CN111927553A - Bidirectional claw anchoring device of multipoint displacement meter and radial displacement measurement method of TBM tunnel surrounding rock - Google Patents
Bidirectional claw anchoring device of multipoint displacement meter and radial displacement measurement method of TBM tunnel surrounding rock Download PDFInfo
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- CN111927553A CN111927553A CN202010785056.8A CN202010785056A CN111927553A CN 111927553 A CN111927553 A CN 111927553A CN 202010785056 A CN202010785056 A CN 202010785056A CN 111927553 A CN111927553 A CN 111927553A
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- 210000000078 claw Anatomy 0.000 title claims abstract description 89
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 89
- 238000004873 anchoring Methods 0.000 title claims abstract description 73
- 239000011435 rock Substances 0.000 title claims abstract description 60
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 13
- 238000000691 measurement method Methods 0.000 title description 7
- 230000000903 blocking effect Effects 0.000 claims abstract description 59
- 238000005553 drilling Methods 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000009434 installation Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000011440 grout Substances 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 230000035945 sensitivity Effects 0.000 claims description 4
- 239000013013 elastic material Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 description 9
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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Abstract
The invention discloses a bidirectional blocking claw anchoring device of a multipoint displacement meter, which comprises a guide pipe arranged in a drill hole, wherein a plurality of blocking claw openings and slurry seepage ports are formed in the guide pipe; the inner end and the outer end of the rod body are respectively connected with an anchoring end head and a sensor; two groups of supporting claws are oppositely arranged on the outer circumference of the anchoring end. The invention also discloses a method for measuring the radial displacement of the TBM tunnel surrounding rock. The bidirectional fixing device realizes bidirectional fixing of the anchoring end, and on one hand, the bidirectional retaining claw is used for fixing the anchoring end on the rock surface of the drilled hole when the drilling slurry is not full, so that the situation that the anchoring end is suspended and the displacement value of the surrounding rock cannot be read is avoided. On the other hand, the blocking claw can be bidirectionally fixed on the rock surface of the drilled hole, so that the measurement error caused by incomplete cooperative deformation of surrounding rock and slurry is reduced.
Description
Technical Field
The invention relates to the technical field of TBM tunnel engineering surrounding rock deep displacement testing, in particular to a bidirectional claw anchoring device of a multipoint displacement meter and a radial displacement measuring method of TBM tunnel surrounding rock.
Background
The TBM construction method has the advantages of high construction speed, small disturbance of surrounding rock excavation at one time and the like, so that the TBM construction method is more and more widely applied to long-distance tunnel engineering. In construction, due to the influence of TBM excavation, surrounding rocks displace to generate stress state change, and the change and reconstruction of the stress state of the surrounding rocks can cause the displacement of the internal surrounding rocks to generate a tunnel surrounding rock loosening ring, so that a tunnel plastic zone is finally formed. The change of the surrounding rock displacement affects the safety of the tunnel structure, so that the change condition of the displacement inside the tunnel surrounding rock needs to be mastered in the TBM tunnel construction, and the safety of the tunnel construction is ensured.
At present, the application of the drilling type multipoint displacement meter in the displacement monitoring inside a tunnel is wide, the multipoint displacement meter mainly comprises a displacement meter group, a displacement transmission rod, a protection pipe, a sensor, an anchoring end head and the like, and when the drilling type multipoint displacement meter is used, the anchoring end head is directly combined with surrounding rock through slurry solidification or anchored with the surrounding rock through a one-way inverted claw structure. However, the drilling and grouting can not ensure that the grout is completely full, the end of the multipoint displacement meter can be suspended, so that the measuring result cannot be accurate, meanwhile, the elastic modulus of the surrounding rock and the solidified grout are not completely the same, and the deformation of the surrounding rock and the solidified grout cannot be completely consistent, so that an error exists in the measurement process; the inverted claw anchor rod structure adopts the unidirectional inverted claw, the unidirectional inverted claw cannot play an anchoring role when the internal displacement of the bottom tunnel is tested, the actual position of a measuring point is different from the designed position, and the displacement analysis of the tunnel surrounding rock is influenced.
In the TBM tunneling construction, a drilling machine for drilling by the multipoint displacement meter can only walk along the fixed annular beam, a drilling rod cannot be perpendicular to a rock surface for construction, and the axis of a drilling hole and the rock surface of the tunnel profile form a certain included angle, so that the surrounding rock displacement measured by the multipoint displacement meter in the drilling hole cannot point to the center of the TBM tunnel, the tunnel convergence and surrounding rock loosening circle cannot be correctly reflected, and the obtained tunnel surrounding rock displacement value has a large error.
Disclosure of Invention
In view of the above, the present invention provides a bidirectional pawl anchoring device for a multipoint displacement meter, and a radial displacement measurement method for a tunnel surrounding rock of a TBM based on the bidirectional pawl anchoring device, so that the installation accuracy of a multipoint displacement device is ensured, the internal displacement of the surrounding rock pointing to the center of the tunnel can be obtained, and the acquisition of the loose circle of the tunnel surrounding rock is really realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
a two-way catch claw anchoring device of a multipoint displacement meter is characterized in that a drill hole is formed in a TBM tunnel surrounding rock measuring point, the device comprises a guide pipe arranged in the drill hole, a plurality of catch claw openings and slurry seepage ports are formed in the pipe wall of the guide pipe, a fixing plate is arranged in the guide pipe, and a rod body hole and a slurry injection pipe hole for installing a rod body and a slurry injection pipe are respectively formed in the fixing plate; a dowel bar or a steel wire of the multipoint displacement meter is arranged in the rod body, and the inner end and the outer end of the dowel bar or the steel wire are respectively connected with an anchoring end head of the multipoint displacement meter and a sensor; two groups of supporting claws are oppositely arranged on the outer circumference of the anchoring end, each group of supporting claws consists of three blocking claws, and the included angle between every two adjacent blocking claws is 60 degrees; each blocking claw is respectively contacted with the inner wall of the drill hole through a blocking claw opening correspondingly arranged to the blocking claw.
According to the technical scheme, the opening of the blocking claw is used for enabling the blocking claw to penetrate out of the guide pipe, fixing the anchoring end head at a set place in the drill hole, and limiting the blocking claw to prevent the blocking claw from moving, so that the movement of the anchoring end head is effectively avoided, the stability of the anchoring end head is improved, and the measuring accuracy is improved; two groups of supporting claws are oppositely arranged on the anchoring end head to further fix the anchoring end head, so that the blocking claws are prevented from deviating due to unstable stress; the three blocking claws enable the anchoring end to be stressed more uniformly and have stronger stability; the rod body is used for protecting accessories arranged in the rod body and increasing the reading accuracy of the multipoint displacement meter; the slurry seepage port is a rectangular opening and is mainly used for slurry seepage during drilling and grouting so as to ensure that the drilling and grouting are full.
Preferably, the fixed plate is provided with three rod body holes and a grouting pipe hole respectively, and the included angle between the circle centers of two adjacent rod body holes and the circle center of the fixed plate is 120 degrees; the included angle gamma between the circle centers of two adjacent grouting pipe holes and the circle center of the fixing plate is 120 degrees.
Preferably, the anchor tips are spaced apart in an axial direction within the guide tube.
The anchoring ends connected to the inner end of the rod body are not interfered with each other, so that the tracks of the blocking claws on each anchoring end are not overlapped, and the blocking claw openings corresponding to each blocking claw are respectively positioned on different axes, thereby facilitating the installation of the blocking claws.
Preferably, the peripheral wall of the fixed plate is provided with a plurality of positioning bolts, and the axial inner wall of the guide tube is respectively provided with a sliding groove corresponding to the positioning bolt and the blocking claw. The installation of convenient fixed plate reduces installation time, improves work efficiency.
Preferably, an exhaust pipe is further arranged in the grouting pipe hole. The exhaust pipe is used for discharging internal gas outwards, so that bubbles in slurry in the drill hole are reduced, and the compactness of the slurry is improved.
Preferably, the guide pipe is a hollow round pipe, and the inner end of the guide pipe is conical. The installation of the guide pipe is convenient.
Preferably, the number of the fixing plates is two, and the fixing plates are respectively arranged on two sides of the anchoring end head closest to the rock surface of the tunnel in parallel.
Preferably, the latch is made of an elastic material. The blocking claw has certain elasticity and strength, can ensure the blocking claw to be always in contact with the inner wall of the drilled hole, and can not be suspended because the inner wall of the drilled hole is uneven.
A radial displacement measurement method for TBM tunnel surrounding rock adopts a bidirectional blocking claw anchoring device, and comprises the following steps:
(1) measuring included angle between drilling hole axis and tunnel rock surface by angle gauge
Dividing a tunnel drilling hole into three measuring points, namely a first measuring point, a second measuring point and a third measuring point from inside to outside in sequence;
(2) a dowel bar or a steel wire of the multipoint displacement meter penetrates through the rod body, so that the rod body is contacted with the anchoring end;
(3) pressing the blocking claw to enable the blocking claw to be tightly attached to the anchoring end, enabling the blocking claw to be correspondingly installed with the sliding groove, pushing the corresponding anchoring end into the guide pipe by the pushing rod body, and pushing the pushing rod body to be arranged at the position of the front end of the opening of the blocking claw corresponding to the first measuring point;
(4) repeating the step (3) and placing the other anchoring end head at the front end position of the opening of the blocking claw corresponding to the second measuring point;
(5) the grouting pipe penetrates through a grouting pipe hole in a fixed plate, and the first two rod bodies penetrate through corresponding rod body holes in the fixed plate;
(6) pushing the fixed plate into the guide tube along the sliding groove corresponding to the positioning bolt above the fixed plate, and placing the fixed plate between the second measuring point and the third measuring point;
(7) repeating the step (3) to place the third anchoring end head at the front end position of the opening of the blocking claw corresponding to the third measuring point;
(8) the exhaust pipe and the grouting pipe penetrate through a grouting pipe hole in the other fixing plate, and the three rod bodies penetrate through rod body holes in the fixing plate respectively;
(9) repeating the step (6) to place the fixing plate between the third measuring point and the drilling port to finish the pre-installation of the anchoring device;
(10) integrally putting the pre-installed anchoring device in the step (9) into a drilled hole, integrally pushing the three rod bodies to enable the blocking claw to automatically bounce and be fixed at the opening of the blocking claw, and fixing the anchoring end on the rock surface of the drilled hole;
(11) grouting by adopting a retreating type grouting process to ensure that the grout in the drill hole is full, pulling out a grouting pipe and an exhaust pipe after grouting is finished, and fixing the end head of a sensor of the multipoint displacement meter close to the rock surface of the tunnel;
(12) reading the readings of the multipoint displacement meter, and acquiring displacement variables of the measuring points, wherein the calculation formula is as follows:
△hi＝K(fj 2-f0 2)
wherein: Δ hi-i measuring point axial displacement variable (mm) of the borehole at time j;
k-sensor sensitivity coefficient (mm/Hz 2);
f0-initial frequency value (Hz) of the sensor;
fj-the value of the operating frequency (Hz) at the moment of sensor j;
(13) and calculating the radial displacement variable of the measuring point by using the axial displacement of the measuring point drill hole, wherein the calculation formula is as follows:
ΔSr＝Δhicosβ
wherein: delta Sr-measuring point radial displacement variables;
beta is an included angle between a connecting line of the measuring point and the center of the tunnel circle and the axis of the drill hole;
alpha is an included angle between a connecting line of the measuring point and the center of the tunnel and a connecting line of the drilling port and the center of the tunnel;
The invention has the beneficial effects that:
the two-way fixing of the anchoring end is realized by oppositely arranging the two groups of supporting claws, on one hand, the two-way retaining claws are fixed on the rock surface of the drilled hole when the slurry of the drilled hole is not full, and the situation that the displacement value of the surrounding rock cannot be read because the anchoring end is suspended is avoided. On the other hand, the blocking claw can be bidirectionally fixed on the rock surface of the drilled hole, so that the measurement error caused by incomplete cooperative deformation of surrounding rock and slurry is reduced. And moreover, the radial displacement measurement method can really realize the measurement of the displacement variable value of the surrounding rock pointing to the center of the tunnel in the TBM tunnel and correctly reflect the loosening circle of the surrounding rock. The test device is simple to install on site and easy to operate, the installation power of the multipoint displacement meter on the construction site can be effectively improved, and the calculation result of the measurement method can truly reflect the radial displacement variable of the surrounding rock of the TBM tunnel.
Drawings
FIG. 1 is a schematic diagram of a TBM tunnel boring position;
FIG. 2 is a schematic view of the axial arrangement of the bi-directional latch anchoring multi-point displacement gauge in the borehole;
FIG. 3 is a schematic view of the planar arrangement of the bi-directional latch anchoring multipoint displacement meter in the bore hole;
3 FIG. 3 4 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 A 3- 3 A 3; 3
FIG. 5 is a sectional view taken along the direction B-B;
FIG. 6 is a layout view of the pawl;
FIG. 7 is a view of a pawl opening arrangement;
FIG. 8 is a schematic view of the fixing plate;
FIG. 9 is an expanded view of the guide tube;
FIG. 10 is a schematic view of radial displacement calculation.
In the figure: the tunnel wall rock grouting device comprises a guide pipe 1, a drill hole 2, a tunnel wall rock 3, an anchoring end 4, a retaining claw 5, a rod body 6, a grouting hole 7, a sensor 8, a tunnel contour surface 9, a sliding groove 10, a retaining claw opening 11, a rod body hole 12, a fixing plate 13, a grouting pipe 14, an exhaust pipe 15, a grouting pipe hole 16 and a positioning bolt 17.
Detailed Description
The invention is further described below with reference to the figures and examples.
Examples
As shown in fig. 1-9, a two-way claw anchoring device of a multipoint displacement meter is characterized in that a hole is formed in a measuring point of tunnel surrounding rock of a TBM (tunnel boring machine), the anchoring device comprises a guide pipe 1 installed in a hole 2 of the tunnel surrounding rock 3, the guide pipe 1 is a hollow circular pipe, and the inner end of the guide pipe is conical. The pipe wall of the guide pipe 1 is provided with a plurality of rectangular blocking claw openings 11 and a plurality of slurry seepage openings 7, a circular fixing plate 13 is arranged inside the guide pipe 1, three rod body holes 12 and slurry injection pipe holes 16 are arranged on the fixing plate 13, and as shown in fig. 8, the included angle between the circle centers of two adjacent rod body holes 12 and the circle center of the fixing plate 13 is 120 degrees; the included angle gamma between the circle centers of two adjacent grouting pipe holes 16 and the circle center of the fixing plate 13 is 120 degrees. The rod body 6 and the grouting pipe 14 are respectively installed by penetrating through the corresponding rod body hole 12 and the corresponding grouting pipe hole 16 on the fixing plate 13; the rod body is a hollow round tube, a dowel bar or a steel wire of the multipoint displacement meter is arranged in the rod body 6, the inner end and the outer end of the rod body 6 are respectively connected with an anchoring end 4 and a sensor 8 of the multipoint displacement meter, the sensor 8 is arranged close to the contour surface 9 of the tunnel, and the anchoring end 4 is in a cylindrical shape with a groove or a step-shaped cylindrical shape; a grout pipe 14 and an exhaust pipe 15 are provided in the grout pipe hole 16.
The three anchor points 4 are arranged at intervals in the axial direction in the guide tube 1 so that the anchor points 4 do not interfere with each other, and the positions of the three anchor points 4 are shown in fig. 3 when viewed from the end face of the borehole 2. And two groups of supporting claws are oppositely arranged on the outer circumference of the anchoring end head 4, the two groups of supporting claws are respectively arranged at the upper end and the lower end of the anchoring end head 4, each group of supporting claws consists of three blocking claws 5, one blocking claw 5 is vertical to the anchoring end head 4, and the other two blocking claws 5 are distributed at the two sides of the blocking claw. The catch 5 is made of elastic material, a pressure spring is adopted, a gasket can be arranged at the front end of the pressure spring, and the pressure spring can move in the sliding groove conveniently. The lengths of the retaining claws 5 at different positions are different, the included angle between adjacent retaining claws 5 is 60 degrees, the specific arrangement mode is shown in fig. 6, and the distribution of the retaining claws 5 is matched with the direction of the retaining claw opening 11, as shown in fig. 4; the free end of each catch 5 is in fixed contact with the inner wall of the borehole 2 via a catch opening 11 arranged in correspondence therewith.
Two fixing plates 13 are arranged in the guide pipe 1 and are respectively arranged on two sides of the anchoring end head 4 closest to the rock surface of the tunnel in parallel.
A plurality of positioning bolts 17 are arranged on the outer peripheral wall of the fixed plate 13, and sliding grooves 10 corresponding to the positioning bolts 17 and the catch 5 are respectively arranged on the axial inner wall of the guide tube 1.
Example 2
A radial displacement measurement method for TBM tunnel surrounding rock adopts a bidirectional claw anchoring device of a multipoint displacement meter, and comprises the following steps:
(1) angle measuring instrument for measuring included angle between axis of drilled hole 2 and rock surface of tunnel
Dividing the tunnel borehole 2 into three measuring points, namely a first measuring point, a second measuring point and a third measuring point from inside to outside in sequence;
(2) a dowel bar or a steel wire of the multipoint displacement meter penetrates through the rod body, so that the rod body is contacted with the anchoring end 4;
(3) pressing the blocking claw 5 to be tightly attached to the anchoring end 4, enabling the blocking claw 5 to be correspondingly installed with the sliding groove 10, pushing the corresponding anchoring end 4 into the guide pipe 1 by the pushing rod body, and pushing the pushing rod body to be arranged at the front end position of the blocking claw opening 11 corresponding to the first measuring point;
(4) repeating the step (3) and placing the other anchoring end 4 at the front end position of the blocking claw opening 11 corresponding to the second measuring point;
(5) the grouting pipe 14 passes through a grouting pipe 14 hole on a fixed plate 13, and the first two rod bodies 6 pass through corresponding rod body holes 12 on the fixed plate 13;
(6) pushing the fixed plate 13 into the guide tube 1 along the sliding groove 10 corresponding to the positioning bolt 17 above the fixed plate, and placing the fixed plate between the second measuring point and the third measuring point;
(7) repeating the step (3) to place the third anchoring end 4 at the front end position of the claw blocking opening 11 corresponding to the third measuring point;
(8) the exhaust pipe 15 and the grouting pipe 14 penetrate through a grouting pipe hole 16 on the other fixing plate 13, and simultaneously, the three rod bodies 6 respectively penetrate through the rod body holes 12 on the fixing plate 13;
(9) repeating the step (6) to place the fixing plate 13 between the third measuring point and the port of the drill hole 2, and finishing the pre-installation of the anchoring device;
(10) integrally putting the pre-installed anchoring device in the step (9) into the drill hole 2, integrally pushing the three rod bodies to enable the blocking claw 5 to be automatically flicked and fixed at the blocking claw opening 11 for fixing the anchoring end 4 on the rock surface of the drill hole 2;
(11) grouting by adopting a retreating type grouting process to ensure that the grout in the drill hole 2 is full, pulling out the grouting pipe 14 and the exhaust pipe 15 after grouting is finished, and fixing the end of the sensor 8 of the multipoint displacement meter close to the tunnel contour surface 9;
(12) reading the readings of the multipoint displacement meter, and acquiring displacement variables of the measuring points, wherein the calculation formula is as follows:
△hi＝K(fj 2-f0 2)
wherein: Δ hi-i measuring point axial displacement variable (mm) of the borehole at time j;
k-sensor sensitivity coefficient (mm/Hz 2);
f0-initial frequency value (Hz) of the sensor;
fj-the value of the operating frequency (Hz) at the moment of sensor j;
(13) measuring point radial displacement variable Delta S is calculated by using axial displacement of measuring point drill holerMeter for measuring
The calculation formula is as follows:
ΔSr＝Δhicosβ
wherein: beta is an included angle between a connecting line of the measuring point and the center of the tunnel circle and the axis of the drill hole;
alpha is an included angle between a connecting line of the measuring point and the center of the tunnel and a connecting line of the drilling port and the center of the tunnel;
As shown in fig. 10, O is the center of the tunnel, a is the intersection point of the drill hole and the tunnel (i.e., the starting point of the drill hole), AB is the axial direction of the drill hole, the measuring points are distributed in the AB direction, and the deformation of the surrounding rock around the tunnel is grasped by measuring the displacement variables from the positions of the different measuring points to the center of the tunnel, so as to accurately reflect the specific situations of tunnel convergence and surrounding rock loosening.
For example: and taking B as a first measuring point, and calculating the value of the radial displacement variable at the first measuring point B according to the steps.
An angle instrument is adopted to measure and measure the included angle between the drilling hole axis (along the AB direction) and the tunnel rock surface (along the AC direction)
Reading the initial moment multipoint displacement meter reading f of the B measuring point01609.93 Hz; reading j moment multipoint displacement meter reading fj1733.27Hz, and the sensitivity coefficient K of the displacement sensor is 1.198 multiplied by 10-5mm/Hz2。
Substituting the data into the formula Δ hi＝K(fj 2-f0 2) Obtaining the displacement variable delta h of the B measuring point at the moment j along the axial line of the drill hole (along the AB direction)i＝4.94mm。
Through the multi-point displacement measurement point arrangement design scheme, the included angle alpha between the connecting line of the point A and the center of the tunnel and the connecting line of the point B of the drill hole and the center of the tunnel is 20.16 degrees, so that the included angle beta between the connecting line of the point A and the center of the tunnel and the axis of the drill hole is 53.54 degrees.
By the formula:
ΔSr＝Δhicosβ
calculating to obtain the variation quantity delta S of the B measuring point in the OB direction (the direction from the measuring point to the center of the tunnel circle)r＝4.74mm。
Thus obtaining the radial displacement change value of the measuring point.
According to the radial displacement variable obtained by the method, the deformation of surrounding rocks around the tunnel can be better mastered, so that the specific conditions of tunnel convergence and surrounding rock loosening circle can be correctly reflected.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. A bidirectional blocking claw anchoring device of a multipoint displacement meter is characterized by comprising a guide pipe arranged in a drill hole, wherein the pipe wall of the guide pipe is provided with a plurality of blocking claw openings and slurry seepage ports; a dowel bar or a steel wire of the multipoint displacement meter is arranged in the rod body, and the inner end and the outer end of the dowel bar or the steel wire are respectively connected with an anchoring end head of the multipoint displacement meter and a sensor; two groups of supporting claws are oppositely arranged on the outer circumference of the anchoring end, each group of supporting claws consists of three blocking claws, and the included angle between every two adjacent blocking claws is 60 degrees; each blocking claw is respectively contacted with the inner wall of the drill hole through a blocking claw opening correspondingly arranged to the blocking claw.
2. The two-way latch claw anchoring device of the multipoint displacement meter according to claim 1, wherein the fixing plate is provided with three rod body holes and a grouting pipe hole respectively, and an included angle between the circle centers of two adjacent rod body holes and the circle center of the fixing plate is 120 degrees; the included angle gamma between the circle centers of two adjacent grouting pipe holes and the circle center of the fixing plate is 120 degrees.
3. The bi-directional pawl anchor of claim 2, wherein said anchor tips are spaced axially within said guide tube.
4. The bi-directional latch anchoring device of a multipoint displacement meter according to claim 1, wherein a plurality of positioning pins are provided on the outer peripheral wall of the fixing plate, and sliding grooves corresponding to the positioning pins and the latches are provided on the inner axial wall of the guide tube, respectively.
5. The bi-directional latch anchor of the multipoint displacement meter according to claim 1, wherein an exhaust tube is further disposed in said grouting bore.
6. The bi-directional latch anchor of claim 1, wherein the guide tube is a hollow circular tube and has a conical inner end.
7. The bi-directional latch anchoring device of the multipoint displacement meter according to claim 1, wherein the number of the fixing plates is two, and the two fixing plates are respectively arranged on two sides of the anchoring head closest to the rock surface of the tunnel in parallel.
8. The bi-directional pawl anchor of claim 1, wherein said pawl is made of an elastic material.
9. A method for measuring the radial displacement of TBM tunnel surrounding rock is characterized in that a bidirectional blocking claw anchoring device adopting the multipoint displacement meter in claims 1-8 comprises the following steps:
(1) measuring included angle between drilling hole axis and tunnel rock surface by angle gauge
Dividing a tunnel drilling hole into three measuring points, namely a first measuring point, a second measuring point and a third measuring point from inside to outside in sequence;
(2) a dowel bar or a steel wire of the multipoint displacement meter penetrates through the rod body, so that the rod body is contacted with the anchoring end;
(3) pressing the blocking claw to enable the blocking claw to be tightly attached to the anchoring end, enabling the blocking claw to be correspondingly installed with the sliding groove, pushing the corresponding anchoring end into the guide pipe by the pushing rod body, and pushing the pushing rod body to be arranged at the position of the front end of the opening of the blocking claw corresponding to the first measuring point;
(4) repeating the step (3) and placing the other anchoring end head at the front end position of the opening of the blocking claw corresponding to the second measuring point;
(5) the grouting pipe penetrates through a grouting pipe hole in a fixed plate, and the first two rod bodies penetrate through corresponding rod body holes in the fixed plate;
(6) pushing the fixed plate into the guide tube along the sliding groove corresponding to the positioning bolt above the fixed plate, and placing the fixed plate between the second measuring point and the third measuring point;
(7) repeating the step (3) to place the third anchoring end head at the front end position of the opening of the blocking claw corresponding to the third measuring point;
(8) the exhaust pipe and the grouting pipe penetrate through a grouting pipe hole in the other fixing plate, and the three rod bodies penetrate through rod body holes in the fixing plate respectively;
(9) repeating the step (6) to place the fixing plate between the third measuring point and the drilling port to finish the pre-installation of the anchoring device;
(10) integrally putting the pre-installed anchoring device in the step (9) into a drilled hole, integrally pushing the three rod bodies to enable the blocking claw to automatically bounce and be fixed at the opening of the blocking claw, and fixing the anchoring end on the rock surface of the drilled hole;
(11) grouting by adopting a retreating type grouting process to ensure that the grout in the drill hole is full, pulling out a grouting pipe and an exhaust pipe after grouting is finished, and fixing the end head of a sensor of the multipoint displacement meter close to the rock surface of the tunnel;
(12) reading the readings of the multipoint displacement meter, and acquiring displacement variables of the measuring points, wherein the calculation formula is as follows:
△hi＝K(fj 2-f0 2)
wherein: Δ hiThe axial displacement variable mm of the measuring point at the moment j in the drilling hole is measured;
k-sensor sensitivity coefficient (mm/Hz)2)；
f0-initial frequency value (Hz) of the sensor;
fj-the value of the operating frequency (Hz) at the moment of sensor j;
(13) and calculating the radial displacement variable of the measuring point by using the axial displacement variable of the measuring point drill hole, wherein the calculation formula is as follows:
△Sr＝△hi cosβ
wherein: delta Sr-measuring point radial displacement variables;
beta is an included angle between a connecting line of the measuring point and the center of the tunnel circle and the axis of the drill hole;
alpha is an included angle between a connecting line of the measuring point and the center of the tunnel and a connecting line of the drilling port and the center of the tunnel;
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