CN-122015606-A - Gas storage joint vibration reduction method by combining zonal peak-shifting blasting and damping curtain

CN122015606ACN 122015606 ACN122015606 ACN 122015606ACN-122015606-A

Abstract

The invention provides a gas storage joint vibration reduction method by combining zonal peak-shifting blasting and damping curtain, and belongs to the technical field of compressed air energy storage. The method comprises the steps of dividing an excavation face of a gas storage into a core slitting area, an auxiliary expanding area and a peripheral light explosion area from inside to outside, arranging a plurality of rows of inclined vibration damping holes which are staggered in surrounding rocks outside the peripheral light explosion area, filling energy-absorbing vibration damping materials into the vibration damping holes to enable the vibration damping holes to be tightly adhered to a hole wall for solidification, forming a multi-layer damping curtain with energy-absorbing characteristic at the periphery of a design contour line, respectively arranging blast holes and filling explosive rolls in the three areas, and carrying out zonal delay peak-shifting detonation according to the sequence from inside to outside. The method provided by the embodiment of the invention can solve the problems that the passive vibration reduction means cannot construct a vibration reduction barrier with energy absorption characteristic and bearing capacity in deep high-ground stress surrounding rock and additional excavation space is required in the prior art.

Inventors

LUO YI
Deng Yunchen
XU TAO
SHE ZIQIANG
TENG XUN
LIN ZHEN

Assignees

武汉理工大学

Dates

Publication Date: 20260512
Application Date: 20260327

Claims (10)

1. The gas storage joint vibration reduction method combining zonal peak-shifting blasting and damping curtain is characterized by comprising the following steps: Dividing an excavation face of a gas storage into a core slitting area, an auxiliary expanding area and a peripheral photo-explosion area from inside to outside, arranging a plurality of rows of inclined vibration reduction holes in surrounding rocks outside the peripheral photo-explosion area, wherein the plurality of rows of vibration reduction holes are staggered, and the vibration reduction holes are obliquely drilled outside a design contour line at a preset external insertion angle; Filling energy-absorbing vibration-absorbing materials into the vibration-absorbing holes, enabling the energy-absorbing vibration-absorbing materials to be tightly adhered to the hole walls for solidification, and forming a multi-layer damping curtain with energy-absorbing characteristics on the periphery of the designed contour line; and thirdly, respectively forming blast holes in the core cutting area, the auxiliary expanding and digging area and the peripheral light explosion area, filling the explosive rolls, and carrying out partition delay peak-shifting detonation on the three areas according to the sequence from inside to outside on the core cutting area, the auxiliary expanding and digging area and the peripheral light explosion area.
2. The method for jointly damping the gas storage in the cooperation of the partition peak-shifting blasting and the damping curtain is characterized in that the energy-absorbing and damping material is a polyurethane-rubber particle composite foaming material and comprises, by weight, 100 parts of isocyanate, 80-100 parts of combined polyether, 30-50 parts of waste rubber powder, 10-20 parts of hollow glass beads and 5-10 parts of foaming agent, wherein the particle size of the waste rubber powder is 20-40 meshes.
3. The method for jointly damping the gas storage in cooperation with the partition peak-staggering blasting and damping curtain according to claim 1, wherein in the second step, before the energy-absorbing vibration-damping material is filled in the vibration-damping hole, a flexible constraint bag with a grouting pipe preset is sent to the bottom of the vibration-damping hole, the flexible constraint bag is woven by high-strength geotextile or nylon fiber, the outer layer of the flexible constraint bag is coated with a microporous breathable film, and the energy-absorbing vibration-damping material is injected into the flexible constraint bag through the grouting pipe for foaming and filling.
4. The method for jointly damping the gas storage in cooperation with the partition peak-shifting blasting and damping curtain according to claim 3, wherein the grouting pipe is a hollow PVC or PE pipe, a plurality of grouting holes are formed in the grouting pipe, and the grouting holes are arranged at intervals along the length direction of the grouting pipe.
5. The method for jointly damping the gas storage in the cooperation of partition peak-shifting blasting and damping curtains according to claim 3, wherein the input end of the grouting pipe is provided with a one-way grouting valve, and the bag mouth end of the flexible constraint bag is provided with a self-locking grouting plug.
6. The method for jointly damping gas storage in cooperation with partition peak-shifting blasting and damping curtains according to claim 1, wherein the blast holes on the peripheral photo-blasting areas are peripheral holes, the damping holes are arranged in a plurality of rows, the first row is 30cm away from the peripheral holes of the peripheral photo-blasting areas, the distance between adjacent rows is 30cm, the external insertion angle alpha 1 of each row of damping holes is 10-15 degrees, the hole distance between adjacent damping holes in the same row is 60-80 cm, and the depth of the damping holes in the ith row is the same as that of the damping holes in the other row Is determined according to the following formula: ; Wherein alpha 1 is the external insertion angle of the vibration damping hole, For the horizontal distance between the damping hole of the ith row and the blast hole, For the blasthole depth, λ is a safety factor and λ >1.
7. The method for jointly damping the gas storage in cooperation with the partition peak-staggering blasting and damping curtain according to claim 1, wherein the core cutting area is located at the geometric center of a tunnel face, compound wedge cutting is adopted, the compound wedge cutting is arranged in a rectangular or square hole distribution mode, the size of the auxiliary cutting area is 0.2-0.3 times of the diameter of a cavity, the auxiliary cutting area is arranged around the core cutting area, the outer boundary of the auxiliary cutting area is 60-80 cm away from a design contour line, the inner boundary of the peripheral light blasting area is the outer boundary of the auxiliary cutting area, and the outer boundary is located on the design contour line.
8. The method for jointly damping the gas storage in the cooperation of the partition peak-staggering blasting and the damping curtain according to claim 1 is characterized in that the time delay of the partition peak-staggering blasting is set to be equal to or more than 50ms in a time interval delta t 1 between a core cut area and an auxiliary digging area, the time interval delta t 2 between the auxiliary digging area and a peripheral photo-blasting area is equal to or more than 75ms, and the time delay interval of the inner-outer blasting between adjacent blast hole sections in the same area is 15-25 ms.
9. The method for jointly damping the gas storage in cooperation with the partition peak-staggering blasting and damping curtain according to claim 1, wherein an annular gap is formed between the inner wall of the blasthole and the explosive cartridge, the ratio of the blasthole diameter to the explosive cartridge diameter is 1.3-1.6, multiple sections of explosive cartridges are uniformly arranged in the blasthole at intervals along the length direction, and the distance between every two adjacent sections of explosive cartridges is 20% -30% of the length of the explosive cartridge.
10. The method for jointly damping the gas storage in cooperation with the partition peak-staggering blasting and damping curtain according to claim 1, wherein the damping holes and the blast holes are drilled by the same drilling trolley, the blast holes in the core cut area and the auxiliary expansion cut area are drilled by drill booms in the middle of the drilling trolley, and the damping holes are drilled to the outer side of a design contour line by using a large arm swing angle function while the blast holes in the peripheral light explosion area are drilled by drill booms on two sides of the drilling trolley.

Description

Gas storage joint vibration reduction method by combining zonal peak-shifting blasting and damping curtain Technical Field The invention relates to the technical field of compressed air energy storage, in particular to a gas storage joint vibration reduction method by combining zonal peak-shifting blasting and damping curtain. Background Compressed AIR ENERGY Storage (CAES) is an important means for solving the grid-connected volatility of renewable energy sources and realizing peak clipping and valley filling of a power grid as a large-scale physical energy Storage technology with great potential. The core component of the CAES system is a high-pressure underground gas storage, and the construction form mainly comprises reconstruction of abandoned mine tunnels and new construction of large-section caverns in hard rocks. Unlike conventional traffic tunnels, CAES gas reservoirs have extremely high requirements on the integrity and air tightness of surrounding rocks, and any damage to the surrounding rocks caused by construction can cause high-pressure gas leakage, thus endangering operation safety. Because the gas storage is generally limited by the original abandoned roadway groups and land conditions, the spacing between the caverns is smaller, and the drilling and blasting method is still a main excavation means when reconstruction or new construction is carried out. Therefore, how to effectively control the damage of blasting vibration to nearby built gas reservoirs and surrounding rocks thereof is a key technical problem to be solved in CAES gas reservoir construction. The existing explosion vibration reduction technology is mainly divided into active vibration reduction and passive vibration reduction. Active vibration reduction focuses on optimizing blasting parameters from the source, such as adopting differential blasting, reducing single-stage maximum blasting charge, adopting uncoupled charging and other modes to weaken the intensity of a seismic source, but for deep rock mass excavation with large section and high clamping force, the vibration is difficult to control at an extremely low level while ensuring the construction footage efficiency by simply relying on adjusting the blasting parameters. Passive vibration damping is typically the provision of a wave blocking barrier between the source of the blast and the protected object to intercept and attenuate the propagation of the seismic wave. The passive vibration reduction means commonly used at present comprise excavation of vibration isolation trenches and presplitting blasting. The vibration isolation trench is used for forming a cavity on the ground surface to reflect and block the earthquake waves, and the pre-splitting explosion is used for pre-forming a penetrating crack surface in front of the protection object and attenuating the transmission of stress waves by utilizing the wave impedance difference of the crack surface. However, the conventional passive vibration damping technology has significant limitations when applied to the construction scene of CAES underground gas storage proximity. First, the vibration isolation trench is only suitable for shallow surface environments, cannot be implemented in surrounding rocks between deep underground caverns, and does not have conditions for application in underground engineering. In addition, the presplitting blasting forms a hollow hole or hollow crack structure, and cannot bear surrounding rock stress in a deep high-ground stress environment, so that stress concentration and local surrounding rock instability are easily caused, and the stress state around the gas storage is further deteriorated. In addition, the cavity or the crack formed by the vibration isolation groove has no active energy absorption characteristic, and the vibration isolation groove only depends on interface reflection to passively isolate the earthquake waves, so that the attenuation efficiency of the high-frequency blasting stress wave is limited. More importantly, the existing passive vibration damping schemes mostly need to additionally excavate space between the protected object and the explosion source to arrange the vibration damping structure, which not only increases the excavation engineering amount and the supporting cost, but also often lacks implementation space in CAES gas storage groups with limited cavern spacing. Therefore, a new method for constructing a passive vibration reduction barrier with both active energy absorption and bearing capacity in deep high-ground stress surrounding rock without expanding the excavation section is needed. Disclosure of Invention The embodiment of the invention provides a gas storage joint vibration reduction method combining zonal peak-shifting blasting and damping curtain, which can solve the problems that a passive vibration reduction means cannot construct a vibration reduction barrier with energy absorption characteristics and bearing capacity in deep high-grou