CN103046537B - Method for plugging exploratory holes above karst caves - Google Patents
Method for plugging exploratory holes above karst caves Download PDFInfo
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- CN103046537B CN103046537B CN201210563813.2A CN201210563813A CN103046537B CN 103046537 B CN103046537 B CN 103046537B CN 201210563813 A CN201210563813 A CN 201210563813A CN 103046537 B CN103046537 B CN 103046537B
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Abstract
The invention discloses a method for plugging exploratory holes above karst caves. The method includes the steps of manufacturing a soft cup-shaped plug, placing the plug, preparing cement mortar, grouting the cement mortar by grouting the prepared cement mortar into a drill hole via a mortar guide tube till a bed rock surface, lifting the mortar guide tube while grouting the mortar; lifting up the mortar guide tube after the mortar if fully grouted, enabling the cement mortar to solidify for 30 minutes; detecting quality of the mortar sealed hole via heavy dynamic sounding, changing a tapered dynamic probe to a flat-base probe, continuously hammering for 5 times, recording penetration degree; and sealing the hole by covering a soil layer according to the theory of 'soil for soil, and sand for sand' after the sealed hole is detected to be qualified. The method for plugging the exploratory holes above the karst caves is capable of solving the problem about secondary geological disaster like karst ground depression caused by the exploratory hole, and filling the blank in the field of domestic geotechnical engineering investigation.
Description
Technical field
The present invention relates to geotechnical investigation (civil engineering) technical field, more particularly it is a kind of solvable karst cave top exploratory hole method for blocking.
Background technology
In fields such as engineering construction and mine locatings, exploratory hole method for blocking is an important process in geological prospecting.Up to now, water conservancy industry has formed ripe clay ball method for sealing and cement mortar method for sealing, and is widely used in dam construction geological mapping.Clay ball method for sealing is mainly used in Geological Investigation of Dike Engineering, avoids causing dyke that seepage failure occurred in flood season because of exploration; Cement mortar method for sealing is mainly used in dam engineering geological mapping, prevents that the dam foundation is because of the larger uplift pressure of exploration generation.
Mine locating industry adopts the loose method for sealing of Mary, mainly solves the problems such as leakage shutoff of the underground water, oil, gas of high pressure.
Can lava Distribution Area, karst ground subsidence be a kind of common geological disaster.Produce karst ground subsidence reason and can be divided into internal cause and external cause, internal cause is in lava, to grow solution cavity, and has the passage being communicated with covering layer; External cause has natural cause (groundwater activities etc.) and human factor (artificial groundwater abstraction, boring, piling etc.).
Can carry out geological mapping work in lava area, a very important job will prevent exactly because exploratory bore-hole causes karst ground subsidence, avoids staying because of exploration the hidden danger of karst ground subsidence, causes the generation of the disaster of subsiding, and causes the problems of geo-environment.Therefore, shutoff exploratory bore-hole how timely and effectively after exploration completes, and the natural cycling condition that makes it not affect underground water is a problem that is worth research.
The present invention be can lava area meet the method for blocking of exploratory hole in solution cavity situation, can effectively solve the generation of bringing out the Secondary Geological Hazards such as karst ground subsidence because of exploratory hole, filled up the blank of domestic geotechnical investigation field this respect.
Summary of the invention
The object of the invention is to overcome the weak point of above-mentioned existing background technology, and a kind of solvable karst cave top exploratory hole method for blocking is provided.
The object of the invention is to reach by following measure: solvable karst cave top exploratory hole method for blocking, is characterized in that it comprises the steps:
(1) making of flexible cup type embolism: adopt natural rubber to make embolism;
(2) place embolism: utilize rig power, with drilling rod, embolism being headed in boring to solution cavity top is complete by aperture can lava position, for guaranteeing that embolism is sent to precalculated position exactly, firmly should be even, speed should be slowly;
(3) cement mortar preparation: in early strength admixture: the ratio of structure glue: cement: sand: water=1:1:10:15:4 is prepared cement mortar;
(4) cement injection mortar: will lead slurry pipe and put into boring, and lead the outlet of slurry pipe and be advisable apart from embolism end face 10cm;
(5), by leading slurry pipe by the cement mortar injection hole preparing, till bedrock surface, marginal not slurry limit promotes leads slurry pipe;
(6), after slip casting completes, be lifted out and lead slurry pipe, and make cement mortar solidify 30min;
(7) adopt heavy dynamic penetration to check mortar sealing quality, change pyramid type dynamic sounding head into flat probe, 5 continuous hammerings, record pile penetration;
(8) sealing of hole detect qualified after, upper overburden layer carries out sealing of hole by the principle of " with native earth backing, with sand sand also ".
In technique scheme, described cup-shaped height H equals 25% of bore diameter, and column height H 1 equals 15% of bore diameter, and cup top diameter D1 equals 110% of bore diameter, and cup end diameter D2 equals 90% of bore diameter; Cup internal diameter R=2.5cm, cup dark H2=1.9cm(φ 110 apertures) or 1.6cm(φ 91 apertures); The thick L=3.6cm(φ of wall of cup 110 apertures) or 2.5cm(φ 91 apertures).
In technique scheme, described early strength admixture is complex accelerator, and match ratio is: 75.1% industrial sulphuric acid sodium+0.9% 3 ethanol peace+9.0%TE exciting agent+15.0% naphthalene acid iodide formaldehyde condensation products water reducing agent; Described structure glue performance indications (7.4% glue+73.5% cement+19.1% water): compressive strength >=50MPa, shear strength >=24MPa, glue-old mortar bonding hot strength >=2.5MPa, glue-old mortar adhesive shear strength >=1.5MPa; Cement is 32.5 grades of Portland cements.
In technique scheme, the performance indications of described elastomeric material are: breaking strength >=16MPa, elongation at break % >=450,300% fixed stretching strength >=12MPa, hardness Shao Er A68, impact elasticity >=45%, rubber and metal adhesion 15KN/m.
In the exploratory hole method for blocking of the solvable karst cave of the present invention top, sealing of hole embolism has the feature of environmental protection, flexibility, and the shape of embolism and specification have technical performances such as being easily placed into precalculated position, easy and hole wall strong bonded; Cement mortar has rapid hardening, high strength, do not shrink after solidifying, easily and the feature such as hole wall bonding; Cement mortar sealing quality detection method is easy and simple to handle, do not damage the cement mortar that sealing of hole has solidified, and can form sealing quality examination criteria;
The flexible cup of the present invention type embolism adopts natural rubber material, the common environmental protection of material; Ke factory processes in batch, simple for production; Through test, embolism is 500KPa to the maximum ring-type tension force of limestone hole wall and frictional force sum, can bear top mortar and filled load; The flexibility that tool is certain, can send to precalculated position smoothly;
By the present invention, can set up the solvable karst cave top exploratory hole method for blocking of a set of practicability and effectiveness, easy and simple to handle, economic environmental protection.
Accompanying drawing explanation
Fig. 1 is in April, 2011-2011 year Wuhan subway probing in October sealing quality qualification rate broken line graph.
Fig. 2 is the structural representation of sealing of hole embolism of the present invention.
Fig. 3 is exploratory hole shutoff process schematic diagram of the present invention.
1. covering layers in figure; 2. can lava; 3. solution cavity; 4. boring; 5. embolism; 6. cement mortar; With native earth backing, with sand sand also; H. cup-shaped height; H1. column height; D1. cup top diameter; D2. cup the end diameter; R. cup internal diameter; H2. cup is dark; L. wall of cup is thick.
The specific embodiment
Below in conjunction with accompanying drawing, describe performance of the present invention in detail, but they do not form limitation of the invention, only for example.Simultaneously by illustrating that advantage of the present invention will become more clear and easily understand.
Consult accompanying drawing 2, Fig. 3 is known: the solvable karst cave of the present invention top exploratory hole method for blocking, it comprises the steps:
(1) making of flexible cup type embolism: adopt natural rubber to make embolism;
(2) place embolism: utilize rig power, with drilling rod, embolism being headed in boring to solution cavity top is complete by aperture can lava position, for guaranteeing that embolism is sent to precalculated position exactly, firmly should be even, speed should be slowly;
(3) cement mortar preparation: in early strength admixture: the ratio of structure glue: cement: sand: water=1:1:10:15:4 is prepared cement mortar;
(4) cement injection mortar: will lead slurry pipe and put into boring, and lead the outlet of slurry pipe and be advisable apart from embolism end face 10cm;
(5), by leading slurry pipe by the cement mortar injection hole preparing, till bedrock surface, marginal not slurry limit promotes leads slurry pipe;
(6), after slip casting completes, be lifted out and lead slurry pipe, and make cement mortar solidify 30min;
(7) adopt heavy dynamic penetration to check mortar sealing quality, change pyramid type dynamic sounding head into flat probe, 5 continuous hammerings, record pile penetration;
(8) sealing of hole detect qualified after, upper overburden layer carries out sealing of hole by the principle of " with native earth backing, with sand sand also ".
Described cup-shaped height H equals 25% of bore diameter, and column height H 1 equals 15% of bore diameter, and cup top diameter D1 equals 110% of bore diameter, and cup end diameter D2 equals 90% of bore diameter; Cup internal diameter R=2.5 cm, cup dark H2=1.9cm(φ 110 apertures) or 1.6cm(φ 91 apertures); The thick L=3.6cm(φ of wall of cup 110 apertures) or 2.5cm(φ 91 apertures).
Described early strength admixture is complex accelerator, and match ratio is: 75.1% industrial sulphuric acid sodium+0.9% 3 ethanol peace+9.0%TE exciting agent+15.0% naphthalene acid iodide formaldehyde condensation products water reducing agent; Described structure glue performance indications (7.4% glue+73.5% cement+19.1% water): compressive strength >=50MPa, shear strength >=24MPa, glue-old mortar bonding hot strength >=2.5MPa, glue-old mortar adhesive shear strength >=1.5MPa; Cement is 32.5 grades of Portland cements.
The performance indications of described elastomeric material are: breaking strength >=16MPa, elongation at break % >=450,300% fixed stretching strength >=12MPa, hardness Shao Er A68, impact elasticity >=45%, rubber and metal adhesion 15KN/m.
The present invention adopts heavy dynamic penetration to check mortar sealing quality, changes pyramid type dynamic sounding head into flat probe, and 5 continuous hammerings, record pile penetration; Adopt heavy dynamic penetration to carry out nondestructive testing to rock section sealing quality, according to result of the test, detection quality specifications is got 5 and is hit pile penetration 2cm, is less than 2cm qualified, is more than or equal to 2cm defective.
Heavy dynamic penetration carries out nondestructive testing, after cement mortar has been poured into, after 30min, carries out, and according to result of the test, determines quality specifications.
Through test, consistency of mortar is 8～12cm, and quick setting and high strength cement mortar is easy to perfusion, initial set 5min, final set 15min, compressive strength 3.5MPa, shear strength 1.5MPa, with the shear strength 0.5MPa of grey scar, intensity meets the demands, and 30min can detect after grout pouring, than routine operation, can save for approximately 98% time, time-saving and efficiency.
Consult Fig. 1 known: by the probing sealing quality of the projects such as the special prospecting of Wuhan Rail Transit Hanyang District karst is detected, adopt after the exploratory hole method for blocking of the solvable karst cave of the present invention top, probing sealing quality qualification rate, than front having improved tens percentage points, has reached more than 97%.
Claims (5)
1. solvable karst cave top exploratory hole method for blocking, is characterized in that it comprises the steps:
(1) making of flexible cup type embolism: adopt natural rubber to make embolism;
(2) place embolism: utilize rig power, with drilling rod, embolism being headed in boring to solution cavity top is complete by aperture can lava position, for guaranteeing that embolism is sent to precalculated position exactly, firmly should be even, speed is slow;
(3) cement mortar preparation: in early strength admixture: the ratio of structure glue: cement: sand: water=1:1:10:15:4 is prepared cement mortar;
(4) cement injection mortar: will lead slurry pipe and put into boring, leading the outlet of slurry pipe is 10cm apart from embolism end face;
(5), by leading slurry pipe by the cement mortar injection hole preparing, till bedrock surface, marginal not slurry limit promotes leads slurry pipe;
(6), after slip casting completes, be lifted out and lead slurry pipe, and make cement mortar solidify 30min;
(7) adopt heavy dynamic penetration to check mortar sealing quality, change pyramid type dynamic sounding head into flat probe, 5 continuous hammerings, record pile penetration;
(8) sealing of hole detect qualified after, upper overburden layer carries out sealing of hole by the principle of " with native earth backing, with sand sand also ".
2. solvable karst cave according to claim 1 top exploratory hole method for blocking, it is characterized in that cup-shaped height H equals 25% of bore diameter, column height H 1 equals 15% of bore diameter, and cup top diameter D1 equals 110% of bore diameter, and cup end diameter D2 equals 90% of bore diameter; Cup inside radius R=2.5cm, the dark H2=1.9cm of cup or 1.6cm; The thick L=3.6cm of wall of cup or 2.5cm.
3. solvable karst cave according to claim 1 and 2 top exploratory hole method for blocking, is characterized in that described bore diameter is φ 110mm or φ 91mm.
4. solvable karst cave according to claim 1 and 2 top exploratory hole method for blocking, it is characterized in that described early strength admixture is complex accelerator, match ratio is: 75.1% industrial sulphuric acid sodium+0.9% 3 ethanol peace+9.0%TE exciting agent+15.0% naphthalene acid iodide formaldehyde condensation products water reducing agent; Described structure glue is: 7.4% glue+73.5% cement+19.1% water, the performance indications of described structure glue: compressive strength >=50MPa, shear strength >=24MPa, glue-old mortar bonding hot strength >=2.5MPa, glue-old mortar adhesive shear strength >=1.5MPa; Cement is 32.5 grades of Portland cements.
5. solvable karst cave according to claim 1 and 2 top exploratory hole method for blocking, is characterized in that the performance indications of described elastomeric material are: breaking strength >=16MPa, elongation at break >=450%, 300% fixed stretching strength >=12MPa, hardness Shao Er A68, impact elasticity >=45%, rubber and metal adhesion 15KN/m.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103437339A (en) * | 2013-07-29 | 2013-12-11 | 中铁十六局集团北京轨道交通工程建设有限公司 | Construction method for sealing karst cave near trench wall of underground continuous wall in karst stratum |
| CN104196488B (en) * | 2014-08-11 | 2016-09-14 | 姚燕明 | Underwater exploration hole hole-sealing technology |
| CN108071401A (en) * | 2016-11-10 | 2018-05-25 | 上海宝冶集团有限公司 | The construction method of karst area subway tunnel |
| CN108756809B (en) * | 2018-07-23 | 2020-10-20 | 中南大学 | Hole sealing method for shield tunnel geological exploration drilling |
| CN110056326A (en) * | 2019-04-29 | 2019-07-26 | 中铁第四勘察设计院集团有限公司 | Hole sealing structure and implementation method for drilling with bead type solution cavity |
| CN114482009A (en) * | 2022-01-27 | 2022-05-13 | 湖北工建基础设施建设有限公司 | Method for treating hole bunching phenomenon in construction of karst stratum cast-in-situ bored pile |
| CN116291306B (en) * | 2023-03-30 | 2023-09-12 | 广东省建筑设计研究院有限公司 | Hole sealing method for drilling construction in karst area |
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| US7806631B2 (en) * | 2007-04-17 | 2010-10-05 | Smith Eric W | Underground filling and sealing method |
| CN101270582B (en) * | 2007-06-01 | 2010-09-01 | 中铁西北科学研究院有限公司 | Method for setting bracing column in underground cavity |
| CN101092557A (en) * | 2007-07-16 | 2007-12-26 | 王玲 | Method and formula for plugging cracks, solution holes, hollow spaces, and pores on sub stratum |
| CN101230570A (en) * | 2008-02-20 | 2008-07-30 | 山东省交通厅公路局 | Layered multitime pressure regulating pulp conditioning casting method |
| CN101532600B (en) * | 2008-03-13 | 2013-03-13 | 中国石化集团胜利石油管理局钻井工艺研究院 | Method for leak stoppage of solid expansion pipe |
| CN201448122U (en) * | 2009-07-10 | 2010-05-05 | 中铁一局集团有限公司 | High-pressure rich-water filling solution cavity advanced boring device |
| CN102465681A (en) * | 2010-11-18 | 2012-05-23 | 常萍 | Plugging technology of ultra strong water absorption resin |
| CN102155241B (en) * | 2011-05-10 | 2013-07-31 | 广州市城市规划勘测设计研究院 | Karst grouting reinforcement water-stop constructing method |
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Address after: 430010 No. 1863 Jiefang Avenue, Jiang'an District, Hubei, Wuhan Patentee after: CHANGJIANG SURVEY PLANNING DESIGN AND RESEARCH Co.,Ltd. Patentee after: Changjiang Geotechnical Engineering Co.,Ltd. Address before: 430010 No. 1863 Jiefang Avenue, Jiang'an District, Hubei, Wuhan Patentee before: CHANGJIANG SURVEY PLANNING DESIGN AND RESEARCH Co.,Ltd. Patentee before: CHANGJIANG GEOTECHNICAL ENGINEERING Corp. |
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