CN103076636B - The real-time detecting water by pilot hole apparatus and method of constructing tunnel orientation with drilling induced polarization - Google Patents
The real-time detecting water by pilot hole apparatus and method of constructing tunnel orientation with drilling induced polarization Download PDFInfo
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Abstract
The invention discloses the real-time detecting water by pilot hole device of a kind of constructing tunnel orientation with drilling induced polarization, comprise drill bit, high-strength insulation with drill bushing cylinder and directed induced polarization exploration system, described drill bit connects high-strength insulation with drill bushing cylinder by connection bearing, lays directed induced polarization exploration system at high-strength insulation with drill bushing cylinder periphery.Present invention also offers a kind of corresponding real-time detecting water by pilot hole method of constructing tunnel orientation with drilling induced polarization.Present invention obviates the interference of construction environment, Effect on Detecting is better, improves the utilization ratio of advance borehole.The present invention realizes current oriention, breaks through hole wall place low-resistance, expands investigative range.The present invention also protects electrode, ensures electrode and the good coupling contact of Rock And Soil.
Description
Technical field
The present invention relates to a kind of orientation with drilling induced polarization exploration predictor and method in constructing tunnel process, specifically one relates in constructing tunnel process, while workplace drilling rod creeps into forward, do not affecting under the condition of creeping into, adopt directed induced polarization exploration system, the apparatus and method of real-time detection and forecast are made to the moisture situation in workplace front during constructing tunnel.
Background technology
Gushing water mud disaster of dashing forward is the significant challenge and a difficult problem that face in constructing tunnel, often causes serious economic loss and production safety problem.At Tunnel during Construction, the moisture situation verifying in face of construction working side in advance has vital role for avoiding gushing water mud disaster of dashing forward.Advanced levels probing is a kind of detecting water by pilot hole method conventional at present, by arranging 1-3 boring on tunnel front, carrying out Advance Drilling, detecting the moisture situation in front, tunnel front.Advanced levels probing is a kind of directly spy water method, if boring can directly disclose moisture tectonic structure, then can verify moisture situation accurately; If but the bore position chosen does not deposit region in moisture architectonic tax, then cannot disclose moisture tectonic structure, omit gushing water and to dash forward mud disaster source, cause wrong report.Therefore, bore detecting scope is less, only can make water content situation in boring aperture and detecting, and there is the problem of " a peephole view ".
In order to detect the moisture situation around boring in Rock And Soil, improve the investigative range of probing, in the probing of ground, people mainly adopt geophysical prospecting method in hole, as resistivity method in geological radar method, hole in seismic wave method, hole in hole etc., achieve good effect, for the problem solving tunnel front Advance Drilling provides reference.But tunnel front Advance Drilling is visited water and be there are some comparatively special problems, and the auxiliary geophysical prospecting method making ground drill cannot be applied directly in tunnel.A kind of detecting water by pilot hole predictor that the patent of application number 201210182857.0 proposes because investigation depth is low, by metallic drilling rod interference and affect relatively more serious, extensively promoted in actual applications.For the problems referred to above, the present invention proposes the real-time detecting water by pilot hole apparatus and method of the directed induced polarization of a kind of constructing tunnel.For the present invention, the particular challenge in tunnel is specific as follows: (1) constructing tunnel duration is general more urgent, keeps for the geophysical exploration time in probing and hole very limited, needs to propose a kind of real-time detection apparatus and method with boring; (2) drill bit and drilling rod are all that high-strength steel makes, very large to induced polarization exploration interference, and drill bit and drilling rod cannot directly install induced polarization exploration system, need the measurement while drilling device that design invention is special; (3) in one borehole, the induced polarization exploration degree of depth is limited, needs to propose a kind of detection form improving investigation depth; (4) data process and interpretation consuming time longer of general geophysical exploration, and Advance Drilling can provide result of detection in real time, in order to synchronous with Advance Drilling, needs to propose a kind of real time data processing and interpretation procedure.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, providing the induced polarization of a kind of constructing tunnel orientation with drilling real-time detecting water by pilot hole apparatus and method, these apparatus and method can make real-time continuous forecast to front, tunnel front water content situation.
To achieve these goals, the present invention adopts following technical scheme.
The real-time detecting water by pilot hole device of a kind of constructing tunnel orientation with drilling induced polarization, comprise drill bit, high-strength insulation with drill bushing cylinder and directed induced polarization exploration system, described drill bit connects high-strength insulation with drill bushing cylinder by connection bearing, directed induced polarization exploration system is laid with drill bushing cylinder periphery at high-strength insulation, realize Advance Drilling to carry out in real time with the synchronous of induced polarization exploration, the data gathered are by quick decomposition method, with apparent resistivity and apparent chargeability for parameter, real-time continuous forecast is made to the moisture situation in front, tunnel front.
Described directed induced polarization exploration system comprises directed transmitting electrode system and observation electrode system, and directed transmitting electrode system comprises transmitting electrode, two auxiliary power supply electrodes and plain metal electrode, and observation electrode system comprises two observation electrodes do not polarized; Described two auxiliary power supply electrodes are separately fixed at transmitting electrode both sides, and plain metal electrode is positioned at tunnel; Described observation electrode system is between transmitting electrode and an auxiliary power supply electrode, and all electrodes of directed induced polarization exploration system are all connected with on-the-spot main frame by cable.
Described two auxiliary power supply electrodes are equal with the distance of transmitting electrode.
Described observation electrode is equidistantly laid between transmitting electrode and an auxiliary power supply electrode.
When carrying out work, feed and the same sex electric current of the equal size of transmitting electrode auxiliary power supply electrode, in observation, electrode system place carries out data acquisition.Under general state, transmitting electrode transmitter current can drill directional divergence to parallel probing with vertical, and cause the linear electric current density on detection direction needed for induced polarization i.e. vertical probing direction little, investigation depth is restricted.In the present invention, auxiliary power supply electrode runs parallel is powered in probing direction, and orientable compressing transmitting electrode transmitter current is concentrated to vertical probing direction orientation, realizes current oriention, increases the strength of current on detection direction needed for induced polarization, increase investigation depth.
Described connection bearing rear end connects high-strength insulation with drill bushing cylinder with the form of draw-in groove.
Described high-strength insulation is with drill bushing cylinder, and entire body adopts high-strength PVC insulating material, and diameter is less than bore diameter, is connected with drill bit by connection bearing.Connection bearing is fixed on drill bit, rear end with draw-in groove form and high-strength insulation with boring sleeve connection.Directed induced polarization exploration system is laid in high-strength insulation with on drill bushing cylinder, and in drilling process, high-strength insulation only advances with drilling rod with drill bushing cylinder, but does not rotate with drilling rod, can ensure the stable operation of directed induced polarization exploration security of system.Metal drill pipe and directed induced polarization electrode isolation are opened with drill bushing cylinder by high-strength insulation, make induced polarization exploration by metallic drilling rod interference and affect, achieve the synchronous of Advance Drilling and directed induced polarization exploration simultaneously and carry out in real time.
In directed induced polarization exploration system, except plain metal electrode, all the other all electrodes are all for being laid in high-strength insulation with the elastic annular roller electrode on drill bushing cylinder.
Described elastic annular roller electrode, comprises elastic sheet and ball, and elastic annular roller electrode most peripheral diameter is slightly larger than bore diameter.Elastic sheet arranges groove, lays ball, frictional resistance when induced polarization exploration system is advanced can be reduced, exploring electrode is shielded.Under elastic sheet uncompressed state, elastic annular roller electrode most peripheral diameter is slightly larger than bore diameter, and after electrode enters boring, elastic sheet plays elastic reaction immediately, ensures that electrode and Rock And Soil realize good coupling contact.Set elastic annular roller electrode realizes the communication with on-the-spot main frame by cable.
In observation electrode, elastic sheet outside surface, groove and ball surface all scribble solid electrolyte, and cable tail is located in solid electrolyte.Directed transmitting electrode system does not then need to smear solid electrolyte, and cable tail directly draws own elasticity thin slice.
Present invention also offers the real-time detecting water by pilot hole method of a kind of constructing tunnel orientation with drilling induced polarization, comprise the steps:
(1) on the drill bit carrying out advanced levels probing, install connection bearing, connection bearing rear end connects high-strength insulation with drill bushing cylinder.
(2) lay directed transmitting electrode system and observation electrode system at high-strength insulation with drill bushing cylinder periphery, in described directed transmitting electrode system, two auxiliary power supply electrodes are separately fixed at transmitting electrode both sides, and plain metal electrode is positioned at tunnel; Described observation electrode system is between transmitting electrode and an auxiliary power supply electrode, and all electrodes of directed induced polarization exploration system are all connected with on-the-spot main frame by cable.
(3) carry out advanced levels probing, drill the certain depth that often advances, namely implement directed induced polarization forward probe.When not stopping creeping into, feeding the same sex electric current of equal size to transmitting electrode, auxiliary power supply electrode, forming loop with plain metal electrode, simultaneously at observation electrode place collection signal.
(4) on-the-spot main frame carries out real-time detection decipher to observation electrode collection signal, obtains visual apparent resistivity and apparent chargeability result of detection.In conjunction with results of drilling, forecast is made to front, tunnel front water content situation.
Described is carry out decipher in real time fast by signal collected for scene with brill real-time detection decomposition method, and obtain the visual apparent resistivity of investigative range and apparent chargeability: apparent resistivity is low, during apparent chargeability height, the Rock And Soil property of water-bearing of detection is strong; Apparent resistivity is high, and apparent chargeability is low, and the Rock And Soil property of water-bearing of detection is weak.In conjunction with Advance Drilling result, forecast is made to front, tunnel front water content situation.
Beneficial effect of the present invention: 1. Advance Drilling combines with directed induced polarization forward probe by the present invention, directed induced polarization exploration carries out in boring, avoids the interference of construction environment, and Effect on Detecting is better, improves the utilization ratio of advance borehole.Directed advanced induced polarization forward probe can carry out in real time with drilling process, does not need to extract drilling rod out, even do not need stopping to creep into, improve the work efficiency of front, tunnel front water content being carried out to advanced prediction in detection process.
2. the present invention uses high-strength insulation with drill bushing cylinder, directed induced polarization forward probe with drilling process is separated with Advance Drilling, high-strength insulation is connected with drill bit with connection bearing with drill bushing cylinder, in drilling process, high-strength insulation only moves forward with drill bushing cylinder and does not rotate, two kinds of methods are carried out simultaneously, but concrete operations are implemented to be separated completely, really realize the real-time detecting water by pilot hole of orientation with drilling induced polarization.
3. the present invention adopts directed induced polarization forward probe, be provided with the directed transmitting electrode system being parallel to drilling direction, transmitting electrode and auxiliary power supply electrode feed the same sex electric current of equal size simultaneously, make current convergence in vertical drilling direction, realize current oriention, break through hole wall place low-resistance, expand investigative range, effectively solve the problem of Advance Drilling " a peephole view ".Directed induced polarization exploration system uses elastic annular roller electrode, and ball can reduce the friction force in electrode advance process, plays the effect of guard electrode, and elastic sheet can ensure that electrode and Rock And Soil realize good coupling contact.
4. the present invention carries out decipher in real time fast to directed induced polarization forward probe is signal collected, according to the parameter such as apparent chargeability and apparent resistivity, in conjunction with Advance Drilling result, front, tunnel front water content is made to the advanced prediction of real-time continuous.
Accompanying drawing explanation
Fig. 1 is mounting structure schematic diagram of the present invention.
Fig. 2 is structural representation of the present invention.
Fig. 3 is drill bit of the present invention and the high-strength insulation structural representation with drill bushing cylinder.
Fig. 4 is elastic annular roller electrode three-dimensional structure diagram of the present invention.
Fig. 5 is the elastic annular roller electrode sectional view that the present invention polarizes.
Fig. 6 is the elastic annular roller electrode sectional view that the present invention does not polarize.
Fig. 7 is detection method process flow diagram of the present invention.
Fig. 8 is apparent resistivity and the apparent chargeability data plot in certain tunnel in the embodiment of the present invention.
In figure: 1. drill bit, 2. connection bearing, 3. high-strength insulation is with drill bushing cylinder, 4. elastic annular roller electrode, 5. elastic sheet, 6. ball, 7. solid electrolyte, 8. cable.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
For certain tunnel, tunnel cross-section is arch, span 12m height 10m, and constructing tunnel proceeds near mileage YK15+533, and front may exist water content.In order to verify front geological condition, for construction provides foundation and guidance, adopt the real-time detecting water by pilot hole forecasting procedure of orientation with drilling to detect, method flow diagram as shown in Figure 7.
(1) on the drill bit 1 carrying out advanced levels probing, install connection bearing 2, connection bearing 2 rear end connects high-strength insulation with drill bushing cylinder 3 with the form of draw-in groove, as shown in Figure 3.
(2) lay elastic annular roller electrode 4 at high-strength insulation with drill bushing cylinder 3 periphery, wherein have electrodes of A, be positioned at the centre position of high-strength insulation with drill bushing cylinder 3, auxiliary power supply electrode A
1, auxiliary power supply electrode A
2, be located at the two ends place of high-strength insulation with drill bushing cylinder 3 respectively, and with electrodes of A apart from equal, the observation electrode M do not polarized, the observation electrode N that do not polarize are in electrodes of A, auxiliary power supply electrode A
1between equidistantly lay.Plain metal electrode B is laid in infinite point in tunnel.All electrodes all pass through cable 8 and are connected with on-the-spot main frame; As depicted in figs. 1 and 2.
(3) carry out advanced levels probing, drill the certain depth that often advances, namely implement directed induced polarization forward probe.When not stopping creeping into, to electrodes of A, auxiliary power supply electrode A
1, auxiliary power supply electrode A
2feed the same sex electric current of equal size, form loop with plain metal electrode B, simultaneously at observation electrode M, observation electrode N place collection signal.
(4) on-the-spot main frame carries out real-time detection decipher to observation electrode M, observation electrode N collection signal, and obtain visual apparent resistivity and apparent chargeability result of detection: apparent resistivity is low, during apparent chargeability height, the Rock And Soil property of water-bearing of detection is strong; Apparent resistivity is high, and apparent chargeability is low, and the Rock And Soil property of water-bearing of detection is weak.In conjunction with results of drilling, forecast is made to front, tunnel front water content situation.Fig. 8 is apparent resistivity and the apparent chargeability data plot in certain tunnel in the present embodiment, and wherein the property of water-bearing at 545m-548m place is strong.
Described elastic annular roller electrode 4, be made up of elastic sheet 5 and ball 6, the diameter of elastic annular roller electrode 4 is greater than bore diameter, and elastic sheet 4 arranges groove, lays ball 6, as Figure 4-Figure 6.
In observation electrode M and observation electrode N, elastic sheet 5 outside surface, groove and ball 6 surface all scribble solid electrolyte 7, and cable tail is located in solid electrolyte 7.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (9)
1. the real-time detecting water by pilot hole device of constructing tunnel orientation with drilling induced polarization, it is characterized in that, comprise drill bit, high-strength insulation with drill bushing cylinder and directed induced polarization exploration system, described drill bit connects high-strength insulation with drill bushing cylinder by connection bearing, lays directed induced polarization exploration system at high-strength insulation with drill bushing cylinder periphery; Described directed induced polarization exploration system comprises directed transmitting electrode system and observation electrode system, and directed transmitting electrode system comprises transmitting electrode, two auxiliary power supply electrodes and plain metal electrode, and observation electrode system comprises two observation electrodes do not polarized; Described two auxiliary power supply electrodes are separately fixed at transmitting electrode both sides, and plain metal electrode is positioned at tunnel; Described observation electrode system is between transmitting electrode and an auxiliary power supply electrode, and directed induced polarization exploration system is connected with on-the-spot main frame by cable; In described directed induced polarization exploration system, except plain metal electrode, be the elastic annular roller electrode be laid on high-strength insulation sleeve; Described elastic annular roller electrode, comprises elastic sheet and ball, and the diameter of elastic annular roller electrode is greater than bore diameter; Elastic sheet arranges groove, lays ball.
2. the real-time detecting water by pilot hole device of constructing tunnel orientation with drilling induced polarization as claimed in claim 1, it is characterized in that, described two auxiliary power supply electrodes are equal with the distance of transmitting electrode.
3. the real-time detecting water by pilot hole device of constructing tunnel orientation with drilling induced polarization as claimed in claim 1, it is characterized in that, described observation electrode is equidistantly laid between transmitting electrode and an auxiliary power supply electrode.
4. the real-time detecting water by pilot hole device of constructing tunnel orientation with drilling induced polarization as claimed in claim 1, is characterized in that, described connection bearing rear end connects high-strength insulation with drill bushing cylinder with the form of draw-in groove.
5. the real-time detecting water by pilot hole device of constructing tunnel orientation with drilling induced polarization as claimed in claim 1, it is characterized in that, described high-strength insulation is with drill bushing cylinder, and adopt high-strength PVC insulating material, diameter is less than bore diameter.
6. the real-time detecting water by pilot hole device of constructing tunnel orientation with drilling induced polarization as claimed in claim 1, it is characterized in that, described observation electrode, elastic sheet outside surface, groove and ball surface all scribble solid electrolyte, are provided with cable tail in solid electrolyte.
7., based on the method for the real-time detecting water by pilot hole device according to any one of claim 1-6, it is characterized in that, comprise the steps:
(1) on the drill bit carrying out advanced levels probing, install connection bearing, connection bearing rear end connects high-strength insulation with drill bushing cylinder;
(2) lay directed transmitting electrode system and observation electrode system at high-strength insulation with drill bushing cylinder periphery, in described directed transmitting electrode system, two auxiliary power supply electrodes are separately fixed at transmitting electrode both sides, and plain metal electrode is positioned at tunnel; Described observation electrode system is between transmitting electrode and an auxiliary power supply electrode, and all electrodes of directed induced polarization exploration system are all connected with on-the-spot main frame by cable;
(3) carry out advanced levels probing, drill the certain depth that often advances, namely implement directed induced polarization forward probe;
When not stopping creeping into, feeding the same sex electric current of equal size to transmitting electrode, auxiliary power supply electrode, forming loop with plain metal electrode, simultaneously at observation electrode place collection signal;
(4) on-the-spot main frame carries out real-time detection decipher to observation electrode collection signal, obtains visual apparent resistivity and apparent chargeability result of detection; In conjunction with results of drilling, forecast is made to front, tunnel front water content situation.
8. the method for detecting water by pilot hole device in real time as claimed in claim 7, it is characterized in that, described two auxiliary power supply electrodes are equal with the distance of transmitting electrode.
9. the method for detecting water by pilot hole device in real time as claimed in claim 7, it is characterized in that, described observation electrode is equidistantly laid between transmitting electrode and an auxiliary power supply electrode.
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