CN115436471A - Method for detecting surrounding rock loosening ring of flood discharge system - Google Patents
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Abstract
The invention discloses a method for detecting surrounding rock loosening ring of a flood discharge system, which comprises the following steps: setting detection constraint conditions and results to be obtained by surrounding rock loosening circle detection according to cavern structure arrangement conditions and surrounding rock geological conditions in the flood discharge system, generating a flood discharge system surrounding rock loosening circle detection scheme, and detecting the flood discharge system surrounding rock loosening circle according to the detection scheme; the detection of the surrounding rock loosening ring adopts a single-hole sound wave detection mode, and the detection scheme comprises the arrangement of test holes in different chambers of the flood discharge system and the structure and/or size parameters of the test holes. According to the structural characteristics of the flood discharge system in the junction project, the detection quality and the detection precision of the surrounding rock loosening ring can be effectively improved under the condition that the construction amount of the detection operation project is ensured to be as small as possible, and the surrounding rock loosening range and the change trend in the grotto construction process, the grotto surrounding rock stability and the surrounding rock support in the construction process can be reliably analyzed according to the detection result.
Description
Technical Field
The invention belongs to the technical field of engineering construction detection, and particularly relates to a method for detecting a surrounding rock loosening ring of a flood discharge system.
Background
A certain hydropower station hub project
In earthquake intensity region, the lithology of the exposed stratum in dam site region is mainly represented by black cloud potassium granite with spot-like wood feet in early stage of Yanshan mountain and second long flower in late stage of KecherianAnd (4) granite. The river bed covering layer is generally 48-57 m thick, the maximum thickness reaches 67.8m, and the river bed covering layer is divided into three layers, namely a floating egg gravel layer, a (sand) egg gravel layer and a floating egg gravel layer from bottom to top.
The hub project comprises a river dam, a flood discharge system, a water diversion power generation system and the like; the flood discharge system comprises a tunnel type flood discharge passage, a straight slope flood discharge tunnel, a vertical shaft flood discharge tunnel reconstructed by utilizing a diversion tunnel at the later construction stage and a reservoir emptying tunnel reconstructed by utilizing a diversion tunnel at the middle construction stage, wherein the tunnel type flood discharge passage, the straight slope flood discharge tunnel and the emptying tunnel are respectively arranged on the right bank of a river, and the vertical shaft flood discharge tunnel is arranged on the left bank of the river. The flood discharge system is an important component part in the junction project of the water station and plays a vital role in the normal operation of the junction project, so that the detection of the surrounding rock loosening ring of the flood discharge system is carried out in the construction process of the flood discharge system, and the important significance in ensuring the construction quality of the flood discharge system is achieved.
Disclosure of Invention
The invention aims to provide a method for detecting a surrounding rock loosening ring of a flood discharge system, which is used for accurately detecting the rock loosening ring of the flood discharge system and realizing accurate evaluation on the quality, the loosening depth range and the like of the surrounding rock of the flood discharge system.
The invention is realized by the following technical scheme:
a method for detecting a surrounding rock loosening ring of a flood discharge system comprises the following steps:
setting detection constraint conditions and results to be obtained by surrounding rock loosening circle detection according to cavern structure arrangement conditions and surrounding rock geological conditions in the flood discharge system, generating a flood discharge system surrounding rock loosening circle detection scheme, and detecting the flood discharge system surrounding rock loosening circle according to the detection scheme;
the detection of the surrounding rock loosening ring adopts a single-hole sound wave detection mode, and the detection scheme comprises the arrangement of test holes in different chambers of the flood discharge system and the structure and/or size parameters of the test holes.
As a further improvement to the above technical solution, the flood discharge system cavern structure includes a cavern type flood discharge passage, a deep hole flood discharge tunnel, a shaft flood discharge tunnel and a vent tunnel, wherein the cavern type flood discharge passage, the deep hole flood discharge tunnel and the vent tunnel are arranged on the same side of the river, the shaft flood discharge tunnel is arranged on the other side of the river, and the shaft flood discharge tunnel and the vent tunnel are respectively reconstructed from the original diversion tunnel.
As a further improvement of the above technical solution, in the tunnel-type spillway and the deep-hole spillway, detection sections are arranged at regular intervals along the length direction of the tunnel-type spillway and the deep-hole spillway, the detection sections are arranged along the cross section direction of the cavern, and a plurality of test holes are arranged at intervals on each detection section, wherein the distance between adjacent detection sections in the tunnel-type spillway is smaller than the distance between adjacent detection sections in the deep-hole spillway, and the number of test holes arranged on each detection section in the tunnel-type spillway is not smaller than the number of test holes arranged on each detection section in the deep-hole spillway.
As a further improvement to the above technical scheme, one detection section is arranged in the tunnel-type spillway at intervals of 150-200 m, and one detection section is arranged in the deep-hole spillway at intervals of 200-300 m;
the test holes arranged on each detection section in each cavern are arranged at intervals along the detection section and are symmetrically arranged along the central axis of the cavern in which the test holes are arranged, wherein the positions of the side wall and the vault of the cavern positioned on one side of the central axis of the cavern are respectively provided with at least one test hole, and the distance between every two adjacent test holes positioned on the same side of the cavern in the height direction is 5-10 m.
As a further improvement to the technical scheme, a detection section is arranged in each of the vertical shaft flood discharging tunnel and the emptying tunnel, and the arrangement position of the detection section in the emptying tunnel is located at the position of the vertical shaft of the emptying tunnel gate.
As a further improvement to the technical scheme, the testing holes arranged on the detection sections in the shaft flood discharging tunnel and the emptying tunnel are arranged at intervals along the detection sections and are symmetrically arranged along the central axis of the cavern where the testing holes are respectively arranged, wherein the positions of the side wall and the vault of the cavern located on one side of the central axis of the cavern are respectively provided with at least one testing hole, and the distance between every two adjacent testing holes located on the same side of the cavern in the height direction is 3-5 m.
As a further improvement to the technical scheme, the test holes arranged on the side wall of the cavern are arranged in a downward inclined manner relative to the horizontal plane, and the downward inclined angle is 3-5 degrees; the test hole arranged on the vault of the cavern is obliquely arranged upwards relative to the horizontal plane, and the upward oblique angle is 15-20 degrees.
As a further improvement to the technical scheme, the aperture of the test hole is 65-80 mm, and the depth of the test hole is 15-20 m.
As a further improvement to the above technical solution, the detection constraint condition is set to minimize the overall detection work workload under the condition of ensuring the loose coil detection requirement.
As a further improvement of the technical scheme, according to the detection of the loosening ring of the surrounding rock of each chamber, the loosening range of the surrounding rock of the upper chamber after the initial excavation of the upper layer of the chamber, and/or the loosening range of the surrounding rock of the middle and lower chambers after the excavation, and the changing trend of the loosening range of the surrounding rock of the upper chamber, and/or the loosening range of the surrounding rock of each chamber after the excavation is finished, and/or the changing trend of the loosening range of the surrounding rock of the chamber during the supporting process and after the supporting is finished are analyzed;
and/or analyzing deformation damage types and deformation depth ranges of the surrounding rocks of the caverns by combining geological data obtained by surrounding rock excavation, and analyzing the stability of the surrounding rocks of the caverns;
and/or generating a cavity surrounding rock supporting scheme according to the cavity surrounding rock stability analysis result, wherein the cavity surrounding rock supporting scheme comprises a surrounding rock supporting mode and supporting time.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the structural characteristics of the flood discharge system in the junction project, the detection quality and the detection precision of the surrounding rock loosening ring can be effectively improved under the condition that the construction amount of the detection operation project is ensured to be as small as possible, and the surrounding rock loosening range and the change trend in the grotto construction process, the grotto surrounding rock stability and the surrounding rock support in the construction process can be reliably analyzed according to the detection result.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of an arrangement mode of test holes on each detection section in a tunnel-type spillway in the detection method of the invention.
FIG. 2 is a schematic structural diagram of an arrangement mode of test holes on each detection section in the medium-length hole spillway tunnel according to the detection method of the invention.
Fig. 3 is a schematic structural diagram of an arrangement mode of the test holes on the detection section of the shaft spillway tunnel in the detection method of the invention.
FIG. 4 is a schematic structural diagram of an arrangement of test holes on a cavity detection section in the detection method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
According to the structural characteristics of the flood discharge system, the detection of the surrounding rock loosening ring of the flood discharge system mainly relates to the detection of the positions of a tunnel type flood discharge passage, a deep hole flood discharge tunnel, a vertical shaft flood discharge tunnel and a blow-down tunnel, is used for detecting the quality of surrounding rock masses of caverns, the unloading loosening influence depth of the surrounding rocks and the like, and is detected in a single-hole sound wave detection mode.
In the flood discharge system in this embodiment, hole-type spillway, deep hole flood discharge tunnel and evacuation tunnel set up in the same side of river, and the shaft flood discharge tunnel sets up in the opposite side of river, and the shaft flood discharge tunnel is rebuilt by original 3# diversion tunnel and is formed, and the evacuation tunnel is rebuilt by original 2# diversion tunnel. The tunnel type flood discharge channel, the deep hole flood discharge tunnel and the vertical shaft flood discharge tunnel in the junction system are used for flood discharge, and the emptying tunnel is used for emptying the reservoir.
According to the arrangement condition of a cavern structure and the geological condition of surrounding rocks in the flood discharge system, wherein the geological condition of the surrounding rocks comprises surrounding rock grading, surrounding rock geological parameters and the like, the results to be obtained by detection constraint adjustment and surrounding rock loosening ring detection are set, a detection scheme of the surrounding rock loosening ring of the flood discharge system is generated, and the surrounding rock loosening ring of the flood discharge system is detected according to the detection scheme.
The generated detection scheme comprises the arrangement of the test holes of different chambers of the flood discharge system, the structure and/or size parameters of the test holes and the like; the method for generating the detection scheme can be that different detection schemes are generated in a flood discharge system model in a mode of modeling the flood discharge system, simulation tests are carried out under different detection schemes to obtain simulation test data under different detection schemes, the test data are compared and analyzed, and an evaluation model is established according to the magnitude of operation construction amount under each detection scheme to obtain the optimal detection scheme.
According to the structure of the flood discharge system cavern, in a cavern type spillway and a deep-hole flood discharge hole, a detection section is arranged at a certain distance along the length direction of the cavern type spillway and the deep-hole flood discharge hole, the detection sections are arranged along the cross section direction of the cavern, and a plurality of test holes are arranged on each detection section at intervals, wherein the distance between adjacent detection sections in the cavern type spillway is smaller than the distance between adjacent detection sections in the deep-hole flood discharge hole, and the number of the test holes arranged on each detection section in the cavern type spillway is not smaller than the number of the test holes arranged on each detection section in the deep-hole flood discharge hole. Through the arrangement, according to the structural characteristics of the tunnel type spillway and the deep-hole spillway, under the condition that the detection quality and the requirements of the loosening ring of the engineering surrounding rock are guaranteed, the operation engineering quantity of construction is reduced through optimizing the arrangement of the test holes.
Only one detection section is arranged in each of the vertical shaft flood discharging tunnel and the emptying tunnel, and the arrangement position of the detection section in the emptying tunnel is located at the position of the vertical shaft of the gate of the emptying tunnel.
In each cavity, the arrangement of each detection section and the arrangement mode of the test holes on each detection section can be optimized in a targeted manner. Determining the number and the position distribution of test hole sites in the tunnel type spillway and the deep hole spillway according to the length and the height of chambers of the tunnel type spillway and the deep hole spillway; arranging one detection section at intervals of 150-200 m in the tunnel type spillway, and arranging one detection section at intervals of 200-300 m in the deep-hole spillway; and the test holes that set up on every detection section in two caverns set up along detecting the section at interval in proper order, and be the symmetry setting along the axis of its place cavern respectively, wherein lie in the position of the cavern side wall and the vault of cavern axis one side and be provided with at least one test hole respectively, on every detection section in cave formula spillway, deep hole flood discharge, promptly, lie in and set up 1 at least test hole on the side wall of its left and right sides respectively, lie in the vault and set up 1 test hole respectively in the position department that is close to both sides side wall. Wherein, in the test holes positioned on the same side of the cavern, the distance between two adjacent test holes and the test hole positioned at the lowest part and the bottom of the cavern in the height direction is 5-10 m.
The testing holes arranged on the detection sections in the shaft flood discharging hole and the emptying hole are also arranged at intervals in sequence along the detection sections and are symmetrically arranged along the central axis of the cavern where the testing holes are respectively arranged, wherein the positions of the side wall and the vault of the cavern located on one side of the central axis of the cavern are respectively provided with at least one testing hole, the testing holes are located on the same side of the cavern, and the distance between every two adjacent testing holes in the height direction is 3-5 m.
In order to improve the detection quality, in each cavern, a test hole arranged on the side wall of the cavern is arranged in a downward inclined mode relative to the horizontal plane, and the downward inclined angle is 3-5 degrees; the test hole arranged on the vault of the cavern is obliquely arranged upwards relative to the horizontal plane, and the upward inclination angle is 15-20 degrees.
The aperture of the test hole is set to be 65-80 mm, and the depth of the test hole is set to be 15-20 m.
The detection method is adopted to detect the loose circle of the surrounding rock, not only the quality of the surrounding rock mass of the system and the unloading loose depth range of the surrounding rock, but also the loose range of the surrounding rock of the upper layer of the cavern after the initial excavation of the upper layer of the cavern, and/or the change trend of the loose range of the surrounding rock of the middle and lower layers of caverns and the loose range of the surrounding rock of the upper layer of cavern after the excavation, and/or the loose range of the surrounding rock of each cavern after the excavation, and/or the change trend of the loose range of the surrounding rock of the cavern in the supporting process and after the supporting is completed are analyzed based on the detection scheme and the detection data collected by the detection scheme;
and/or analyzing deformation damage types and deformation depth ranges of the surrounding rocks of all caverns by combining geological data obtained by surrounding rock excavation, and analyzing the stability of the surrounding rocks of the caverns;
and/or generating a cavern surrounding rock supporting scheme according to the stability analysis result of the cavern surrounding rock, wherein the cavern surrounding rock supporting scheme comprises a surrounding rock supporting mode and supporting opportunity.
The present invention will be described in detail with reference to the chambers shown in fig. 1 to 4 and table 1.
Table 1 shows the structure of each cavern of the flood discharge system, the arrangement scheme of the test holes in the caverns and the construction amount.
TABLE 1 flood discharge system test hole arrangement scheme and operation construction amount
As shown in fig. 1, a detection section is arranged in the cave-type spillway every 150m, and each detection section is provided with 6 test holes; wherein, 2 test holes are respectively arranged on the left side wall and the right side wall, 1 test hole is respectively arranged at the position of the crown arch close to the left side wall and the right side wall, and the test holes are respectively symmetrically arranged along the central axis of the cavern; the setting positions of the test holes are respectively 20m, 14m and 7m relative to the height difference of the bottom plate of the cavity from top to bottom, and the depth of the test holes is 15m.
As shown in fig. 2, a detection section is arranged in the tunnel section of the deep-hole flood discharging tunnel every 200 meters, 4 test holes are arranged on each detection section, wherein 2 test holes are respectively arranged on the left side wall and the right side wall, 1 test hole is respectively arranged at the position of the crown close to the left side wall and the right side wall, and the test holes are respectively and symmetrically arranged along the central axis of the chamber. The setting positions of the test holes are 15m and 8m from top to bottom relative to the height difference of the bottom plate respectively, and the depth of the test holes is 15m.
As shown in fig. 3, the end face of the shaft flood discharge tunnel is of a tunnel type, 1 detection section is arranged in the shaft flood discharge tunnel, 12 test holes are arranged on each detection section, wherein the upper and lower side walls are respectively provided with 5 test holes, 1 test hole is respectively arranged at the position of the crown close to the upper and lower side walls, and the test holes are respectively symmetrically arranged along the central axis of the tunnel. The height difference of the test holes from top to bottom relative to the bottom plate is 20m, 16m, 13m, 10m, 7m and 4m, and the depth of the test holes is 15m.
As shown in fig. 4, the working gate of the emptying opening is a circular end surface before reconstruction and is of an urban door opening type after reconstruction. Arrange 1 in the emptying cave and detect the section, arrange behind the work gate, detect and arrange 12 test holes on the section, wherein upper and lower low reaches side wall sets up 5 test holes respectively, and 1 test hole is arranged respectively to the top arch position that is close to upper and lower low reaches side wall, and the test hole sets up along cavern axis symmetry respectively. The height difference of the test holes from top to bottom relative to the bottom plate is 20m, 16m, 13m, 10m, 7m and 4m, and the depth of the test holes is 15m.
In each cavern, during the operation and construction of the test holes, the hole positions of the test holes can be adjusted within the error range of 0.5 m; the test holes arranged on the side walls of the caverns are arranged in a downward inclined mode relative to the horizontal plane, the inclination angle is 5 degrees, the test holes arranged on the vault of each cavern are arranged in an upward inclined mode relative to the horizontal plane, and the inclination angle is 15 degrees. After the drilling is finished, the drill hole is washed by clear water, and no rock debris or falling blocks can be generated in the hole, so that the normal operation of the detection process is ensured.
According to the excavation layering condition of each cavern in the flood discharge system, after each layer of excavation is finished, the loose circle detection of the surrounding rock of the layer is opened and unfolded.
The detection aiming at the loose circle of the surrounding rock is based on an acoustic wave detection method, the acoustic wave speed is an important index of the physical and mechanical properties of the rock body, the acoustic wave speed not only depends on the strength of the rock body, but also can generate section effects of different degrees when the acoustic wave penetrates through a fractured rock body to cause the reduction of the wave speed, and the phenomenon is related to the development degree, the combination form, the fracture width and filling materials of the rock body structure.
In the embodiment, an RS-ST01C type intelligent rock sound wave detector and an RS-SD30 type single Kong Yifa double-receiving transducer are adopted. Detecting in a drill hole without a metal sleeve and with water coupling; the test probe adopts a one-transmitting double-receiving device, and the distances between a transmitting end and two receiving transducers are respectively 30cm and 50cm. Single-hole sound velocity testing, data acquisition is performed every 0.2m along the hole depth.
The loose circle of the surrounding rock mass of the flood discharge system is detected by adopting the embodiment, so that the loose range of the surrounding rock of the upper-layer cavern after the initial excavation of the upper layer of the cavern, the loose range of the surrounding rock of the lower-layer cavern after the excavation of the middle-lower layer and the change trend of the loose range of the surrounding rock of the upper-layer cavern, the loose range of the surrounding rock of the cavern after the excavation is completely finished, the loose range of the surrounding rock of the cavern during the supporting process and after the supporting is finished and the like are obtained; meanwhile, the classification of the surrounding rocks of the cavern can be subjected to auxiliary rechecking in the mode, and the relaxation range of the surrounding rocks is determined; according to geological data and detection conditions obtained in the excavation process and the like, the deformation damage type and the deformation depth range of the surrounding rock of the system cavern group are reliably analyzed, a basis is provided for surrounding rock stability evaluation and surrounding rock reinforcing support, and the surrounding rock stability evaluation is realized; and analyzing the stability of the surrounding rock by combining the unloading relaxation influence depth according to the evaluation of the stability of the surrounding rock, and generating a supporting scheme aiming at the grotto including a surrounding rock supporting mode, supporting time and the like.
In this embodiment, the blasting influence depth is determined by comparing the average value of the post-blasting wave velocity and the hole bottom stable wave velocity for the flood discharge system.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. used herein refer to the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the products of the present invention are used, and are used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present invention do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. A method for detecting a surrounding rock loosening ring of a flood discharge system is characterized by comprising the following steps:
setting detection constraint conditions and results to be obtained by surrounding rock loosening circle detection according to cavern structure arrangement conditions and surrounding rock geological conditions in the flood discharge system, generating a flood discharge system surrounding rock loosening circle detection scheme, and detecting the flood discharge system surrounding rock loosening circle according to the detection scheme;
the detection of the surrounding rock loosening ring adopts a single-hole sound wave detection mode, and the detection scheme comprises the arrangement of test holes in different chambers of the flood discharge system and the structure and/or size parameters of the test holes.
2. The method for detecting the surrounding rock looseness ring of the flood discharge system according to claim 1, wherein the cavern structure of the flood discharge system comprises a cavern type flood discharge passage, a deep hole flood discharge hole, a vertical shaft flood discharge hole and a vent hole, wherein the cavern type flood discharge passage, the deep hole flood discharge hole and the vent hole are arranged on the same side of a river, the vertical shaft flood discharge hole is arranged on the other side of the river, and the vertical shaft flood discharge hole and the vent hole are respectively reconstructed from an original diversion hole.
3. The flood discharge system surrounding rock loosening ring detection method according to claim 2, wherein a detection section is arranged in a tunnel type flood discharge way and a deep hole flood discharge hole at regular intervals along the length direction of the tunnel type flood discharge way, the detection sections are arranged along the cross section direction of a cavern, a plurality of test holes are arranged on each detection section at intervals, the distance between adjacent detection sections in the tunnel type flood discharge way is smaller than the distance between adjacent detection sections in the deep hole flood discharge hole, and the number of test holes arranged on each detection section in the tunnel type flood discharge way is not smaller than the number of test holes arranged on each detection section in the deep hole flood discharge hole.
4. The method for detecting the loose circle of the surrounding rock of the flood discharge system according to claim 3, wherein one detection section is arranged in the tunnel type flood discharge way at intervals of 150-200 m, and one detection section is arranged in the deep-hole flood discharge way at intervals of 200-300 m;
the test holes arranged on each detection section in each cavern are arranged at intervals along the detection section and are symmetrically arranged along the central axis of the cavern in which the test holes are arranged, wherein the positions of the side wall and the vault of the cavern positioned on one side of the central axis of the cavern are respectively provided with at least one test hole, and the distance between every two adjacent test holes positioned on the same side of the cavern in the height direction is 5-10 m.
5. The method for detecting the loose circle of the surrounding rock of the flood discharge system according to claim 2, wherein a detection section is arranged in each of a flood discharge tunnel and a vent tunnel of the shaft, and the detection section in the vent tunnel is arranged at the position of a gate shaft of the vent tunnel.
6. The flood discharge system surrounding rock looseness ring detection method according to claim 5, wherein the test holes arranged on the detection sections in the shaft flood discharge tunnel and the emptying tunnel are arranged at intervals along the detection sections and are symmetrically arranged along the central axis of the cavern in which the test holes are arranged, at least one test hole is arranged at each of the side wall and the vault of the cavern located on one side of the central axis of the cavern, and the distance between every two adjacent test holes located on the same side of the cavern in the height direction is 3-5 m.
7. The method for detecting the loose circle of the surrounding rock of the flood discharge system according to claim 4 or 6, wherein the test holes arranged on the side wall of the cavern are arranged in a downward inclined manner relative to the horizontal plane, and the downward inclined angle is 3-5 degrees; the test hole arranged on the vault of the cavern is obliquely arranged upwards relative to the horizontal plane, and the upward inclination angle is 15-20 degrees.
8. The method for detecting the loose collar of the surrounding rock of the flood discharge system according to claim 7, wherein the diameter of the test hole is 65-80 mm, and the depth of the test hole is 15-20 m.
9. The method for detecting the loose circle of surrounding rocks of the flood discharge system according to claim 1, wherein the set detection constraint condition is that the construction amount of the overall detection operation is minimum under the condition that the detection requirement of the loose circle is ensured.
10. The flood discharge system surrounding rock loosening ring detection method according to claim 1, characterized in that, according to the detection of the surrounding rock loosening ring of each cavern, the loosening range of the surrounding rock of the upper cavern after the initial excavation of the upper layer of the cavern, and/or the loosening range of the surrounding rock of the middle and lower caverns after the excavation, and/or the loosening range of the surrounding rock of the upper cavern after the excavation, and/or the loosening range of the surrounding rock of each cavern during the supporting process and after the supporting process are analyzed;
and/or analyzing deformation damage types and deformation depth ranges of the surrounding rocks of the caverns by combining geological data obtained by surrounding rock excavation, and analyzing the stability of the surrounding rocks of the caverns;
and/or generating a cavity surrounding rock supporting scheme according to the cavity surrounding rock stability analysis result, wherein the cavity surrounding rock supporting scheme comprises a surrounding rock supporting mode and supporting time.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116879406A (en) * | 2023-09-07 | 2023-10-13 | 山东科技大学 | Tunnel surrounding rock stability evaluation method and control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116879406A (en) * | 2023-09-07 | 2023-10-13 | 山东科技大学 | Tunnel surrounding rock stability evaluation method and control method |
| CN116879406B (en) * | 2023-09-07 | 2023-12-22 | 山东科技大学 | Tunnel surrounding rock stability evaluation method and control method |
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