Underwater rock mass blasting method adopting carbon dioxide fracturing

Abstract

The invention discloses a carbon dioxide fracturing underwater rock mass blasting method. The method comprises the steps that 1, the hole position of a drilling ship or a drilling machine is precisely positioned based on a positioning system; step 2, drilling a fracturing hole in the rock mass by adopting a sleeve as a guide; 3, detonator leg wires of the fracturing pipe are connected, and the fracturing pipe is filled with liquid carbon dioxide; setting a target filling pressure to control a crushing range; 4, the fracturing pipe is lowered to the bottom of the fracturing hole; keeping a detonator leg wire extending out of the sleeve; 5, the fracturing hole is filled with a plugging material and tamped; 6, detonator leg wires are connected and then connected into an ignition bus, and the ignition bus is led to a safety ignition station; the end of the ignition bus is subjected to waterproof insulation treatment; 7, after the evacuated personnel arrive at the safe area and safety alert is set, ignition and detonation are conducted; and 8, after rock breaking, safety is confirmed, and warning is relieved. The sequence of the step 3, the step 1 and the step 2 is not the same. The method has higher environmental protection standards and engineering benefits under complex ocean working conditions.

Description

Technical Field

[0001] The invention relates to the technical field of underwater rock blasting construction, in particular to an underwater rock blasting method for carbon dioxide-induced fracturing. Background Art

[0002] Excavation of deep-sea hard rock is a key process in the construction of offshore bridges, tunnels, pipelines and ports. The current construction methods mainly include:

[0003] The blasting method, which involves drilling and charging explosives to break up rock, has the advantages of high efficiency and low cost. However, the vibration waves, underwater noise and chemical pollutants generated by the explosion significantly disturb the marine ecology. It is also strictly restricted by the Civil Explosives Management Regulations and has a complicated approval process.

[0004] Mechanical crushing method: Mechanical cutting is performed using hydraulic breakers based on ships or underwater robots, rotary cutter heads of milling machines, or tunnel boring machines. Although it can accurately control the excavation contour and has a small environmental impact, it has the disadvantages of high equipment investment and slow construction progress. Its effectiveness is limited by equipment performance and operating accuracy.

[0005] Static crushing: An expansive agent (such as a CaO-based crushing agent) is injected into the borehole, progressively crushing the rock mass through the expansion stress generated by the hydration reaction. This method is vibration-free and safe, but the reaction takes several hours to several days, and the crushing depth is limited by the agent's permeability, making it difficult to meet the timeliness requirements of large-scale projects.

[0006] All of the above methods have inherent technical drawbacks. To adapt to the development of deep-sea and large-scale cross-sea channel projects, this paper proposes a hard rock excavation technology that combines high safety, rock-breaking efficiency, and construction economy to meet the dual demands of high environmental standards and high engineering benefits in complex marine conditions. Summary of the Invention

[0007] The main technical problem to be solved by the present invention is to provide an underwater rock blasting method which has higher environmental protection standards and engineering benefits under complex marine working conditions.

[0008] In order to solve the above technical problems, the present invention provides a method for underwater rock blasting by carbon dioxide fracturing, comprising the following steps:

[0009] Step 1: Accurately locate the drilling vessel or drilling rig hole position based on the positioning system;

[0010] Step 2: Drill a fracture hole in the rock mass using casing as a guide;

[0011] Step 3: Configure the fracture tube; this step includes:

[0012] Step 31: Connect the detonator leg wire of the fracturing tube;

[0013] Step 32: Filling the fracturing tube with liquid carbon dioxide; controlling the fracturing range of the fracturing tube by setting a target filling pressure;

[0014] Step 4: Lower the filled fracturing tube to the bottom of the fracturing hole; keep the detonator leg line extending outside the casing;

[0015] Step 5: Fill the crack hole with sealing material and tamp it down;

[0016] Step 6: Lay the rock-breaking network; this step includes:

[0017] Step 61: Connect the detonator pins of each fracturing tube and then connect them to the ignition busbar;

[0018] Step 62: Lead the ignition busbar to the safety ignition station, and perform waterproof insulation treatment on the end of the ignition busbar;

[0019] Step 7: After evacuating personnel and equipment to a safe area and setting up safety alerts, ignite and detonate;

[0020] Step 8: After the explosion, the alert is lifted after underwater inspection confirms safety;

[0021] Among them, the construction order of step 3, step 1 and step 2 is not specific.

[0022] In a preferred embodiment, in step 1, the precise positioning method of the drilling rig hole position is as follows: the designed hole position of the crack-causing hole is drawn into the GPS measurement software; the drilling rig hole position on the drilling vessel is fed back to the monitoring system in real time through the first positioning system to be compared with the designed hole position in the GPS measurement software.

[0023] In a preferred embodiment, in step 32, the filling step of liquid carbon dioxide includes:

[0024] Step 321: Connect the filling machine to the fracturing pipe and the storage tank filled with liquid carbon dioxide respectively;

[0025] Step 322: This step includes: setting the target refilling pressure of the filling machine; venting the filling pipeline;

[0026] Step 323: Open the filling machine to fill the fracture tube with carbon dioxide.

[0027] In a preferred embodiment, in step 5, the plugging material is quick-drying expansive cement.

[0028] In a preferred embodiment, the specific construction steps of step 5 include:

[0029] Step 51: adding an accelerating agent and an expanding agent to the cement slurry and stirring to obtain a quick-drying expanding cement;

[0030] Step 52: Divide the quick-drying expansive cement into a plurality of cement strips; place the cement strips into the casing and simultaneously compact them until they are filled to the opening of the crack hole;

[0031] Step 53: Remove the cannula from the tear hole.

[0032] In a preferred embodiment, step 2 further includes: after drilling the fracture-inducing hole, inspecting the fracture-inducing hole; the inspection includes: ensuring that the elevation difference between the bottom of the fracture-inducing hole and the bottom of the designed drilled hole does not exceed a specified range.

[0033] In a preferred embodiment, in step 61, the detonator legs of the fracturing tubes are grouped and connected in parallel before being connected to the ignition bus.

[0034] In a preferred embodiment, in the precise positioning of the drilling hole in step 1, the plane deviation between the actual position of the drilling hole and the designed hole position is controlled within 0.1 meters.

[0035] In a preferred embodiment, the fracturing tube is a PVC tube.

[0036] In a preferred embodiment, in step 8, the safety alert includes one or more of the following measures: notifying surrounding units and passing ships; setting up alarm signs; expelling marine life; and performing multiple command confirmations before ignition operations.

[0037] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0038] The method provided by the present invention uses carbon dioxide pre-cracking technology for underwater rock blasting. Compared with traditional methods, it has the following technical advantages: 1) Reduced negative impacts on the marine environment, with significant ecological and environmental advantages. 2) Non-chemical explosion and minimal vibration damage significantly reduce safety risks. 3) The fully enclosed design and high-precision crushing control enable this method to adapt to complex working conditions, thus having wide applicability in engineering projects. 4) Effectively reduce cost input, improve construction accuracy, and shorten the construction period, thereby optimizing the overall construction benefits.

[0039] Furthermore, compared to existing attempts at underwater rock blasting using carbon dioxide fracturing, the method provided by this invention offers the following technical improvements: It utilizes a sophisticated positioning system to achieve centimeter-level precision positioning of the drilling vessel and drilling rig; sets the target filling pressure of the filling machine based on the designed depth of the fracturing hole, precisely controlling the depth and range of the fracture; and utilizes proven fast-drying expansive cement sealing technology to ensure a stable blasting environment. These three features systematically improve the precision of underwater rock blasting. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1The figure is a simplified diagram of the construction process of the underwater rock blasting method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0044] like Figure 1 As shown, an embodiment of the present invention provides a method for underwater rock blasting induced by carbon dioxide fracturing, comprising the following construction steps:

[0045] Step 1: Prepare for drilling. This step includes:

[0046] Step 11: Drilling Vessel Anchoring and Positioning. The floating drilling vessel deploys its anchor system. As shown in the figure, this vessel is equipped with six winching systems and employs a six-cable positioning method. The anchor cables are 200-250 meters long. A center cable and anchor are deployed at the bow and stern of the vessel, and two side cables and anchors are deployed on each side. The bow and stern of the vessel are preferably aligned parallel to the current. Deployment, positioning, and relocation of the vessel are all performed by deploying anchors and winching cables. The drilling vessel's anchor position should not interfere with the grab vessel's anchoring, rock drilling, and reef clearing operations, or should minimize cross-interference.

[0047] Step 12: Drilling Rig Installation. The drilling platform is preferably placed on the side of the drilling vessel. The drilling rig is mounted on the drilling vessel using a fixed or sliding mechanism along guide rails. The drilling vessel is relocated after each row of holes is drilled.

[0048] Step 13: Precise positioning of the drilling vessel. Each drilling vessel uses a secondary positioning system for precise positioning and water level measurement. In this embodiment, the secondary positioning system is preferably an RTK positioning system, i.e., a real-time dynamic differential positioning system, with an accuracy index of ±(2cm+1ppm). Before construction, a base station should be set up in an open location on the shore. The base station should be located on the top floor of a high-rise shore-based building close to the construction area, and personnel should be assigned to perform daily maintenance to avoid work stoppages due to base station signal reception failures during construction.

[0049] Step 14: Precise positioning of the drilling rig hole position. The designed hole position is pre-drawn into the GPS measurement software according to the hole spacing and row spacing designed for liquid carbon dioxide phase change rock breaking. The first positioning system feeds back the plane position of the drilling rig hole position on the drilling vessel to the monitoring system in real time and displays it on the computer screen to prevent missed drilling and overlapping drilling. In this embodiment, the first positioning system is preferably the DGPS positioning system. During on-site positioning, the measured hole position is compared with the designed hole position by releasing and winding the anchor cable, and the plane deviation is controlled within the specified range. In this embodiment, the plane deviation is controlled within 0.1m. When ignited, the construction vessel moves toward the outside of the channel.

[0050] Step 15: Determine drilling parameters. Using the local theoretical elevation system, the provided data will be input into the positioning software to automatically read the current water level in order to control the depth of the drilling.

[0051] The formula for calculating drilling depth is: Drilling depth = water level (tidal level calculated from the theoretical datum) - designed foundation pit bottom elevation - water depth + excess depth. During the drilling process, the bottom elevation of all holes must be kept roughly consistent. The deviation between the bottom elevation of all holes and the designed bottom elevation must be within 5 cm.

[0052] Step 2: Drill a cracking hole at the blasting location. This step includes:

[0053] Step 21: Drilling the fracturing hole. According to the design data, the "one-tube, one-drill" method is used with a high drill rig to overcome the influence of tidal currents on the borehole. Before drilling, casing is lowered, and then the drill string is lowered along the casing to the bottom for drilling. During the drilling process, the drill pipe is lifted while air and water are blown to discharge debris from the borehole. After drilling to the designed depth, the drill pipe is repeatedly raised and lowered to prevent clogging by gravel or silt. After the hole is completed, the fracturing pipe and obstruction are immediately lowered. Drilling and lowering the fracturing pipe are repeated. The outer casing of the drill pipe should be inserted 5 cm into the rock to facilitate drilling positioning and reduce the deviation of the borehole inclination.

[0054] Drilling is performed using a fully hydraulic down-the-hole drill, with the drill bit rotating and impacting the casing. Before construction, a water gauge should be established at a fixed location within the construction area where wind and waves are low, navigation is not disturbed, and construction is not affected. During drilling, drilling parameters should be adjusted promptly based on tidal fluctuations. The drill tool model on the on-site drilling vessel should be matched to the diameter of the fracture-causing pipe.

[0055] Step 22: Inspect and Accept the Fracturing Hole. After drilling the fracturing hole, an inspection is required, primarily to check the bottom elevation. The difference between the bottom elevation of the fracturing hole and the bottom elevation of the designed borehole must not exceed a specified range. Preferably, the elevation difference should not exceed 5 cm. Holes that do not reach the designed bottom elevation must be re-drilled to the designed elevation. Excessively deep holes must be backfilled to the designed elevation with quick-drying expansive cement.

[0056] Step 3: Prepare the fracturing pipe for blasting. In this embodiment, the fracturing pipe is a PVC pipe. In another embodiment, the fracturing pipe can also be a steel pipe. This step includes:

[0057] Step 31: Connect the detonator leg wires.

[0058] Connect the designed length of the detonator leg wire to the excitation tube extending outside the fracturing tube and measure the resistance of the fracturing tube to ensure that it is consistent with the designed value and stable. If the resistance differs significantly from the designed value (more than 10%), the cause should be promptly investigated and properly resolved.

[0059] The connection between the detonator leg wire and the excitation tube should be wrapped with insulating tape to prevent leakage. Double-layer insulated copper wire with high tensile strength must be used for the detonator leg wire. The length of the detonator leg wire is calculated using the following formula: Detonator leg wire length ≥ Water level elevation (tidal level calculated from the theoretical datum) - Design elevation of the foundation pit bottom + Excess depth - Length of the fracture-inducing tube + Height of the construction vessel + Planned vessel movement distance + 2m.

[0060] Step 32: Filling the fracturing tube with liquid carbon dioxide. This step specifically includes:

[0061] Step 321: Connect the equipment. Connect the intelligent carbon dioxide filling machine (hereinafter referred to as the "filler") to the storage tank containing liquid carbon dioxide and secure it securely. Connect the filling port of the filler to the filling valve on the fracturing tube via a length of filling hose and secure it securely. In this embodiment, the storage tank is a Dewar tank.

[0062] Step 322: Prepare for filling. Check the Dewar tank pressure gauge to ensure that the pressure is not less than 1MPa. Set the target filling pressure of the filling machine to 8MPa. Open the filling machine's exhaust valve and the Dewar tank's liquid outlet valve to exhaust the gas in the pipeline until liquid carbon dioxide flows out steadily. Then close the filling machine's exhaust valve. In addition, the filling machine should be started and the rotation direction of its drive components (such as pulleys) should be checked to ensure that they are consistent with the equipment markings.

[0063] Step 323: Fill with liquid carbon dioxide. Slowly open the filling valve of the filling machine to begin filling. When the target filling pressure is reached, the filling machine automatically shuts down and the filling valve is immediately closed. Open the exhaust valve to release the pressure. After confirming that the pressure has dropped to ambient pressure, disconnect the Dewar tank, the filling machine, and the fracturing tube. Repeat the above steps to fill the next fracturing tube.

[0064] It should be understood that the construction order of step 3, step 1 and step 2 is not specific and they can be carried out simultaneously.

[0065] Step 4: Lower the fracture tube.

[0066] Use a thin rope to tie a slipknot at the eye on the top of the carbon dioxide-filled fracturing tube. After the drill pipe is lifted from the drilling vessel, place the fracturing tube into the casing and lower it to the bottom of the borehole. Once the fracturing tube is at the bottom of the hole, shake the slipknot loose and remove the thin rope.

[0067] During the lowering of the fracturing tube, ensure that the detonator leg wire always extends beyond the casing. Secure the detonator leg wire to the vessel to prevent the end of the detonator leg wire from falling into the casing and preventing network connectivity. When lowering the fracturing tube, be careful to lower it slowly and gently, and avoid forcing the tube into the hole.

[0068] Step 5: Filling the rupture hole. This step includes:

[0069] Step 51: Mix the quick-drying expansive cement. Add an appropriate amount of accelerator and expansive agent to the cement slurry and stir to obtain the quick-drying expansive cement for sealing the holes. The quick-drying expansive cement should be mixed immediately before use and stirred evenly to achieve a fluid, plastic state to prevent large clumps from forming after mixing.

[0070] Step 52: Fill the crack hole in layers. Place the mixed quick-drying expansive cement into 120mm diameter plastic film sealable bags and form them into cement strips approximately 30cm long. Place the strips through the casing into the crack hole, as close to the center as possible. Use the tamping rod provided with the casing to tamp each strip vertically to ensure a dense filling. Be careful to protect the detonator leg wire. Repeat this process until the hole is filled to the opening.

[0071] Calculate the volume of cement slurry required to fill the crack hole based on its depth and diameter, and stop placing cement strips when the volume of cement strips reaches 110% of the calculated volume.

[0072] Step 53: Remove the casing. After packing is complete, wait at least 5 minutes before lifting the casing. Lift slowly and evenly to prevent damage to the detonator legs. When the casing is almost fully removed, secure the detonator legs to the vessel to prevent them from falling into the sea.

[0073] Step 6: Lay the rock-breaking network. This step includes:

[0074] Step 61: Connect the detonator legs of the fracturing tubes to form a rock-breaking network. Before connection, use an ohmmeter to test the resistance of the fracturing tubes. If the test result deviates significantly from the designed value, identify the cause and resolve the issue to ensure that each fracturing tube network is unobstructed and has a normal resistance.

[0075] After grouping and connecting the detonator legs of each cracking tube in parallel, connect them to the ignition busbar. All joints are wrapped with insulating tape and sealed with heat-shrinkable waterproof tubing to prevent leakage and short circuits caused by weather, seawater, and other factors. Slipknots are tied at the joints to prevent damage from seawater fluctuations. Before each connection to the network, the ignition busbar and the network must be inspected to ensure that the ignition busbar is free of rust and that the insulation is free of scratches and cracks.

[0076] After the rock breaking network is connected, use the ohmmeter to test the resistance of the entire rock breaking network again. If the test result deviates significantly from the design result, the cause should be identified and resolved in a timely manner to ensure that the rock breaking network is unobstructed and the resistance value is normal.

[0077] Step 62: Route the ignition busbar to the ignition station. Route the ignition busbar to the ignition station outside the security zone. The rock-breaking network must be laid away from on-site electrical boxes. The ignition station is ideally located within a shelter to ensure the safety of ignition workers. After confirming that the rock-breaking network remains unobstructed and its resistance is normal, twist the ends of the ignition busbar to form a short circuit and wrap the joints with insulating tape to protect the rock-breaking network from external static electricity.

[0078] Step 7: Safety preparation before detonation. This step includes:

[0079] Step 71: Move the construction vessels to safe waters. Move each construction vessel to safe waters to prevent damage to the vessel's hull from rock breaking. When moving the vessel, do not follow the current downstream of the rock breaking area. In turbulent waters, avoid moving perpendicular to the current. Both of these methods of movement may cause the detonator leg wire to be excessively stretched or even broken by the impact of the current.

[0080] Step 72: Establish a safety alert. The safety alert area is: vessels operating in open waters at a distance of 5,250 meters or more, and passenger ships, personnel working in the water, swimming, or diving at a distance of 1,750 meters or more. This step includes the following measures:

[0081] Step 721: Notify surrounding units and passing vessels. Before ignition and rock breaking, notify surrounding units and passing vessels, and send a liquid carbon dioxide phase change rock breaking notice, outlining relevant rock breaking details. Specifically, report to the Maritime Safety Administration's Traffic Control Center for the construction area one hour before ignition and rock breaking, and if necessary, request coordination with the Traffic Control Center regarding any passing vessels during this period.

[0082] Step 722: Set up warning signs and conduct marine life expulsion. If rock-breaking operations are underway that day, hoist a red flag on the construction vessel. When the alert begins, sound the alarm, and all security personnel and vessels take their positions. Notify the specialized white dolphin and lancelet expulsion teams to begin white dolphin expulsion operations 30 minutes in advance.

[0083] Step 723: Multiple command confirmations are performed before ignition. Once the commander has received notification that all security points have completed security, he or she may instruct the ignition personnel to connect the ignition busbar to the air-energy trigger and issue the charging and ignition command. Upon receiving the command, the ignition personnel should first sound three long whistles to initiate charging, followed by three short whistles to initiate ignition.

[0084] Step 8: Ignition.

[0085] The ignition operator checked the resistance of the rock breaking network again at the ignition station, and after confirming that the rock breaking network was in good condition and the resistance value was normal, he reported to the on-site commander.

[0086] After receiving the "charging ignition" signal from the on-site commander, the ignition operator connects the rock-breaking busbar to the air energy trigger and charges it immediately. After charging is completed, he reports "charging completed" to the on-site person in charge. After the on-site person in charge verbally gives the "ignition" command, the ignition operator presses the ignition button to complete the ignition and stimulate rock breaking.

[0087] Step 9: Release the alert after security check

[0088] More than 15 minutes after the rock breaking is completed, the technician will guide the underwater robot or underwater camera to check the rock breaking surface. If the fracture pipe is not activated or other safety hazards are found, they will be reported in time and handled by the technical person in charge.

[0089] After checking and confirming that there are no safety hazards, the alert is lifted and the next cycle of operation is entered.

[0090] In summary, the method provided in the embodiment of the present invention uses carbon dioxide pre-cracking technology to blast underwater rock masses, which has the following technical advantages compared to traditional methods: (1) Obvious ecological and environmental advantages. No explosive-derived toxic substances are produced during the entire process, thus avoiding marine chemical pollution. There is no high-temperature open flame in the blasting, and the inert characteristics of carbon dioxide cause little disturbance to sensitive areas such as coral reefs and fish habitats. The underwater noise is significantly lower than that of traditional blasting, meeting the IM0 standard and protecting sonar-sensitive creatures such as whales. (2) The safety risk is greatly reduced. Relying on the gasification and expansion of liquid carbon dioxide rather than chemical explosion eliminates the risk of accidental explosion. The vibration peak velocity is only 1 / 5 to 1 / 10 of that of traditional explosives, reducing the probability of damage to submarine pipelines and rock structures. (3) It has wide engineering applicability. The fully sealed design adapts to high-pressure environments at depths of more than 100 meters, overcoming the problem of water pressure failure of traditional explosives. By regulating the carbon dioxide filling amount and release pressure, the crushing depth and range can be finely controlled, making it suitable for excavation in narrow deep-sea areas. (4) Optimizing the overall construction benefits. The transportation, storage and supervision costs of explosives are saved, and carbon dioxide is easily available as an industrial by-product. Precise crushing control improves construction quality, eliminates the need for explosives permits, simplifies approval processes, and shortens preparation cycles.

[0091] Furthermore, compared to existing attempts at underwater rock blasting using carbon dioxide fracturing, the method provided in this embodiment offers the following technical improvements: It utilizes a sophisticated positioning system to achieve centimeter-level precision positioning of the drilling vessel and drilling rig; sets the target filling pressure of the filling machine based on the designed depth of the fracturing hole, precisely controlling the depth and range of the fracture; and utilizes proven fast-drying expansive cement sealing technology to ensure a stable blasting environment. These three features systematically improve the accuracy of underwater rock blasting.

[0092] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any technical equivalent transformation made using the contents of the present invention specification shall fall within the protection scope of the present invention.

Claims

1. A method for underwater rock blasting using carbon dioxide fracturing, characterized by: The following steps are involved: Step 1: Accurately locate the drilling vessel or drilling rig hole position based on the positioning system; Step 2: Drill a fracture hole in the rock mass using casing as a guide; Step 3: Configure the fracture tube; This step includes: Step 31: Connect the detonator leg wire of the fracturing tube; Step 32: Filling the fracturing tube with liquid carbon dioxide; controlling the fracturing range of the fracturing tube by setting a target filling pressure; Step 4: Lower the filled fracturing tube to the bottom of the fracturing hole; keep the detonator leg line extending outside the casing; Step 5: Fill the crack hole with sealing material and tamp it down; Step 6: Lay the rock-breaking network; this step includes: Step 61: Connect the detonator pins of each fracturing tube and then connect them to the ignition busbar; Step 62: Lead the ignition busbar to the safety ignition station, and perform waterproof insulation treatment on the end of the ignition busbar; Step 7: After evacuating personnel and equipment to a safe area and setting up safety alerts, ignite and detonate; Step 8: After breaking the rock and confirming safety through underwater testing, the alert is lifted; Among them, the construction order of step 3, step 1 and step 2 is not specific.

2. The method for underwater rock blasting using carbon dioxide fracturing according to claim 1, characterized in that: In step 1, the precise positioning method of the drilling rig hole position is as follows: the designed hole position of the crack-causing hole is drawn into the GPS measurement software; the drilling rig hole position on the drilling vessel is fed back to the monitoring system in real time through the first positioning system to be compared with the designed hole position in the GPS measurement software.

3. The method for underwater rock blasting using carbon dioxide fracturing according to claim 1, characterized in that: In step 32, the filling step of liquid carbon dioxide includes: Step 321: Connect the filling machine to the fracturing pipe and the storage tank filled with liquid carbon dioxide respectively; Step 322: This step includes: setting the target refilling pressure of the filling machine; venting the filling pipeline; Step 323: Open the filling machine to fill the fracture tube with carbon dioxide.

4. The method for underwater rock blasting using carbon dioxide fracturing according to claim 1, characterized in that: In step 5, the plugging material is quick-drying expansive cement.

5. A carbon dioxide-induced underwater rock blasting method according to any one of claims 1 or 4, characterized in that: Step 5: Specific construction steps include: Step 51: adding an accelerating agent and an expanding agent to the cement slurry and stirring to obtain a quick-drying expanding cement; Step 52: Divide the quick-drying expansive cement into a plurality of cement strips; place the cement strips into the casing and simultaneously compact them until they are filled to the opening of the crack hole; Step 53: Remove the cannula from the tear hole.

6. The method for underwater rock blasting using carbon dioxide fracturing according to claim 1, characterized in that: Step 2 also includes: after drilling the fracture-inducing hole, inspecting and accepting the fracture-inducing hole; the inspection and acceptance includes: ensuring that the elevation difference between the bottom of the fracture-inducing hole and the bottom of the designed drilled hole does not exceed a specified range.

7. The method for underwater rock blasting using carbon dioxide fracturing according to claim 1, characterized in that: In step 61, the detonator legs of the fracturing tubes are grouped and connected in parallel, and then connected to the ignition bus.

8. The method for underwater rock blasting using carbon dioxide fracturing according to claim 2, characterized in that: In the precise positioning of the drilling rig hole position in step 1, the plane deviation between the actual position of the drilling rig hole position and the designed hole position is controlled within 0.1 meters.

9. The method for underwater rock blasting using carbon dioxide fracturing according to claim 1, characterized in that: The fracturing pipe is a PVC pipe.

10. The method for underwater rock blasting using carbon dioxide fracturing according to claim 1, characterized in that: In step 8, the safety alert includes one or more of the following measures: notifying surrounding units and passing ships; setting up alarm signs; expelling marine life; and performing multiple command confirmations before ignition operations.

Images