CN110792450A - Method for determining advanced support of grouting anchor cable - Google Patents
Method for determining advanced support of grouting anchor cable Download PDFInfo
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- CN110792450A CN110792450A CN201910919285.1A CN201910919285A CN110792450A CN 110792450 A CN110792450 A CN 110792450A CN 201910919285 A CN201910919285 A CN 201910919285A CN 110792450 A CN110792450 A CN 110792450A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005065 mining Methods 0.000 claims abstract description 30
- 238000011156 evaluation Methods 0.000 claims abstract description 7
- 239000011435 rock Substances 0.000 claims description 32
- 238000006073 displacement reaction Methods 0.000 claims description 22
- 238000000926 separation method Methods 0.000 claims description 20
- 238000005553 drilling Methods 0.000 claims description 19
- 238000012544 monitoring process Methods 0.000 claims description 17
- 238000010276 construction Methods 0.000 claims description 12
- 238000004088 simulation Methods 0.000 claims description 9
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- 238000004873 anchoring Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 230000032798 delamination Effects 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract 1
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- 239000003245 coal Substances 0.000 description 6
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/006—Lining anchored in the rock
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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
- 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
- E21F17/185—Rock-pressure control devices with or without alarm devices; Alarm devices in case of roof subsidence
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Abstract
The invention discloses a method for determining a grouting anchor cable advance support, which comprises the following steps: z1 prediction of L based on lane convergence1And the roadway safety convergence L2Establishing operation safety evaluation; z2 obtaining predicted lane convergence L3Comparison L2And L3The magnitude of the value; when L is3A value of L or more2When the value of (A) is less than the preset value, the maximum safe support parameter needs to be selected again until L3Is less than L2A value of (d); when L is3Is less than L2When the value of (c) is zero, continue to step Z3; z3 obtaining the actual convergence L of the tunnel4Comparison L2And L4The magnitude of the value; when L is4A value of L or more2When the value of (A) is less than the predetermined value, the advance support parameters need to be re-determined until L4Is less than L2A value of (d); when L is4Is less than L2When the value is equal to (2), the injection adopted by the mining roadway is indicatedThe slurry anchor cable is safe and reliable for advanced support. The method for determining the advanced support parameters of the grouting anchor cable has high safety, is convenient and quick and has excellent engineering applicability.
Description
Technical Field
The invention relates to the field of coal mine exploitation, in particular to a method for determining a grouting anchor cable advance support.
Background
The area influenced by forward mining at the intersection of the mining direction of the coal face and the mining roadway is the throat position of pedestrians, ventilation and equipment transportation, the space of the front section of the working face is small, the equipment is more, the number of operating personnel is more, and the area is easy to have potential safety hazards due to the special space environment of a necessary path for workers to pass in and out the working face. Meanwhile, the area is influenced by mining and various supporting pressures, mine pressure is complex to show, a roadway is difficult to maintain, and safe and effective support of the front-exceeding section of a working face is always the key and difficult point of mine surrounding rock control. Particularly, after mining enters a deep part, along with the remarkable increase and complexity of self-weight stress and structural stress of a rock body, the mine pressure of a leading section is more violent, so that the phenomena of top plate sinking, roadway side contraction, bottom bulging, even impact and other strong mine pressure are often caused, and the section of a roadway is reduced sharply. The common advance support mode in China mainly comprises the following steps: single prop pi-shaped beam support and advance hydraulic support.
And supporting the single prop by a pi-shaped beam. The combination of the Pi-shaped beam and the single hydraulic prop is used as a basic support to replace a support mode that a hinged top beam is matched with the single prop, and the support mode is also a support mode taking passive support as a main support. The support has strong integrity, and has obvious better support effect than a hinged top beam on a broken top plate caused by the influence of a geological structure. Compared with the hinged top beam, the pi-shaped beam reduces the labor intensity of workers, improves the production efficiency and reduces the difficulty of safety management. But compared with the advance hydraulic support, the support of the single prop pi-shaped beam is troublesome in operation and high in labor intensity of workers. With the development of the fully mechanized mining technology, the single prop pi-shaped beam support cannot meet the support requirement after the mechanical large-scale production.
The advanced hydraulic support has high mechanization degree, high support intensity and low labor intensity of workers, and is a common support mode for large fully mechanized coal mining faces. The sufficient supporting force, the large-area supporting range and the reliable stability of the forepoling cannot be compared with those of a shed support consisting of single hydraulic supports and a pi-shaped beam, but due to the sufficient supporting force and the large-area supporting range, a material lane top plate is broken and separated after being repeatedly supported for many times, sometimes even a local roof fall phenomenon occurs, meanwhile, the reduction of the effective broken area of the roadway is large due to the fact that the forepoling has large volume, and factors such as sinking and roadway deformation are very easy to cause large reduction of the effective broken area of the roadway when the top plate is broken, so that potential safety hazards such as wind speed overrun and the like are caused, meanwhile, the large supporting coverage area of the forepoling causes the excessive deformation of part of the top anchor cable leakage part in the supporting process, the anchor cable tray cannot be recycled, so that the suspended area of an old roadway empty area is too large.
Nineteenth seven provisions of coal mine safety regulations: the method is characterized in that supports must be reinforced within the influence range of the advance pressure of all safety exits and the junctions of the tunnel on the coal face, the length of the tunnel for reinforcing the supports is not less than 20m, and it is not explicitly indicated which form is adopted to reinforce the supports in the advance support section, so that the requirement on the support strength of the advance section of the mining tunnel can be met, and a proper advance support form can be selected in the existing support technology. Based on the method, the hollow grouting anchor rope is adopted to reinforce the supporting of the forepoling section of the stope face, compared with the traditional single hydraulic prop or forepoling support form, the grouting anchor rope can greatly reduce the labor intensity, improve the mechanization degree, improve the construction efficiency and reduce the supporting cost, and the forepoling section supporting form is changed, so whether the reinforcing supporting strength of the grouting anchor rope of the forepoling section meets the safety production requirement needs to be proved.
Therefore, a method for determining advanced support parameters of grouting anchor cables based on drilling detection, surrounding rock deformation, anchor rod stress characteristics, loosening ring development rules and other mine pressure manifestation rules is needed to be developed, and the method has important significance for improving safety and efficient mining of a stope face.
Disclosure of Invention
The invention aims to provide a method for determining the advance support of a grouting anchor cable, which can ensure the safety of the advance support of the grouting anchor cable and is a convenient and quick method for determining the advance parameters of the grouting anchor cable with excellent engineering applicability.
The method is characterized in that a grouting anchor rope advancing method is adopted on the basis of an original permanent support (anchor net combined support) of a fully mechanized mining face mining roadway, an anchor rope is anchored into a stable surrounding rock of a top plate, the top plate of a coal seam is suspended on an upper firm rock stratum, and axial constraint force is applied to the top plate to form a stable structure for bearing; and filling gaps and hole bodies of the broken top plate by grouting, and cementing the top plate of the stoping roadway into a whole. The method for determining the advanced support parameters of the grouting anchor cable is based on the drilling detection and the mine pressure display rules such as the deformation of surrounding rock, the stress characteristics of the anchor rod, the development rule of the loosening ring and the like.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a method for determining a grouting anchor cable advance support, which comprises the following steps:
z1, predicting roadway convergence L according to field conditions1Determining the safety convergence L of the tunnel according to the advance support standard of the tunnel2Predicting L based on the convergence of the roadway1And the roadway safety convergence L2Establishing operation safety evaluation;
z2, calculating to obtain the advanced support parameters of the grouting anchor cable according to the supporting structure and principle of the grouting anchor cable, selecting the maximum safe support parameters, and obtaining the prediction L of the roadway convergence from the parameters3Comparison L2And L3The magnitude of the value; when L is3A value of L or more2When the value of (A) is less than L, the advance support parameters need to be adjusted, and the maximum safe support parameters are reselected until L3Is less than L2A value of (d); when L is3Is less than L2When the value of (c) is zero, continue to step Z3;
z3, constructing according to the maximum safe support parameter in the determined advance support parameters, and carrying out on-site monitoring to obtain the actual convergence L of the roadway4Comparison L2And L4The magnitude of the value; when L is4A value of L or more2When the value of (c) is greater than the value of (d), the lead in step Z2 needs to be adjustedSupport parameters, re-determining advance support parameters until L4Is less than L2A value of (d); when L is4Is less than L2When the value is greater than the preset value, the grouting anchor cable adopted by the mining roadway is indicated to be safe and reliable for advance support.
Further, the prediction of the amount of convergence of the lane L in step Z11The field conditions based include engineering geological profiles, production conditions and roadway support structures.
Still further, the lane safety convergence amount L in step Z12Determining roadway surrounding rock deformation and damage characteristics and stress distribution conditions under the mining influence of a working face and the superposition effect of lateral bearing pressure through an analogy method, numerical simulation and model test based on roadway advanced support specifications, determining a roadway advanced support pressure distribution rule, determining an advanced support distance, obtaining evolution characteristics of surrounding rock cracks, roof separation characteristics and roof rock stratum integrity, determining the roadway safety convergence L on the premise of ensuring construction safety2。
Still further, in step Z1, the roadway safety convergence L is determined2And (4) detecting in combination with the drilling.
Further, in step Z2, determining stress distribution characteristics and strength criteria of the grouting anchor cable support structure and principle, establishing a mechanical constitutive model for the construction roadway, performing theoretical calculation, numerical simulation and simulation experiments, determining stress bearing effect and stress distribution characteristics of the grouting anchor cable on the top plate, establishing stress evolution characteristics of the roadway and anchoring grouting structure characteristics of the support roadway under the action of mining disturbance of the working face and lateral support pressure, and primarily determining advanced support parameters of the grouting anchor cable based on the stress distribution characteristics.
Further, in step Z3, advance support is performed on the mining roadway within the advance support range by using a grouting anchor cable, advance support is performed on the mining roadway along the advancing direction of the working face along with the advancing of the working face, a certain advance support safety distance is always kept on the mining roadway, in addition, on-site monitoring is performed on the advance support roadway, and surrounding rock crack evolution performance of the roadway is monitoredThe method comprises the steps of changing a rule, showing a mine pressure rule, changing a change range of a surrounding rock loosening ring, analyzing plastic zone distribution characteristics, stress distribution characteristics and surrounding rock deformation characteristics, further analyzing the stability of a top plate of a forepoling section, and obtaining the actual convergence L of a roadway4。
Still further, the in-situ monitoring in step Z3 includes borehole probing, surface displacement monitoring, and roof delamination monitoring.
Further, the on-site monitoring in the step Z3 is realized by an online mine pressure observation system, roadway surface displacement detection, a roof separation instrument and a drilling detector; the online mine pressure observation system comprises a borehole stress meter, a top plate displacement sensor and an anchor cable stress meter; detecting the displacement of the roadway surface through an ore pressure manual observation point; the drilling stress meter, the mine pressure manual observation point, the roof separation instrument, the roof displacement sensor and the anchor cable stress meter are all provided with a plurality of in the extending direction of the roadway at intervals.
Further, the drilling stress meter is arranged on a roadway side; the mine pressure manual observation point is arranged on the roof or the roadway side; the roof separation layer instrument, the roof displacement sensor and the anchor cable stress gauge are arranged on the roof.
Further, the spacing distance between two adjacent borehole stressometers is 25 m; the spacing distance between two adjacent ore pressure manual observation points is 25 m; the spacing distance between two adjacent anchor cable stressometers is 25 m; the spacing distance between two adjacent top plates and the layer separation instrument is 25 m; the top plate displacement sensor is arranged in the middle of two adjacent top plate separation level meters.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention predicts L through the convergence quantity of the tunnel1Safety convergence L with the tunnel2Evaluating the safety of the compared construction; according to the grouting anchor cable supporting structure and principle, calculating to obtain the advanced supporting parameters of the grouting anchor cable, and finally obtaining the prediction L of the roadway convergence3Using the safety convergence L of the tunnel2And prediction of tunnel convergence L3Comparing, and feeding back and modifying the advanced support parameters of the grouting anchor cable; according to the maximum of the determined advance support parametersConstructing safety support parameters, monitoring on site to obtain actual convergence L of the tunnel4Using the safety convergence L of the tunnel2Actual convergence with the roadway L4Comparing, and feeding back and modifying the advanced support parameters of the grouting anchor cable; the method for determining the advanced support parameters of the grouting anchor cable has high safety, is convenient and quick and has excellent engineering applicability.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
Fig. 1 is a detailed technical route chart of a research for determining a method for advance support of a grouting anchor cable.
Detailed Description
As shown in fig. 1, a method for determining the advance support of a grouting anchor cable can be divided into three steps, namely, step Z1 construction safety evaluation, step Z2 advance support parameter determination, and step Z3 field industrial test. The construction safety evaluation Z1 has an auxiliary evaluation function on the determination of the advance support parameters Z2 and the field industrial test Z3 and has the function of theoretical and practical foundation.
The construction safety evaluation Z1 mainly comprises roadway convergence prediction L1S3 and roadway safety convergence L2And S14. Prediction of roadway convergence L1S3, analyzing deformation rules of surrounding rocks of the roadway based on engineering geological profile, production conditions and roadway support structure S2, knowing spatial evolution characteristics of surrounding rocks of the roadway, analyzing distribution characteristics of plastic zones, stress distribution characteristics and deformation characteristics of the surrounding rocks, further analyzing the stability of a top plate of a forepoling section, and deducing roadway convergence L according to the stability1And S3. Roadway safety convergence L2S14, determining roadway surrounding rock deformation and damage characteristics under the mining influence of a working face and under the superposition effect of lateral supporting pressure and stress distribution conditions through an analogy method, a numerical simulation and a model test S12 based on roadway advance support specifications S11, determining roadway advance supporting pressure distribution rules by combining drilling detection S13, determining advance support distances, obtaining evolution characteristics of surrounding rock fractures, roof separation characteristics and roof rock stratum integrity, and determining the roadway advance support characteristicsDetermining the safe convergence L of the surrounding rock of the roadway on the premise of ensuring the construction safety2And S14. The detection result obtained by the rock stratum drilling detector comprises a video, a drilling development figure and a histogram of each drilling hole, and the three image information are generally compared in order to facilitate the analysis and processing of the hole wall of the drilling hole. In order to make up for on-site operation conditions, weaken the influence of adverse factors such as water, mud and fog, enhance the attractiveness of images and realize the optimal state, the images are processed by applying an image processing technology. Information such as the position and distance of a probe hole recorded on site is associated with an image, and the depth and destruction state of the hole wall displayed on the image are described. And (4) analyzing the rock body structure and the crack development degree in the drill hole of each station, and observing the crack development condition in the rock body. In order to determine reasonable advance support technical parameters, the range of the surrounding rock loosening zone of the roadway roof is measured actually. In conclusion, the roadway safety convergence L is determined according to the conventional technical means in the field2. Predicting L based on roadway convergence1S3 and roadway safety convergence L2S14, scientifically evaluating construction safety by comparison.
Determining Z2 of advance support parameters, determining stress distribution characteristics and strength criteria of a grouting anchor rope support structure and principle S112, establishing a mechanical constitutive model for a construction roadway, performing theoretical calculation, numerical simulation and simulation experiment S113, determining stress bearing effect and stress distribution characteristics of the grouting anchor rope on a roof, establishing stress evolution characteristics of the roadway and anchoring grouting structure characteristics of the support roadway under the action of mining disturbance of a working face and lateral support pressure, primarily determining advanced support parameters S114 of the grouting anchor rope based on the stress distribution characteristics, selecting the maximum safe support parameters S115 of the grouting anchor rope based on the primary support parameters S114 of the grouting anchor rope on the premise of ensuring safety, and comparing the maximum safe support parameters S115 of the grouting anchor rope with the support structure to obtain roadway convergence prediction L3S116, comparing L2And L3The magnitude of the value. When L is3A value of L or more2When the value of (A) is less than L, the advance support parameters need to be adjusted, and the maximum safe support parameters are reselected until L3Is less than L2Value of (d), through lane safety convergence L2The safety of the selected advance support parameters is improved by the feedback of the parameter. When L is3Is less than L2When the value (2) is (6), the field industrial test Z3 is conducted.
In the field industrial test Z3, in the advance support range of the mining roadway, a grouting anchor rope is adopted for advance support, the grouting anchor rope is used for advance support along the advancing direction of the working face in the mining roadway along with the advancing of the working face, and a certain advance support safety distance is always kept in the mining roadway. And monitoring the advanced support roadway on site, monitoring the surrounding rock fracture evolution rule of the roadway, the mine pressure display rule, the change range of a surrounding rock loosening ring, analyzing the plastic zone distribution characteristic, the stress distribution characteristic and the surrounding rock deformation characteristic, further analyzing the roof stability of the advanced support section, and obtaining the actual convergence L of the roadway4Comparison L2And L4The magnitude of the value. When L is4A value of L or more2If so, the advance support parameters in step Z2 are adjusted to re-determine the advance support parameters until L4Is less than L2Value of (d), through lane safety convergence L2Improving the actual convergence L of the tunnel by the feedback of4The safety of (2). When L is4Is less than L2When the value is greater than the preset value, the grouting anchor cable adopted by the mining roadway is indicated to be safe and reliable for advance support.
The field monitoring in the field industrial test Z3 comprises drilling detection, surface displacement monitoring and roof separation monitoring, and is realized by an online mine pressure observation system, roadway surface displacement detection, a roof separation instrument and a drilling detector. And the roadway surface displacement is detected through an ore pressure manual observation point. The online observation system for the mine pressure comprises a borehole stress meter, a top plate displacement sensor and an anchor cable stress meter. The structures and the use methods of the borehole stressometer, the roof displacement sensor, the anchor cable stressometer, the mine pressure manual observation point, the roof separation instrument and the borehole detector are all the prior art, are conventional technical means of technicians in the field, and are not described herein again. What is peculiar in this specific embodiment is that drilling stress meter, ore pressure manual observation point, roof separation layer appearance, roof displacement sensor, anchor rope stress meter all are provided with a plurality ofly along the tunnel extending direction interval. The drilling stress meter is arranged on the roadway side; the mine pressure manual observation point is arranged on a roof or a roadway side; the roof separation layer instrument, the roof displacement sensor and the anchor cable stress gauge are arranged on the roof. The interval distance between two adjacent borehole stressmeters is 25m, the interval distance between two adjacent mine pressure manual observation points is 25m, the interval distance between two adjacent anchor cable stressmeters is 25m, the interval distance between two adjacent roof separation instruments is 25m, and the roof displacement sensor is arranged in the middle of the two adjacent roof separation instruments.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. A method for determining the advance support of a grouting anchor cable is characterized by comprising the following steps:
z1, predicting roadway convergence L according to field conditions1Determining the safety convergence L of the tunnel according to the advance support standard of the tunnel2Predicting L based on the convergence of the roadway1And the roadway safety convergence L2Establishing operation safety evaluation;
z2, calculating to obtain the advanced support parameters of the grouting anchor cable according to the supporting structure and principle of the grouting anchor cable, selecting the maximum safe support parameters, and obtaining the prediction L of the roadway convergence from the parameters3Comparison L2And L3The magnitude of the value; when L is3A value of L or more2When the value of (A) is less than L, the advance support parameters need to be adjusted, and the maximum safe support parameters are reselected until L3Is less than L2A value of (d); when L is3Is less than L2When the value of (c) is zero, continue to step Z3;
z3, constructing according to the maximum safe support parameter in the determined advance support parameters, and monitoring on site to obtain the actual roadwayAmount of convergence L4Comparison L2And L4The magnitude of the value; when L is4A value of L or more2If so, the advance support parameters in step Z2 are adjusted to re-determine the advance support parameters until L4Is less than L2A value of (d); when L is4Is less than L2When the value is greater than the preset value, the grouting anchor cable adopted by the mining roadway is indicated to be safe and reliable for advance support.
2. The method for determining the advance support of a grouting anchor cable according to claim 1, wherein: prediction of tunnel convergence L in step Z11The field conditions based include engineering geological profiles, production conditions and roadway support structures.
3. The method for determining the advance support of a grouting anchor cable according to claim 1, wherein: the tunnel safety convergence L in step Z12Determining roadway surrounding rock deformation and damage characteristics and stress distribution conditions under the mining influence of a working face and the superposition effect of lateral bearing pressure through an analogy method, numerical simulation and model test based on roadway advanced support specifications, determining a roadway advanced support pressure distribution rule, determining an advanced support distance, obtaining evolution characteristics of surrounding rock cracks, roof separation characteristics and roof rock stratum integrity, determining the roadway safety convergence L on the premise of ensuring construction safety2。
4. The method for determining the advance support of a grouting anchor cable according to claim 3, wherein: in step Z1, the roadway safety convergence L is determined2And (4) detecting in combination with the drilling.
5. The method for determining the advance support of a grouting anchor cable according to claim 3, wherein: in the step Z2, stress distribution characteristics and strength criteria of the grouting anchor cable are determined according to a supporting structure and a principle of the grouting anchor cable, a mechanical constitutive model is established according to a construction roadway, theoretical calculation, numerical simulation and simulation experiments are carried out, stress bearing effect and stress distribution characteristics of the grouting anchor cable on a top plate are determined, stress evolution characteristics of the supporting roadway under the action of mining disturbance of the working face and lateral supporting pressure and anchoring grouting structure characteristics are established, and advanced supporting parameters of the grouting anchor cable are preliminarily determined based on the stress distribution characteristics.
6. The method for determining the advance support of a grouting anchor cable according to claim 1, wherein: step Z3, advance supporting is carried out on the mining roadway by adopting a grouting anchor rope within the advance supporting range, the grouting anchor rope advance supporting is carried out on the mining roadway along the advancing direction of the working face along with the advancing of the working face, a certain advance supporting safety distance is always kept in the mining roadway, the advance supporting roadway is monitored on site, the surrounding rock fracture evolution law of the roadway, the mine pressure display law, the change range of a surrounding rock loosening ring, the plastic zone distribution characteristic, the stress distribution characteristic and the surrounding rock deformation characteristic are analyzed, the roof stability of the advance supporting section is further analyzed, and the actual convergence L of the roadway is obtained4。
7. The method for determining the advance support of a grouting anchor cable as claimed in claim 6, wherein: the in-situ monitoring in step Z3 includes borehole sounding, surface displacement monitoring, and roof delamination monitoring.
8. The method of determining the advance support of a grouted cable bolt of claim 7, wherein: the on-site monitoring in the step Z3 is realized by an online mine pressure observation system, roadway surface displacement detection, a roof separation instrument and a drilling detector; the online mine pressure observation system comprises a borehole stress meter, a top plate displacement sensor and an anchor cable stress meter; detecting the displacement of the roadway surface through an ore pressure manual observation point; the drilling stress meter, the mine pressure manual observation point, the roof separation instrument, the roof displacement sensor and the anchor cable stress meter are all provided with a plurality of in the extending direction of the roadway at intervals.
9. The method for determining the advance support of a grouting anchor cable as claimed in claim 8, wherein: the drilling stress meter is arranged on the roadway side; the mine pressure manual observation point is arranged on the roof or the roadway side; the roof separation layer instrument, the roof displacement sensor and the anchor cable stress gauge are arranged on the roof.
10. The method of determining the advance support of a grouted cable bolt of claim 9, wherein: the spacing distance between two adjacent borehole stressmeters is 25 m; the spacing distance between two adjacent ore pressure manual observation points is 25 m; the spacing distance between two adjacent anchor cable stressometers is 25 m; the spacing distance between two adjacent top plates and the layer separation instrument is 25 m; the top plate displacement sensor is arranged in the middle of two adjacent top plate separation level meters.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111581833A (en) * | 2020-05-13 | 2020-08-25 | 中国矿业大学 | Method for designing reinforced support of anchor cable at advanced section of mining roadway |
| CN113669095A (en) * | 2021-08-02 | 2021-11-19 | 中国矿业大学 | Advanced support method applied to ultra-high section of mining roadway |
| CN113790083A (en) * | 2021-08-30 | 2021-12-14 | 安徽建筑大学 | Method for repairing and treating soft rock roadway floor of coal mine |
| CN115758671A (en) * | 2022-10-25 | 2023-03-07 | 山东科技大学 | Method, system and application for managing whole life cycle of reinforced bolting-grouting support of surrounding rock roadway |
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