CN113006840A - Combined support method for resin anchor cables with different lengths in deep altered rock type roadway - Google Patents
Combined support method for resin anchor cables with different lengths in deep altered rock type roadway Download PDFInfo
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- CN113006840A CN113006840A CN202110254538.5A CN202110254538A CN113006840A CN 113006840 A CN113006840 A CN 113006840A CN 202110254538 A CN202110254538 A CN 202110254538A CN 113006840 A CN113006840 A CN 113006840A
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- 239000011435 rock Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000011347 resin Substances 0.000 title claims abstract description 33
- 229920005989 resin Polymers 0.000 title claims abstract description 33
- 230000008093 supporting effect Effects 0.000 claims abstract description 39
- 238000011156 evaluation Methods 0.000 claims abstract description 10
- 238000013461 design Methods 0.000 claims abstract description 7
- 238000011835 investigation Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 29
- 239000010959 steel Substances 0.000 claims description 29
- 238000005507 spraying Methods 0.000 claims description 14
- 239000011378 shotcrete Substances 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 10
- 239000004567 concrete Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 238000000691 measurement method Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 11
- 238000005065 mining Methods 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
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- 239000003673 groundwater Substances 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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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
- E21D11/14—Lining predominantly with metal
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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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- Life Sciences & Earth Sciences (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Architecture (AREA)
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Abstract
The application provides a combined support method for resin anchor cables with different lengths in a deep altered rock type roadway, and relates to the technical field of deep altered rock type roadway support. The method comprises the following steps: the method comprises the following steps: performing rock mechanics investigation on the structural surface condition of the surrounding rock of the roadway; step two: performing rock mass geomechanics RMR grading evaluation based on a rock mechanics survey result; step three: manufacturing an RMR graded supporting chart based on the RMR graded evaluation result of rock mass geomechanics, and carrying out supporting design; step four: potential wedge body identification is carried out on the roadway by using Unwedge software; step five: respectively supporting a roadway top plate and two sides by using resin anchor rods; step six: and adopting a plurality of resin anchor cables with different lengths to support the roadway roof. The method has the advantages of reasonable design, simple construction, safety, reliability and good construction effect, can improve the supporting effect of the deep altered rock type tunnel, and can effectively ensure the stability of surrounding rocks of the tunnel in a service period.
Description
Technical Field
The application relates to the technical field of deep altered rock type roadway support, in particular to a combined support method for resin anchor cables with different lengths in a deep altered rock type roadway.
Background
The altered rock type roadway has a high stress phenomenon, which is a main difficult problem for restricting normal construction of the roadway. In the process of partially developing roadway excavation, due to the poor supporting effect of the prior art, the phenomenon of secondary pressure is easy to occur, the prior support is damaged, collapse occurs, unsafe factors are more and more difficult in the process of recovering the roadway, the roadway construction speed is reduced, and the continuity of construction cannot be ensured.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a combined support method for resin anchor cables with different lengths in a deep altered rock type roadway, so that the support effect of the high-stress altered rock type roadway is improved, the construction speed of the roadway is accelerated, and the beneficial effects of production continuity are ensured.
The application provides a combined support method for resin anchor cables with different lengths in a deep altered rock type roadway, which comprises the following steps:
the method comprises the following steps: performing rock mechanics investigation on the structural surface condition of the surrounding rock of the roadway;
step two: performing rock mass geomechanics RMR grading evaluation based on a rock mechanics survey result;
step three: manufacturing an RMR graded supporting chart based on the RMR graded evaluation result of rock mass geomechanics, and carrying out supporting design;
step four: potential wedge body identification is carried out on the roadway by using Unwedge software;
step five: respectively supporting a roadway top plate and two sides by using resin anchor rods;
step six: adopting a plurality of resin anchor cables with different lengths to support a roadway roof;
step seven: adopting double steel bars to respectively support a plurality of roadway roofs;
step eight: respectively spraying concrete to the top plate and the two sides of the roadway;
step nine: and three roadway surrounding rock convergence deformation continuous monitoring systems are respectively arranged on a roadway top plate, two sides and a bottom plate and are used for monitoring convergence deformation values of roadway surrounding rocks before and after supporting and evaluating the supporting effect.
Preferably, the rock mass geomechanics RMR classification method in the second step includes: firstly, carrying out field measurement by using a line measurement method to obtain parameters such as related parameters RQD value, joint interval, joint condition, underground water and the like, and then obtaining the rock strength by using a point load tester; and the obtained five parameters are brought into rock mass geomechanics RMR grading calculation to obtain RMR scores, and the rock grades are judged by contrasting an obtained score table.
Preferably, the second step further comprises: when classifying, scoring according to the standard of the table according to the numerical values of various indexes, summing to obtain a total score RMR value, and then properly correcting the total score according to the specification of the table; and finally, solving the category of the rock mass to be researched by using the corrected total score comparison table.
Preferably, in the fifth step, 4-5m long resin anchor cables are adopted for supporting, the supporting distance between adjacent anchor cables is 1 m/root, and the row spacing is 2 m.
Preferably, the double steel bars in the sixth step are welded by two round steel or deformed steel bars with the diameter of 8-14 mm; the distance between two adjacent reinforcing bars is 6-8cm, the length is 1.4m, the end of two reinforcing bars is equipped with the tray, the length, width and height size of tray is 150X 8mm respectively, the length of two reinforcing bars can cover whole tunnel arch portion completely.
Preferably, the sixth step further comprises: when the support is used, the double steel bars are installed along the arch contour of the roadway by using a row of anchor rods according to a preset interval, and all parts of the double steel bars are tightly attached to the wall surface of the roadway, so that the aim of quickly forming the integral support ring is fulfilled.
Preferably, the thickness of the sprayed concrete in the step eight is 5-10cm, and the thickness of the initial spraying is 3 cm.
Preferably, the monitoring period in the ninth step is one month.
The beneficial effect of this application lies in:
1. the method is used for grading the quality of rock mass based on rock mechanics investigation, carrying out support design based on a support chart of RMR grading, identifying potential wedges in the roadway by using Unwedge software, analyzing and improving the provided support scheme, and providing a support mode of 'long anchor cables with different lengths, double steel bars and sprayed concrete', so that the support effect of the high-stress-alteration rock roadway is improved, the construction speed of the roadway is accelerated, and the continuity of production is ensured.
2. The invention adopts double-steel bar support, which has good effect on the stability of the key block, because the whole row of anchor rod groups are combined under the action of the supporting plate in the support process, thereby leading the key block which is likely to fall to be in a stable state.
3. By adopting the long anchor cables with different lengths, the double steel bars and the sprayed concrete, the concrete and the rock mass can be quickly formed into a good supporting and protecting ring by spraying the concrete, so that the rock weathering and the collapse deformation are avoided.
In addition, the design principle of the application is reliable, the structure is simple, and the application prospect is very wide.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the construction method of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The following explains key terms appearing in the present application.
As shown in fig. 1, the method for jointly supporting the resin anchor cables in the deep altered rock roadway with different lengths provided by the application comprises the following steps:
the method comprises the following steps: performing rock mechanics investigation on the structural surface condition of the surrounding rock of the roadway;
step two: performing rock mass geomechanics RMR grading evaluation based on a rock mechanics survey result;
step three: manufacturing an RMR graded supporting chart based on the RMR graded evaluation result of rock mass geomechanics, and carrying out supporting design;
step four: potential wedge body identification is carried out on the roadway by using Unwedge software;
step five: respectively supporting a roadway top plate and two sides by using resin anchor rods;
step six: adopting a plurality of resin anchor cables with different lengths to support a plurality of roadway roofs;
step seven: adopting double steel bars to support the roadway roof respectively;
step eight: respectively spraying concrete to the top plate and the two sides of the roadway;
step nine: and three roadway surrounding rock convergence deformation continuous monitoring systems are respectively arranged on a roadway top plate, two sides and a bottom plate and are used for monitoring convergence deformation values of roadway surrounding rocks before and after supporting and evaluating the supporting effect.
Wherein, the second step further comprises: when classifying, scoring according to the standard of the table according to the numerical values of various indexes, summing to obtain a total score RMR value, and then properly correcting the total score according to the specification of the table; and finally, solving the category of the rock mass to be researched by using the corrected total score comparison table.
The rock mass geomechanics RMR grading method in the step two comprises the following steps: firstly, carrying out field measurement by using a line measurement method to obtain parameters such as related parameters RQD value, joint interval, joint condition, underground water and the like, and then obtaining the rock strength by using a point load tester; and the obtained five parameters are brought into rock mass geomechanics RMR grading calculation to obtain RMR scores, and the rock grades are judged by contrasting an obtained score table.
The present embodiment uses a line-measuring method for field investigation. The line measuring method is to arrange a measuring line in a certain direction on the natural or artificial outcrop of the rock mass and measure the opening degree, the attitude and other parameters of the joints intersected with the measuring line. In other embodiments, statistical windowing may also be used for field surveys. The statistical window method comprises the steps of selecting measuring points on a measuring line at intervals of 10-20 m, taking measuring surfaces with a certain area around the measuring points, measuring joint opening, attitude and positions on the measuring surfaces, then carrying out joint grouping on all joints according to the attitude, and taking the average value of the joint opening and the joint interval of each group as the opening and the joint interval of a crack.
In the embodiment, four areas are surveyed together, namely-630 m subsection, -915m middle section, -960m middle section and-960 m-1140 m slope ramp in the west mountain mining area, and 323m roadway and 473 joints are surveyed. The rock strength indexes of three areas, namely-535 middle section, -580 middle section and-630 middle section, are measured by using a point load tester, and table 1 is a point load strength corresponding table of the three areas measured by using the point load tester.
TABLE 1
TABLE 2
Table 2 shows the rock geomechanical (RMR) classification parameters and their scores. As shown in table 2, in this embodiment, the rmr (rockmassrating) classification system is composed of five indexes, i.e., rock strength, RQD value, joint spacing, joint conditions, and groundwater. When classifying, scoring according to the standard of Table 2.14A according to the numerical value of each index, summing to obtain the total score RMR value, and then making appropriate correction according to the specification of Table 2.14B and Table 2.15. And finally, solving the category of the rock mass to be researched, the self-stabilization time of the corresponding non-support underground engineering and the rock mass strength index (c, phi) value by using the corrected total score comparison table.
TABLE 3
Table 3 shows the values of the correction scores for the joint direction, which are corrected using the above scoring criteria.
TABLE 4
Table 4 shows the rock mass grade and rock mass quality evaluation table determined based on the total score. And (4) dividing the rock mass into five grades according to the total score value, wherein the quality of the rock mass of each grade is different.
TABLE 5
Table 5 is used to reflect the effect of joint strike and dip on tunnel excavation. RMR rock mass classification originally developed for solving shallow tunnel engineering in hard jointed rock mass. From the field application, the use is simpler and more convenient, and the rock mass score value is useful in most occasions.
| Total value of credit | 81～100 | 61～80 | 41～60 | 21～40 | 0～20 |
| Grade | Ⅰ | Ⅱ | Ⅲ | Ⅳ | Ⅴ |
| Quality of | Is very good | Good taste | In general | Difference (D) | Extreme difference |
TABLE 6
Table 6 is the RMR rock mass quality grading standard, which grades the rock mass into five according to the total score value.
TABLE 7
Table 7 shows the results of the RMR rock mass quality classification evaluation. According to the indexes, the quality grading evaluation of each middle section rock mass is shown in table 7 according to the mining area engineering geology, hydrogeological conditions, mineral body occurrence conditions, joint fracture development rule investigation, mining area ground stress measurement, mineral rock mechanical property test results and the like.
TABLE 8
In the third step, according to the RMR scoring condition, the corresponding supporting mode is selected by comparing with the table 8.
And in the fifth step, 4-5m long resin anchor cables are adopted for supporting, the supporting distance between every two adjacent anchor cables is 1m, and the row spacing is 2 m. The selected supporting mode is simulated by Unwedge software (the Unwedge is interactive software suitable for analyzing the stability of a three-dimensional wedge body formed by discontinuous structure and underground excavation), and the effect of the supporting mode is checked. On the basis of Unwedge software simulation, clicking a PerimetSuperportDesigner, and then inputting relevant resin anchor rod parameters, wherein the length is 2m, the distance is 1m, the row spacing is 2m, and a supporting plan can be generated clockwise or anticlockwise. And clicking the 3D wedge view to see the 3D effect, wherein the lower right corner in the figure shows that the potential wedge safety coefficient of the top plate is changed to 20.
In the sixth step, the double steel bars are formed by welding two round steel or deformed steel bars with the diameter of 8-14 mm; the distance between two adjacent reinforcing bars is 6-8cm, the length is 1.4m, the end of two reinforcing bars is equipped with the tray, the length, width and height size of tray is 150X 8mm respectively, the length of two reinforcing bars can cover whole tunnel arch portion completely. When the support is used, the double steel bars are installed along the arch contour of the roadway by using a row of anchor rods according to a preset interval, and all parts of the double steel bars are tightly attached to the wall surface of the roadway, so that the aim of quickly forming the integral support ring is fulfilled.
And sixthly, surveying the field data according to a previous field line measuring method, inputting the field data into software for analysis to obtain parameters such as the height, the weight and the like of the wedge body, and selecting the resin anchor cable with a proper length according to the position and the height shape of the part with the wedge body through software simulation analysis. In order to avoid excessive support and insufficient support, the wedge body is used for identifying, so that resin anchor cable supports with different positions and lengths are obtained, and finally the safety is achieved.
And carrying out potential wedge body identification on the roadway by using Unwedg software according to the relevant information of the structural plane survey result. And carrying out support analysis on the support scheme provided according to the rock mechanics grading result. When the resin anchor rod with the length of 2m is adopted, the wedge body is not integrated with the upper rock, and the collapse is easily caused. Therefore, in order to ensure the stability of the wedge body and prevent collapse, 3 long anchor cables with the length of 5m are adopted for supporting the wedge body at the right upper part of the roadway, and the supporting row spacing is 2m and 1 m.
The identification of the largest potential wedge by the Unwedge software shows that: the safety coefficient of the potential wedge-shaped block of the roadway roof is 0, the potential wedge-shaped block is extremely unstable and has a collapse danger, and after the resin anchor rod support with the row spacing of 2m, the spacing of 1m and the length of 2m is adopted, the safety coefficient of the potential wedge-shaped block of the roadway roof is changed into 20 and is still unstable, and great potential safety hazards exist. When the distance between the resin anchor rods is 1m, the row distance is 2m, the length of the anchor rods is 2m, the long anchor cable supporting length is increased by 5m at the wedge body part at the upper right part of the top plate, the safety coefficient of the potential wedge bodies of the three rear top plates with the row distance of 2m and the distance of 1m is changed into 356.386, and the stability of a roadway can be kept.
In the seventh step, two round bars with the diameter phi of 10-12 mm are used by workers for field welding. The length of the whole double-reinforcing steel bars is determined according to the conditions of a roadway top plate and two sides, and the principle is that the place with the anchor rod and the anchor cable is covered by the double-reinforcing steel bars. And a connecting point is welded between the double reinforcing steel bars at intervals of 0.5m, and the distance between the connecting points is determined according to the distance between the anchor rods and the anchor cables, so that the installation and the use of the anchor rod and anchor cable tray cannot be influenced. In the construction process, firstly, a roof anchor rod is constructed, double steel bars are fixed on a roof, and then an anchor rod anchor cable is constructed according to the arch profile of a roadway, so that the double steel bars and the anchor rod anchor cable tray are tightly attached to the rock wall, the double steel bars of the anchor rod anchor cable form an integral arch, and the effect of combining the arches is achieved.
According to the effect of earlier stage double-steel bar support, adopt anchor rod anchor rope double-steel bar support mode for the three forms a whole, and the interact forms a combination arch effect, makes its anchor rod anchor rope that originally plays the effect alone, connects and becomes a whole, has greatly improved the holistic ability to resist risk in tunnel, has guaranteed that the tunnel is stable. The anchor rod anchor cable is connected together by the double steel bars and is particularly important in the altered rock mass, the anchor rod anchor cable can be quickly supported, the roadway is changed into a unified whole in the early deformation stage of the roadway, the whole function is exerted, the double steel bars have certain flexibility, the deformation can be properly carried out, the anchor rod anchor cable belongs to flexible support, and the anchor rod anchor cable is more suitable for deep mining.
In the eighth step, the thickness of the sprayed concrete is 5-10cm, and the thickness of the initial spraying is 3 cm. And (4) treating the rock surface, and washing the sprayed rock surface by using high-pressure water. Specifically, the concrete spraying is the spraying construction of a manipulator, and equipment is operated by a skilled spraying hand; in order to reduce the rebound quantity, ensure the quality of sprayed concrete, keep the stable state of wind pressure, adjust at any time, and meet the requirements that the pressure at a spray head is about 0.1MPa and the wind pressure of a spraying machine is controlled to be 0.4-0.5 MPa. Jetting in blocks from bottom to top; the sprayed material beam moves in a spiral track, is pressed for a half circle by a circle, and moves from bottom to top in a wave shape. The angle between the sprayed material beam and the sprayed surface is controlled within 75-105 degrees and does not exceed the range. And (3) performing primary concrete spraying, controlling the spraying thickness to be 2-5 cm and the average thickness to be 3cm, then constructing a resin anchor cable and a reinforcing mesh, and finally performing final spraying, wherein the vector chord ratio is not more than 1/6. And after the concrete is sprayed for 2 hours, water spraying curing is carried out, and the curing time is 14 days. After the construction of the sprayed concrete is finished, checking whether the sprayed concrete is dense and flat, and has no phenomena of cracks, falling off, spray leakage, hollowing and water leakage; and for defective areas such as hollowing, knocking off and re-constructing. And observing and recording the sprayed concrete surface, taking pictures and recording the pictures, and recording the construction condition in detail. The monitoring period in the ninth step is one month.
According to the method, after the deep altered rock type roadway is supported by the long anchor cables with different lengths, the double steel bars and the sprayed concrete, the deformation of the surrounding rock of the monitored section tends to be stable, and the accumulated deformation of the surrounding rock does not increase within a monitoring period of one month. Therefore, the support mode and the support parameters can effectively ensure the stability of the surrounding rock of the coke gold mine roadway in the service period.
The cost saving amount is the economic value of the new process cost (the average advanced unit cost of the old process and the unit cost of the new process) multiplied by the actual yield of the calculation period-the technological investment amount. Saving the cost of supporting and supporting 1000 yuan/m.
Although the present application has been described in detail with reference to the accompanying drawings in conjunction with the preferred embodiments, the present application is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present application by those skilled in the art without departing from the spirit and scope of the present application, and these modifications or substitutions are intended to be covered by the present application/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. The combined support method for the resin anchor cables with different lengths in the deep altered rock roadway is characterized by comprising the following steps of:
the method comprises the following steps: performing rock mechanics investigation on the structural surface condition of the surrounding rock of the roadway;
step two: performing rock mass geomechanics RMR grading evaluation based on a rock mechanics survey result;
step three: manufacturing an RMR graded supporting chart based on the RMR graded evaluation result of rock mass geomechanics, and carrying out supporting design;
step four: potential wedge body identification is carried out on the roadway by using Unwedge software;
step five: respectively supporting a roadway top plate and two sides by using resin anchor rods;
step six: adopting a plurality of resin anchor cables with different lengths to support a plurality of roadway roofs;
step seven: adopting double steel bars to support the roadway roof respectively;
step eight: respectively spraying concrete to the top plate and the two sides of the roadway;
step nine: and three roadway surrounding rock convergence deformation continuous monitoring systems are respectively arranged on a roadway top plate, two sides and a bottom plate and are used for monitoring convergence deformation values of roadway surrounding rocks before and after supporting and evaluating the supporting effect.
2. The combined support method for the resin anchor cables in the deep altered rock type roadway with different lengths according to claim 1, is characterized in that: the rock mass geomechanics RMR grading method in the step two comprises the following steps: firstly, carrying out field measurement by using a line measurement method to obtain parameters such as related parameters RQD value, joint interval, joint condition, underground water and the like, and then obtaining the rock strength by using a point load tester; and the obtained five parameters are brought into rock mass geomechanics RMR grading calculation to obtain RMR scores, and the rock grades are judged by contrasting an obtained score table.
3. The combined support method for the resin anchor cables in the deep altered rock type roadway with different lengths according to claim 1, is characterized in that: the second step further comprises: when classifying, scoring according to the standard of the table according to the numerical values of various indexes, summing to obtain a total score RMR value, and then properly correcting the total score according to the specification of the table; and finally, solving the category of the rock mass to be researched by using the corrected total score comparison table.
4. The combined support method for the resin anchor cables in the deep altered rock type roadway with different lengths according to claim 1, is characterized in that: and fifthly, supporting by using long resin anchor cables of 4-5m, wherein the supporting distance between adjacent anchor cables is 1 m/root, and the row spacing is 2 m.
5. The combined support method for the resin anchor cables in the deep altered rock type roadway with different lengths according to claim 1, is characterized in that: in the sixth step, the double steel bars are formed by welding two round steel or deformed steel bars with the diameter of 8-14 mm; the distance between two adjacent reinforcing bars is 6-8cm, the length is 1.4m, the end of two reinforcing bars is equipped with the tray, the length, width and height size of tray is 150X 8mm respectively, the length of two reinforcing bars can cover whole tunnel arch portion completely.
6. The deep altered rock type roadway resin anchor cable combined supporting method according to claim 5, characterized in that: the sixth step further comprises: when the support is used, the double steel bars are installed along the arch contour of the roadway by using a row of anchor rods according to a preset interval, and all parts of the double steel bars are tightly attached to the wall surface of the roadway, so that the aim of quickly forming the integral support ring is fulfilled.
7. The combined support method for the resin anchor cables in the deep altered rock type roadway with different lengths according to claim 1, is characterized in that: and in the step eight, the thickness of the sprayed concrete is 5-10cm, and the thickness of the primary sprayed concrete is 3 cm.
8. The combined support method for the resin anchor cables in the deep altered rock type roadway with different lengths according to claim 1, is characterized in that: the monitoring period in the ninth step is one month.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114297824A (en) * | 2021-12-03 | 2022-04-08 | 山东科技大学 | Design method of deep high-stress hard rock plate cracking rock explosive energy release supporting system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1506868A (en) * | 1974-08-29 | 1978-04-12 | Kennametal Inc | Method of securing roof bolts in a mine roof |
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