CN101270666B - Tunnel influence geological condition section-expanding horizontal drilling estimation and prediction method - Google Patents
Tunnel influence geological condition section-expanding horizontal drilling estimation and prediction method Download PDFInfo
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- CN101270666B CN101270666B CN2008100477335A CN200810047733A CN101270666B CN 101270666 B CN101270666 B CN 101270666B CN 2008100477335 A CN2008100477335 A CN 2008100477335A CN 200810047733 A CN200810047733 A CN 200810047733A CN 101270666 B CN101270666 B CN 101270666B
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Abstract
The invention discloses a horizontal drilling prediction method of the expanded section of front geological condition of a tunnel face. In the tunneling process of a tunnel (1), the section (2) is expanded. Spy holes (3) are evenly arranged on the expanded section (2). The spy holes are drilled in the direction of tunnel axes. When the tunnel is tunneled to the position 5 to 20m from the bottom of a probe hole (5), the section (2) of stretch is expanded. The procedure is repeated until the tunnel (1) is tunneled through. The prediction method of the invention has the advantages that the method does not affect the tunneling construction, drilling work load is small, and detection range is wide and the detection of the expanded section of front geological condition of the tunnel face can be continuous, so detected information become more detailed and correct.
Description
Technical field
The present invention relates to geological prospecting, relate in particular to the exploration of tunnel tunnel face front geological condition.
Background technology
The greatest danger of construction of tunnel construction is: the landslide in the tunnel, water burst, gush mud, gush sand, disaster such as rock burst, gas explosion, these disasters be that geological condition because of the tunnel tunnel face front complexity causes.If mishandling to disaster, not only can cause the tunnel piercing difficulty, construction delay increases investment, even can cause device damage and casualties.The main cause that these situations take place is that the hydrogeological situation shortage of tunnel tunnel face front accurately and is comprehensively understood, and engineering design has the part that do not conform to actual conditions, does not take preventive action targetedly.For reducing the constructing tunnel risk, guarantee construction safety, must strengthen forecast, obtain directly perceived, accurate, continuous geological information, and in time adjust job practices and take corresponding technical measures according to geology, hydrology variation to tunnel tunnel face front hydrogeology situation.
The method that the tunnel tunnel face front geological condition is surveyed in existing advance borehole is: establish several inspecting holes on tunnel tunnel face, one of them inspecting hole is located at the centre of face, this inspecting hole is drilled along tunnel axis, all the other inspecting holes are arranged on the periphery of face equably, drill to external radiation, its hole baselap goes out outer 3～5 meters of tunnel excavation outline line, to verify the geological condition of the outer basic laccolite of certain limit of excavated section.
The concrete drilling method of periphery inspecting hole is:
Tunnel tunnel face front is a detection range for 30～50 meters, establishes a monitoring section at least for 10～15 meters in every detection range, and each monitoring section guarantees to have 5～8 inspecting holes; According to the relative position of the distance of tunnel tunnel face and monitoring section, inspecting hole starting point and inspecting hole bottom, calculate the probing angle and drill, inspecting hole in the middle of adding, each monitoring section has 6～9 inspecting holes; The rate of penetration of corresponding each mileage points, bore quarrel or core, draining situation, creep into and specifically feel to carry out detail record and carry out analysis-by-synthesis, obtain the basic laccolite geological condition of a monitoring section.Therefore, in one 30～50 meters advance geologic bore detecting scopes, can only survey 3～5 monitoring sections, judge the front geological situation according to the analysis result of these 3～5 monitoring sections again.
The weak point that tunnel tunnel face front geological condition method is surveyed in existing advance borehole is: (1) is surveyed discontinuous, and there is spacing in each monitoring section, and the detection of tunnel tunnel face front geological condition is discontinuous, the accuracy that infringement is surveyed.(2) the probing workload is big, for satisfying in per 10～15 meters scopes a monitoring section is arranged, and then surveys 200 meters distances and needs up to a hundred inspecting holes of probing, and accumulative total inspecting hole length reaches thousands of rice.(3) because inspecting hole is to drill on tunnel tunnel face, can't carry out simultaneously, influence construction speed with tunnel work.(4) detection range is short, on the tunnel excavation section, can only survey the distance of 30～50 meters of front of tunnel heading.
Summary of the invention
The objective of the invention is: tunnel tunnel face front geological condition section-expanding horizontal drilling prediction method is provided.This prediction method is less to the influence of the tunneling construction in tunnel, and the probing workload is little, and detection range is long, and the detection of tunnel tunnel face front geological condition is had continuity, makes the information that detects more in detail and accurate.
In order to achieve the above object, the present invention adopts following technical scheme:
In a, the tunnel excavating process, when driving the place ahead need be surveyed, enlarge section in this location, the scope of expansion is: horizontal drill is executed does not influence tunnel (1) driving when boring, satisfy inspecting hole and can be laid on the minimum critical test surface;
B, on the section after the expansion, 5 inspecting holes evenly are set;
C, 5 inspecting holes are all along the probing of tunnel axis direction, and the degree of depth of probing is the drilling depth that horizontal drill can reach, and is 200～400 meters at present;
D, drilling process is carried out record, judge front geological condition according to the engineering geological drilling standard;
If when the e front geological condition is unfavorable for tunnel (1) driving, handle according to engineering discipline earlier, continue tunnel (1) driving then;
If there is not the situation that is unfavorable for tunnel (1) driving in the f front geological condition, then tunnel (1) driving to preceding inspecting hole bottom (5) is differed from 5～20 meters;
G, repeating step a～f, (1) is got through up to the tunnel.
Compared with prior art, advantage of the present invention is:
1, once executes the geological condition that 200～400 meters of tunnel tunnel face fronts could be surveyed and forecast to brill, be far longer than 30～50 meters distances of existing detection method;
2, survey and forecast the geological condition of same distance, the probing cumulative length significantly reduces than prior art;
3, can survey the geological condition of forecast tunnel tunnel face front intuitively, continuously, improve the discontinuous situation of geology detecting in the prior art;
4, because of the inspecting hole arranged all on the section after the expansion, so when probing, do not influence the normal construction in tunnel, improve efficiency of construction;
5, the engineering quantity of increase can be reduced effectively as the required expansion section of inspecting hole in can utilize refuge chamber, the electrification railway contact net section of casting anchor, highway in the design to grow up location that the section of stopping in emergency in the tunnel etc. just needs to enlarge section originally.
6, the present invention grows the area to karst, and the value of forecasting of geological conditions such as solution cavity, lapies, fluid bowl is especially remarkable.
Description of drawings
Fig. 1 is the schematic diagram of tunnel tunnel face front geological condition section-expanding horizontal drilling prediction method of the present invention.
Fig. 2 is the existing schematic diagram of surveying the tunnel tunnel face front geological condition.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Embodiment one:
As shown in Figure 1, tunnel tunnel face front geological condition section-expanding horizontal drilling prediction method of the present invention follows these steps to carry out:
In a, tunnel 1 tunneling process, when driving the place ahead need be surveyed, enlarge section 2 in this location, the scope of expansion is: horizontal drill is executed does not influence tunnel (1) driving when boring, satisfy inspecting hole and can be laid on the minimum critical test surface;
B, on the section after the expansion 2,5 inspecting holes 3 evenly are set;
C, 5 inspecting holes are all along the probing of tunnel axis 4 directions, and the degree of depth of probing is the drilling depth that horizontal drill can reach, and is 200～400 meters at present;
D, drilling process is carried out record, judge front geological condition according to the engineering geological drilling standard;
If when the e front geological condition is unfavorable for tunnel (1) driving, handle according to engineering discipline earlier, continue tunnel (1) driving then;
If there is not the situation that is unfavorable for tunnel (1) driving in the f front geological condition, then tunnel (1) driving to preceding inspecting hole bottom (5) is differed from 5～20 meters;
G, repeating step a～f, (1) is got through up to the tunnel.
Be example with tunnel, Rong Xi speedway thin rice gruel mountain, Shanghai below, the present invention is further illustrated.
Embodiment two:
Long 1823 meters of tunnel, Rong Xi speedway thin rice gruel mountain, Shanghai is left and right sides separate tunnel, just wide open 79 meters of the cross-sectional areas that dig
2～101 meters
2The geological condition complexity, disaster geology such as karst declogging, fault belt, high-ground stress are more, and geology such as solution cavity, fluid bowl, lapies are grown, and the present invention is used in this tunnel geology forecast, and implementation result is better, and the geologic prediction situation is accurate and visual.
This tunnel tunnel face front geological condition section-expanding horizontal drilling prediction method is:
A, tunnel, Rong Xi speedway thin rice gruel mountain, Shanghai need carry out the detection and the forecast of tunnel tunnel face front geological condition when tunneling 504 meters, will be about the tunnel and height respectively enlarge 5 meters, this moment horizontal drill can execute the driving that brill does not influence the tunnel;
B, the vault on section after the expansion, left and right sides arch springing, left and right sides abutment wall bottom position are established 5 inspecting holes;
C, 5 inspecting holes are all along the probing of tunnel axis direction, and the degree of depth of probing is 260 meters (drilling depth that can reach because of at that time horizontal drill is 280 meters);
D when tunnel piercing to when enlarging 250 meters in back section, will be about this location, tunnel and height respectively enlarge 5 meters;
E, repeating step b～d.
April 15 in 2005 was successfully detected solution cavity at 704 meters, on April 21st, 2005 is after left hole driving is located to this, draw up a plan for after the scale by some other means synthetic determination solution cavity, in advance personnel's equipment is transferred to safe location, remote-controlled detonation, implemented to sluice in molten chamber, nearly 3 ten thousand stere water successfully release, without any personnel's injures and deaths and property loss.
Successfully detect the coal seam at the 978th meter, and formulated driving and supporting scheme in advance, for the change design performs data, reduced the loss that occurs the work holdup because of the change design in advance.
At 1150-1307 rice the fault belt of design prompting is successfully verified, and provided direct foundation for successfully formulating appropriate scheme by this stratum according to detection event.
Claims (1)
1. tunnel tunnel face front geological condition section-expanding horizontal drilling prediction method is characterized in that, this prediction method follows these steps to carry out:
In a, tunnel (1) tunneling process, when driving the place ahead need be surveyed, enlarge section (2) in this location, the scope of expansion is: horizontal drill is executed does not influence tunnel (1) driving when boring, satisfy inspecting hole and can be laid on the minimum critical test surface;
B, on the section after the expansion (2), 5 inspecting holes (3) evenly are set;
All along the probing of tunnel axis (4) direction, the degree of depth of probing is the drilling depth that horizontal drill can reach for c, 5 inspecting holes (3);
D, drilling process is carried out record, judge front geological condition according to the engineering geological drilling standard;
If when the e front geological condition is unfavorable for tunnel (1) driving, handle according to engineering discipline earlier, continue tunnel (1) driving then;
If there is not the situation that is unfavorable for tunnel (1) driving in the f front geological condition, then tunnel (1) driving to preceding inspecting hole bottom (5) is differed from 5～20 meters;
G, repeating step a～f, (1) is got through up to the tunnel.
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| CN101586470B (en) * | 2009-07-03 | 2011-01-26 | 中铁一局集团有限公司 | Advanced drilling method for high-pressure water-rich filling cavity |
| CN102094678B (en) * | 2009-12-11 | 2013-04-10 | 中铁十一局集团有限公司 | Method for identifying water-bursting risks in karst tunnels |
| CN102322773B (en) * | 2011-09-07 | 2013-08-21 | 中铁第四勘察设计院集团有限公司 | Ultra long blast hole detection method |
| CN102817619B (en) * | 2012-09-03 | 2014-12-10 | 中铁第四勘察设计院集团有限公司 | Combined advanced drilling exploration method for detecting water-free dissolving cavity and water dissolving cavity in tunnel |
| CN103603669A (en) * | 2013-11-29 | 2014-02-26 | 上海建工集团股份有限公司 | Unfavorable geology forecasting device for shield tunnel and tunnel construction method |
| CN103866780B (en) * | 2014-03-28 | 2016-01-06 | 中国水电顾问集团贵阳勘测设计研究院有限公司 | A kind of construction method of carrying out quick seepage preventing curtain grouting in karst blowby area |
| CN104806256B (en) * | 2015-04-16 | 2017-03-15 | 粤水电轨道交通建设有限公司 | A kind of shield is prominent to meet processing method in molten chamber hole |
| SE540915C2 (en) * | 2017-02-27 | 2018-12-18 | Epiroc Rock Drills Ab | Method and system for generating a drilling pattern, a computer program, a computer-readable medium and a rock drilling rig |
| CN107588750A (en) * | 2017-07-10 | 2018-01-16 | 中铁二院工程集团有限责任公司 | A kind of method suitable for deep tunnel face country rock overall process deformation monitoring |
| CN108316929A (en) * | 2018-01-29 | 2018-07-24 | 中国水利水电第十工程局有限公司 | A kind of water conservancy and hydropower gas Tunnel Construction |
| CN109736796B (en) * | 2019-03-04 | 2022-09-13 | 中铁十六局集团有限公司 | Advanced detection mechanism for deepening blast hole and prediction method thereof |
| CN110306987B (en) * | 2019-06-24 | 2021-05-25 | 中铁十二局集团有限公司 | Drainage tunnel coal uncovering and outburst prevention construction method |
| CN110939454A (en) * | 2019-11-14 | 2020-03-31 | 中国地质大学（武汉） | Advanced geological prediction method for tunnel more than kilometer |
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