periphery.
Prospecting boring when preferably, described initial injected hole is investigation solution cavity situation.
Preferably, the described injected hole that appends is the injected hole increased at initial injected hole periphery, and its position with described initial injected hole is the blossom type layout, and the described injected hole spacing of appending is 2.0m and liftoff lower diaphragm wall 0.5m.
2. to include karst water few for solution cavity: by initial injected hole, utilize water pump that the karst water pump drainage in solution cavity is clean.
First filler in the 3rd step, solution cavity: according to karst water pump drainage degree in second step, the clean solution cavity for the karst water pump drainage, the mode of taking pressure to blow filling is carried out first filler by initial injected hole in solution cavity, and institute's filler is the sandstone that fine sand or particle diameter are 10-30mm; For the karst water clean solution cavity of pump drainage not, the mode of taking pressure to blow filling is by initial injected hole and append injected hole and carry out first filler in solution cavity, and institute's filler is the building stones that particle diameter is 50-100mm; First packed height is half of solution cavity height.
Preferably, described pressure blow fill be filler by funnel and sleeve pipe, the current that are at least 0.2MPa by hydraulic pressure enter the preprocess method before the solution cavity slip casting of solution cavity.
The 4th step, first two fluid grouting are reinforced: carry out cement-silicate biliquid slurry grouting and reinforcing after filler at each injected hole place.
Preferably, the proportioning of described cement-silicate biliquid slurry is that the volume ratio of cement paste and water glass is 4:1, and water glass proportion is 1.125g/ml, cement pulp-water grey matter amount proportioning is 0.8:1, the cement paste mixing adopts 32.5 grades of Portland cements, grouting pressure is controlled at 0.1-0.4MPa, and injection speed is 30-70L/min; Described cement-silicate biliquid slurry grouting volume is first packing volume 2/3rds, to guarantee it, seals the whole border of first filler.
The 5th step, secondary filler and secondary two fluid grouting are reinforced: after slurries and filler condense and form solid, repeat the 3rd step until filler is full of the solution cavity height, repeat the 4th step and carry out biliquid and starch slip casting and seal whole border.
The 6th step, after completing the cement-silicate two fluid grouting and sealing whole border, then adopt cement paste to carry out compaction grouting, reach the technical bid criterion that stops slip casting and stop slip casting, otherwise carry out slip casting again behind clear hole.
Preferably, described compaction grouting is to utilize the pressure that is not more than 0.5MPa, pours into the cement paste that concentration is large, match ratio is 1:1; The surrounding soil hole is then infiltrated in the large space of the first filling of slurries when described compaction grouting starts under pressure.
Preferably, the described technical standard that stops slip casting being divided into two kinds of situations, and below meeting, any one can stop slip casting: 1. the inlet well basement rock is complete, and the injected hole mouth pressure maintains 0.2-0.5MPa, and continuous 30 minutes, the midge amount is less than 40L/min; 2. repeatedly slip casting, aperture pressure surpasses 115MPa, and the single hole grouting amount reaches average grouting amount 115-210 doubly, and grout absorption obviously reduces.
The 7th step, after slip casting finishes to extract Grouting Pipe, use immediately the cement mortar sealing of hole; After sealing of hole, the solution cavity that is positioned at this injected hole periphery has completed sealing.
The 8th step, solution cavity regulation effect check: 2-3 in week after end-of-job drills through at random 1 and appends prospecting boring, inspection karst encapsulation situations with boring method 1m distance around initial injected hole is interior; If any the incomplete solution cavity of sealing, recycle this and append prospecting boring, by the 3rd step to the seven steps, solution cavity is sealed again, until the solution cavity of diaphragm wall perimeter zone seals fully.
Preferably, the incomplete solution cavity of described sealing is the solution cavity that the integrated degree according to core after boring coring is less than 85%.
Compared with prior art, the present invention has following beneficial effect:
The present invention is directed to foundation ditch diaphragm wall near zone and have the Karst Geological Landscape problem; a kind of job practices that is applicable near the various types of solution cavities of the sealing foundation ditch diaphragm wall is provided; effectively shorten the engineering time; improve efficiency of construction; and guarantee that foundation ditch is after the present invention processes; promote the safety of follow-up working procedure, save cement paste consumption and protection of the environment greatly.
The accompanying drawing explanation
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is the grouting method operation schematic diagram in the embodiment of the present invention;
Fig. 2 is the slip casting cloth hole floor map in the embodiment of the present invention;
Fig. 3 appends slip casting cloth hole floor map in the embodiment of the present invention again.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
The present embodiment provides near the job practices of the solution cavity sealing of a kind of karst strata groove inside of continuous underground wall, for planning to build a subway station in certain place, outsourcing total length in station is 200m, the diaphragm wall degree of depth is 12.5m, in zone, karst is grown fully, around the foundation ditch diaphragm wall, needs to adopt the job practices of sealing solution cavity to be processed Karst Geological Landscape, guarantees that follow-up construction safety carries out effectively, as shown in Figure 1, the Specific construction step is summarized as follows the grouting construction method step:
The first step, the solution cavity condition survey
Liftoff lower diaphragm wall outside 1m distance, utilize triangle boring tower and geological drilling rig equipment to set the prospecting boring that 14.5m is dark, finds that, about the position of the below ground 12m degree of depth, there is more karst water the solution cavity position, and groundwater table is about 11.5m.
Second step, pump drainage karst water
By prospecting, hole, i.e. karst water in the initial outside pump drainage solution cavity of injected hole, the SEA LEVEL VARIATION of observing its karst water, after finding to continue to extract the about 30min of water level, groundwater table maintains below ground 11.5m all the time, does not obviously descend; Stop pump drainage karst water, and set up and append injected hole to the diaphragm wall direction near initial injected hole, as shown in Figure 2, appending the injected hole diameter is 100mm, and apart from diaphragm wall 0.5m, appending injected hole distance each other is 2m.
The 3rd step, first filler in solution cavity
By to initial injected hole with append injected hole and fill with and to fill out the building stones that particle diameter is 50-100mm, packed height is 1/2nd of solution cavity height.
The 4th step, first two fluid grouting is reinforced
Carry out cement-silicate biliquid slurry slip casting closed boundary at each injected hole, wherein: the proportioning of cement-silicate biliquid slurry is that the volume ratio of cement paste and water glass is 4:1, water glass proportion is 1.125g/ml, cement pulp-water grey matter amount proportioning is 0.8:1, the cement paste mixing adopts 32.5 grades of Portland cements, grouting pressure is controlled at 0.1-0.4MPa, and injection speed is controlled at the 50L/min left and right.Certainly, can be also in other embodiments any injection speed in 30-70L/min.
The 5th step, secondary filler and secondary two fluid grouting are reinforced
Approximately, after 15 minutes, slurries and building stones condense into the solid with some strength, repeat the 3rd step again to initial injected hole with append injected hole and fill with and to fill out the building stones that particle diameter is 50-100mm, and whole solution cavity is filled up; Then repeat the 4th step and carry out cement-silicate biliquid slurry grouting and reinforcing closed boundary at each injected hole.
The 6th step, adopt cement paste to carry out compaction grouting, and the cement paste water/binder ratio is 1:1, and grouting pressure is 0.3MPa; Find that this injected hole mouth pressure maintains 0.4MPa, within continuous 35 minutes, the midge amount is less than 40L/min, and the inlet well basement rock is complete, meets the technical standard that stops slip casting, stops slip casting.
The 7th step, after slip casting finishes to extract Grouting Pipe, use M7.5 cement mortar sealing of hole immediately; After sealing of hole, the solution cavity that is positioned at this injected hole periphery completes sealing.
The 8th step, the solution cavity regulation effect checks:
After end-of-job, 2-3 is in week, with boring method 1m distance around initial injected hole is interior, drills through at random 1 and appends prospecting boring, checks and finds that the integrated degree of core is 50% after this place's karst boring coring, illustrates that this place's solution cavity is not closed; As shown in Figure 3, repeat the 3rd step to the seven steps and utilize this to append prospecting boring solution cavity is herein sealed to processing, until the solution cavity of diaphragm wall perimeter zone seals fully.
Near the job practices of the solution cavity sealing described a kind of karst strata groove inside of continuous underground wall of the present embodiment; construction characteristic for diaphragm wall in karst area; effectively prevent that slurry coat method from leaking out to Cave on every side; the computation of mud consumption does not reduce approximately 45% when taking the art of this patent; effectively prevent Concrete Leakage cavern, protection surrounding enviroment extremely on every side; and the quickening construction progress, significantly improved the economic benefit of engineering.
Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (8)
1. near the job practices of the solution cavity sealing of karst strata groove inside of continuous underground wall, is characterized in that, described method comprises the steps:
The first step, solution cavity condition survey: utilize boring method to set prospecting boring, determine the distributing position and size, karst erosion degree separately of solution cavity, analyze stratum and karst and the crack situation of initial injected hole, the judgement residing groundwater environment of solution cavity and watery;
Second step, pump drainage karst water: the watery of definite solution cavity according to the first step exists the solution cavity that a large amount of karst water is filled to adopt 1. pump drainage karst water of step; Solution cavity includes karst water and adopts less step 2. to carry out pump drainage, concrete:
1. the solution cavity that exists a large amount of karst water to fill: utilize the karst water in water pump pump drainage solution cavity by initial injected hole, splash the variation of solution cavity middle water level simultaneously: if SEA LEVEL VARIATION is clean by the karst water pump drainage in solution cavity; If the pump process middle water level does not change, stop immediately pump drainage, and increase and append injected hole at this initial injected hole periphery;
2. to include karst water few for solution cavity: by initial injected hole, utilize water pump that the karst water pump drainage in solution cavity is clean;
The 3rd step, first filler in solution cavity: according to karst water pump drainage degree in second step, the clean solution cavity for the karst water pump drainage, the mode of taking pressure to blow filling is carried out first filler by initial injected hole in solution cavity, and institute's filler is the sandstone that fine sand or particle diameter are 10-30mm; For the karst water clean solution cavity of pump drainage not, the mode of taking pressure to blow filling is by initial injected hole and append injected hole and carry out first filler in solution cavity, and institute's filler is the building stones that particle diameter is 50-100mm; First packed height is half of solution cavity height;
The 4th step, first two fluid grouting is reinforced: carry out cement-silicate biliquid slurry grouting and reinforcing after filler at each injected hole place;
The 5th step, secondary filler and secondary two fluid grouting are reinforced: after slurries and filler condense and form solid, repeat the 3rd step until filler is full of the solution cavity height, repeat the 4th step and carry out biliquid and starch slip casting and seal whole border;
The 6th step, after completing the cement-silicate two fluid grouting and sealing whole border, then adopt cement paste to carry out compaction grouting, reaches the technical bid criterion that stops slip casting and stop slip casting, otherwise carry out slip casting again behind clear hole;
The 7th step, after slip casting finishes to extract Grouting Pipe, use the cement mortar sealing of hole immediately; After sealing of hole, the solution cavity that is positioned at this injected hole periphery has completed sealing;
The 8th step, the solution cavity regulation effect checks: 2-3 in week after end-of-job drills through at random 1 and appends prospecting boring, inspection karst encapsulation situations with boring method 1m distance around initial injected hole is interior; If any the incomplete solution cavity of sealing, recycle this and append prospecting boring, by the 3rd step to the seven steps, solution cavity is sealed again, until the solution cavity of diaphragm wall perimeter zone seals fully.
2. near the job practices that a kind of karst strata groove inside of continuous underground wall according to claim 1, solution cavity seals, it is characterized in that, in step 1, described boring method is to utilize triangle boring tower and geological drilling rig equipment to set prospecting boring, takes core to be carried out after core the karst area geologic prospecting method of integrality and Continuity Analysis; 1m place, the described prospecting hole spacing diaphragm wall outside distributes along diaphragm wall, and the described prospecting spacing of wells is 10m, and described prospecting drilling depth is that diaphragm wall is spent and added 2m again the most deeply.
3. near the job practices of solution cavity sealing a kind of karst strata groove inside of continuous underground wall according to claim 1, is characterized in that, in step 2, and prospecting boring when described initial injected hole is investigation solution cavity situation; The described injected hole that appends is the injected hole increased at initial injected hole periphery, and its position with described initial injected hole is the blossom type layout, and the described injected hole spacing of appending is 2.0m and liftoff lower diaphragm wall 0.5m.
4. near the job practices that a kind of karst strata groove inside of continuous underground wall according to claim 1, solution cavity seals, it is characterized in that, in step 3, described pressure blow fill be filler by funnel and sleeve pipe, the current that are at least 0.2MPa by hydraulic pressure enter the preprocess method before the solution cavity slip casting of solution cavity.
5. near the job practices that a kind of karst strata groove inside of continuous underground wall according to claim 1, solution cavity seals, it is characterized in that, in step 4, the proportioning of described cement-silicate biliquid slurry is that the volume ratio of cement paste and water glass is 4:1, and water glass proportion is 1.125g/ml, cement pulp-water grey matter amount proportioning is 0.8:1, and the cement paste mixing adopts 32.5 grades of Portland cements, grouting pressure is controlled at 0.1-0.4MPa, and injection speed is 30-70L/min; Described cement-silicate biliquid slurry grouting volume is first packing volume 2/3rds, to guarantee it, seals the whole border of first filler.
6. according near the job practices of the solution cavity sealing described a kind of karst strata groove inside of continuous underground wall of claim 1-5 any one, it is characterized in that, in step 6, described compaction grouting is to utilize the pressure that is not more than 0.5MPa, pours into the cement paste of 1:1; The surrounding soil hole is then infiltrated in the large space of the first filling of slurries when described compaction grouting starts under pressure.
7. near the job practices that a kind of karst strata groove inside of continuous underground wall according to claim 6, solution cavity seals, it is characterized in that, in step 6, the described technical standard that stops slip casting being divided into two kinds of situations, below meeting, any one can stop slip casting: 1. the inlet well basement rock is complete, the injected hole mouth pressure maintains 0.2-0.5MPa, and continuous 30 minutes, the midge amount is less than 40L/min; 2. repeatedly slip casting, aperture pressure surpasses 115MPa, and the single hole grouting amount reaches average grouting amount 115-210 doubly, and grout absorption obviously reduces.
8. the job practices of sealing according near the solution cavity described a kind of karst strata groove inside of continuous underground wall of claim 1-5 any one, it is characterized in that, in step 8, the incomplete solution cavity of described sealing is the solution cavity that the integrated degree according to core after boring coring is less than 85%.
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