A construction method for treating slurry leakage during drilling with an impact drill

Abstract

The present invention provides a construction method for treating slurry leakage in percussion drilling. In this method, when slurry leakage occurs in a casing during percussion drilling, backfill material is added to the casing and the backfill material is subjected to backfill impact, so that the backfill material forms a mixed slurry under the impact of the percussion drill. The mixed slurry can fill the leakage location. In this way, after the backfill impact is completed, the mixed slurry is allowed to stand to fill the leakage gap and consolidate with the stratum, thereby promptly sealing the leakage. The consolidated mixed slurry can form a protective wall on the inner wall of the hole, ensuring the structural stability of the hole. After the mixed slurry is consolidated, the drilling impact operation can be continued to complete the drilling of the stratum. During this process, the protective wall formed by the mixed slurry can prevent the hole wall from collapsing, further ensuring the stability of the percussion drilling operation, and ensuring the progress and quality of the drilling operation.

Description

Technical Field

[0001] The invention relates to the technical field of pile foundation construction, in particular to a construction method for handling slurry leakage during drilling with an impact drill. Background Art

[0002] During the construction of bridges in deep waters such as rivers, in order to ensure the stability of the bridge construction, impact drills are generally used for drilling operations and pouring to form deep-water pile foundations.

[0003] When percussion drilling is carried out under some complex geological conditions, such as permeable pebble layers or sand and gravel bottom layers, leakage is prone to occur, which will have an adverse effect on the progress and quality of the drilling operation. Severe leakage can easily lead to hole wall collapse and drill bit drop.

[0004] Therefore, when performing impact drilling operations, it is necessary to promptly plug the leaking locations to prevent the leakage from causing a significant negative impact on the safety and efficiency of deep-water pile foundation construction. Summary of the Invention

[0005] The problem solved by the invention is how to promptly stop leakage of slurry that occurs during the percussion drilling operation.

[0006] In order to solve the above problems, the present invention provides a construction method for treating slurry leakage in percussion drilling, comprising:

[0007] burying a casing and performing percussion drilling operations in the casing;

[0008] Determining whether the slurry in the casing is leaking;

[0009] If so, filling backfill material into the casing to a first preset position above the bottom of the casing;

[0010] Performing backfill impact on the backfill material to form a mixed slurry, and adjusting parameters of the mixed slurry to a first preset value;

[0011] After the backfill impact is completed, the mixed mud is left to stand for a first preset time until solidification occurs, and then the impact drilling operation is continued.

[0012] Compared with the prior art, the beneficial effects of the present invention include: during the impact drilling operation, when there is leakage of mud in the casing, backfill material is filled into the casing and the backfill material is backfilled and impacted, so that the backfill material forms a mixed mud under the impact of the impact drill, and the mixed mud can fill the leakage position. In this way, after the backfill impact is completed, the mixed mud is left to stand so that it can fill the leakage gap and consolidate with the formation, so as to timely seal the leakage, and the consolidated mixed mud can form a protective wall on the inner wall of the hole to ensure the structural stability of the hole. After the mixed mud is consolidated, the drilling impact operation can be continued to complete the drilling of the formation. In this process, the protective wall formed by the mixed mud can avoid the collapse of the hole wall, further ensuring the stability of the impact drilling operation, and ensuring the progress and quality of the drilling operation.

[0013] Optionally, the backfill material includes a plugging backfill material and a supporting backfill material. When the slurry in the casing leaks, the percussion drill drilling leakage treatment construction method further includes:

[0014] Obtaining the bottom elevation of the casing and the depth of the impact drilling operation;

[0015] When the depth of the impact drilling operation is greater than the bottom elevation of the casing, obtaining the slurry leakage position;

[0016] When the distance between the slurry leakage position and the bottom of the casing is less than or equal to a second preset value, the supporting backfill material is filled into the casing to a second preset position below the bottom of the casing, wherein the second preset value is less than or equal to the distance between the second preset position and the bottom of the casing;

[0017] After the supporting backfill material is backfilled, the leak-proof backfill material is filled into the casing to the first preset position above the bottom opening of the casing.

[0018] Optionally, the percussion drill drilling slurry leakage treatment construction method further includes:

[0019] When the distance between the leakage position and the bottom elevation of the casing is greater than the second preset value, or when the depth of the impact drilling operation is equal to the bottom elevation of the casing, the plugging backfill material is filled into the casing to the first preset position above the bottom of the casing.

[0020] Optionally, the second preset value is 0.5m, the distance between the first preset position and the bottom of the casing is 2-3m, and the distance between the second preset position and the bottom of the casing is 0.5-1m.

[0021] Optionally, the plugging backfill material includes at least one of cement, woven bags and clay, the woven bags are filled with stones and straw, and the supporting backfill material includes stone flakes.

[0022] Optionally, when the plugging backfill material includes the cement and the clay, the volume ratio of the cement to the clay is greater than or equal to 1:5;

[0023] When the plugging backfill material includes the woven bag and the clay, the volume ratio of the woven bag to the clay is 1:1;

[0024] The volume ratio of the stones to the straw in the woven bag is 1:2, the diameter of the stones is 10 to 20 cm, and the straw is dry straw.

[0025] Optionally, the determining whether the slurry in the casing is leaking specifically includes:

[0026] Observe whether the liquid level of the mud drops;

[0027] If so, observe whether the liquid level of the mud drops to a third preset value within a second preset time, wherein the second preset time is 30 minutes and the third preset value is 1 to 3 meters;

[0028] If so, it is determined that the slurry in the casing is leaking.

[0029] Optionally, the parameters of the mixed mud include specific gravity and viscosity, the first preset value of the specific gravity is 1.3-1.5, the first preset value of the viscosity is 25-30 Pa.s, and the stroke of the backfill impact is 0.5-1.5 m.

[0030] Optionally, when performing the backfill impact on the backfill material, the impact drill drilling slurry leakage treatment construction method further includes:

[0031] During the backfill impact, observing the liquid level of the slurry in the casing;

[0032] When the liquid level of the mud drops, the mud is replenished into the casing.

[0033] Optionally, the first preset time is 24 to 36 hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Flowchart of a construction method for handling slurry leakage from a percussion drill according to an embodiment of the present invention;

[0035] Figure 2 Schematic diagram of the impact operation of the impact drill in the construction of leak plugging in a hole according to one embodiment of the present invention;

[0036] Figure 3 Schematic diagram of drilling leakage during the construction of plugging leakage by impact drilling in one embodiment of the present invention;

[0037] Figure 4 Schematic diagram of backfilling and plugging during the construction of plugging slurry leakage in a percussion drill hole according to one embodiment of the present invention;

[0038] Figure 5 A schematic diagram of an impact operation for plugging a leaking hole with an impact drill according to another embodiment of the present invention;

[0039] Figure 6 A schematic diagram of a drilling leakage repair process using an impact drill according to another embodiment of the present invention;

[0040] Figure 7 A schematic diagram of backfilling and plugging during slurry plugging work for percussion drilling in another embodiment of the present invention;

[0041] Figure 8 A schematic diagram of a drilling leakage plugging operation using an impact drill according to another embodiment of the present invention;

[0042] Figure 9 This is a schematic diagram of backfilling and plugging during the construction of slurry plugging for percussion drilling in another embodiment of the present invention.

[0043] Description of reference numerals:

[0044] 1- casing; 2- backfill material; 21- plugging backfill material; 22- supporting backfill material; 3- gravel layer; 4- highly weathered stratum; 5- water level; 6- mud level; 7- leakage location; 8- hole. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0046] It should be noted that in the coordinate system XY provided herein, the positive direction of the X axis represents the right direction, the negative direction of the X axis represents the left direction, the positive direction of the Y axis represents the top direction, and the negative direction of the Y axis represents the bottom direction. It should also be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0047] In order to solve the above problems, an embodiment of the present invention provides a construction method for dealing with leakage in percussion drilling, including: burying a casing 1 and performing percussion drilling operations in the casing 1; judging whether the slurry in the casing 1 is leaking; if so, filling backfill material 2 into the casing 1 to a first preset position above the bottom of the casing 1; backfilling the backfill material 2 to form a mixed mud, and adjusting the parameters of the mixed mud to a first preset value; after the backfilling impact is completed, standing for a first preset time until the mixed mud solidifies, and continuing the percussion drilling operation.

[0048] In this embodiment, if Figure 1 S1 to S5 and Figures 2 to 9 As shown, during the deep-water pile foundation construction, a casing 1 is first buried on the riverbed to facilitate the impact drilling operation on the bottom layer of the riverbed in the casing 1. The impact drill is used to drill a stratum such as a pebble layer 3 to form a hole 8 in the casing 1. During the drilling process, as the impact drill gradually moves downward, when the drill bit of the impact drill exceeds the casing 1, the side wall of the borehole loses the protection of the casing 1. Due to the structure of the stratum and the vibration generated during the impact drilling, the mud skin wall formed by the borehole is easily damaged, and slurry leakage is likely to occur, especially in the pebble layer. Therefore, during the impact drilling operation, it is necessary to frequently check and judge the mud skin in the casing 1. Check whether there is leakage of slurry. When leakage occurs, stop drilling operation, fill backfill material 2 into casing 1, and fill the height of backfill material 2 to a first preset position above the bottom of casing 1, that is, part of backfill material 2 is located in casing 1, casing 1 can provide side support for backfill material 2, which is convenient for subsequent impact on backfill material 2. After the backfill material 2 is filled, backfill impact is performed on backfill material 2, so that the backfill material 2 forms mixed mud under the impact of the impact drill, and the parameters of the mixed mud are adjusted to the first preset value during the impact process, so that the mixed mud can fill the leakage position 7 and penetrate into the formation.

[0049] In this way, after the backfill impact is completed, the mixed mud is left to stand for a first preset time so that it can fill the leakage gaps and consolidate with the stratum, so as to timely seal the leakage, and the consolidated mixed mud can form a protective wall on the inner wall of the hole 8 to ensure the structural stability of the hole 8. After the mixed mud is solidified, the drilling impact operation can be continued to complete the drilling of the stratum. In this process, the protective wall formed by the mixed mud can prevent the hole 8 from collapsing, further ensuring the stability of the impact drilling operation, and ensuring the progress and quality of the drilling operation.

[0050] Optionally, the backfill material 2 includes a leak-proof backfill material 21 and a supporting backfill material 22. When there is leakage in the mud in the casing 1, the percussion drilling leakage treatment construction method also includes: obtaining the bottom elevation of the casing 1 and the depth of the percussion drilling operation; when the depth of the percussion drilling operation is greater than the bottom elevation of the casing 1, obtaining the leakage position 7 of the mud; when the distance between the leakage position 7 and the bottom of the casing 1 is less than or equal to a second preset value, filling the supporting backfill material 22 into the casing 1 to a second preset position below the bottom of the casing 1, wherein the second preset value is less than or equal to the distance between the second preset position and the bottom of the casing; after the backfilling of the supporting backfill material 22 is completed, filling the leak-proof backfill material 21 into the casing 1 to the first preset position above the bottom of the casing 1.

[0051] When the slurry in the casing 1 is leaking, the casing 1 is filled with backfill material 2. Sometimes the gap where the slurry leaks is deep in the formation. In order to ensure timely plugging of the leak and improve the convenience of plugging, in this embodiment, Figures 2 to 9 As shown, plugging backfill material 21 and supporting backfill material 22 are provided. When the location of leakage is shorter than the bottom of casing 1 and the depth of hole 8 is deeper, supporting backfill material 22 can be first filled into casing 1 to lift the bottom surface of hole 8 upward, and then plugging backfill material 21 is filled to seal the leakage gap. The source of supporting backfill material 22 is relatively wide, and there is no need to maintain a tight filling state. Gaps between materials are also acceptable. It is only necessary to maintain a certain supporting strength. It can be obtained in time at the construction site and the cost is low. Leakage plugging backfill material 21 needs to be purchased and prepared for use during impact operations, and the cost is relatively high.

[0052] In this embodiment, in order to facilitate the coordination of the plugging backfill material 21 and the supporting backfill material 22, when leakage occurs in the slurry in the casing 1, the leakage position 7 is judged. The approximate area of ​​the leakage position 7 is judged by the bottom elevation of the casing 1 and the depth of the impact operation. When the depth of the impact operation is less than the bottom elevation of the casing 1, due to the protective operation of the casing 1, no leakage will occur in the hole 8.

[0053] Therefore, if Figure 5 、 Figure 8 and Figure 9As shown, when there is leakage of slurry in the casing 1, the bottom elevation of the casing 1 and the depth of the impact drilling operation are obtained. When the depth of the impact drilling operation is greater than the bottom elevation of the casing 1, the leakage position 7 is obtained, and it is determined whether the distance between the leakage position 7 and the bottom of the casing 1 is less than or equal to a second preset value, that is, whether the leakage position 7 is closer to the bottom of the casing 1 than to the bottom of the hole 8. If it is less than or equal to the second preset value, the leakage position 7 is closer to the bottom of the casing 1. At this time, the supporting backfill material 22 is filled into the casing 1. When it is filled to the second preset position below the bottom of the casing 1, the plugging backfill material 21 is filled to the first preset position above the bottom of the casing 1. The distance between the second preset position and the bottom of the casing 1 is greater than the second preset value. Therefore, the top of the supporting backfill material 22 is lower than the leakage position 7, which not only supports the plugging backfill material 21, but also ensures that the plugging backfill material 21 can seal the leakage position 7.

[0054] It should be noted that, in this embodiment, Figure 8 and Figure 9 As shown, the grouting position 7 is located at the bottom of the casing 1. In other embodiments of the present invention, the grouting position 7 can be located at other positions, as long as the grouting position 7 is closer to the bottom of the casing 1 than to the bottom of the hole 8.

[0055] It should be noted that, in this embodiment, when obtaining the leakage position 7, it can be estimated based on the construction experience of the construction personnel, or it can be estimated based on the situation that occurs during impact drilling operations in other areas of the entire construction site, or it can be detected through geological detection equipment such as exploration radar.

[0056] Optionally, the impact drill drilling leakage treatment construction method also includes: when the distance between the leakage position 7 and the bottom elevation of the casing 1 is greater than a second preset value, or when the depth of the impact drilling operation is equal to the bottom elevation of the casing 1, filling the casing 1 with plugging backfill material 21 to the first preset position above the bottom of the casing 1.

[0057] When the leakage position 7 is close to the bottom of the casing 1 and far away from the bottom of the hole 8, it is necessary to use the supporting backfill material 22 and the plugging backfill material 21 to fill the casing 1. When the distance between the leakage position 7 and the bottom of the casing 1 is greater than or equal to the distance from the bottom of the hole 8, in order to ensure the plugging of the leakage position 7, it is necessary to only use the plugging backfill material 21 to fill the casing 1.

[0058] Therefore, if Figures 2 to 4As shown, when the depth of the impact drilling operation is equal to the bottom elevation of the casing 1, due to the protection of the casing 1 on the side wall of the hole 8, the leakage position 7 can only exist at the bottom of the casing 1. At this time, the leakage position 7 is relatively low, and the leakage at the leakage position 7 can be completed by simply filling the casing 1 with the plugging backfill material 21, performing backfill impact, and allowing the mixed slurry to solidify.

[0059] like Figures 5 to 7 As shown, when the depth of the impact drilling operation is greater than the bottom elevation of the casing 1, at this time, the leakage position 7 is obtained, and it is determined whether the distance between the leakage position 7 and the bottom of the casing 1 is greater than the second preset value, that is, whether the leakage position 7 is farther relative to the bottom of the casing 1 than the distance relative to the bottom of the hole 8. If it is greater than the second preset value, the leakage position 7 is farther away from the bottom of the casing 1. Since there is a gap between the supporting backfill material 22, at this time, it is the same as the situation when the depth of the impact drilling operation is equal to the bottom elevation of the casing 1. It is only necessary to directly fill the plugging backfill material 21 to the first preset position above the bottom of the casing 1 to ensure that the plugging backfill material 21 can seal the leakage position 7.

[0060] It should be noted that, in this embodiment, Figure 6 and Figure 7 As shown, the grout leakage position 7 is located at the bottom side of the hole 8, that is, at the junction of the pebble layer 3 and the strongly weathered stratum 4. In other embodiments of the present invention, the grout leakage position 7 can also be located at other positions, as long as the grout leakage position 7 is farther from the bottom of the casing 1 than from the bottom of the hole 8.

[0061] Optionally, the second preset value is 0.5 m, the distance between the first preset position and the bottom of the casing 1 is 2 to 3 m, and the distance between the second preset position and the bottom of the casing 1 is 0.5 to 1 m.

[0062] In this embodiment, in order to ensure accurate sealing of the leakage position 7 and complete the plugging operation, the second preset value is set to 0.5m, and the distance between the second preset position and the bottom of the casing 1 is set to 0.5~1m, which not only satisfies the effective support of the supporting backfill material 22 on the plugging backfill material 21, and the plugging backfill material 21 blocks the plugging position, but also avoids the waste of the plugging backfill material 21.

[0063] In addition, the distance between the first preset position and the bottom of the casing 1 is set to 2 to 3 meters, which ensures the height of the plugging backfill material 21 in the casing 1, making it convenient to obtain sufficient mixed mud during backfill impact, and at the same time plays a buffering role to avoid the impact of backfill impact on the formation.

[0064] Optionally, the plugging backfill material 21 includes at least one of cement, woven bags and clay, the woven bags are filled with stones and straw, and the supporting backfill material 22 includes stone flakes.

[0065] In order to ensure that the plugging backfill material 21 effectively seals the leakage position 7, in this embodiment, the plugging backfill material 21 is set to at least one of cement, woven bags and clay, wherein the woven bags are filled with stones and straw. The cement has a high structural strength after solidification and can play a protective role on the stratum. The woven bags are filled with stones and straw. The stones can ensure the structural strength after fixation, and the straw can increase the tension and overall adhesion of the mixed mud after solidification, thereby improving the toughness of the mud protective wall. The clay has high plasticity and can form a protective wall with a dense skeleton structure. Of course, the cooperation between cement, clay and woven bags can further improve the structural strength, tension, overall adhesion, toughness and structural skeleton density of the mixed mud after solidification, effectively ensuring the stability of the mixed mud during the impact operation again after solidification, thereby avoiding secondary leakage.

[0066] In addition, the supporting backfill material 22 is set to stone slabs, which are materials that are easily obtained at the construction site and have a low cost. The stone slabs have a certain structural strength and can meet the requirements of effectively supporting the leak-proof backfill material 21.

[0067] Optionally, when the plugging backfill material 21 includes cement and clay, the volume ratio of cement to clay is greater than or equal to 1:5; when the plugging backfill material 21 includes woven bags and clay, the volume ratio of woven bags to clay is 1:1; wherein, the volume ratio of stones to straw in the woven bags is 1:2, the diameter of the stones is 10 to 20 cm, and the straw is dry straw.

[0068] In this embodiment, in order to ensure the performance of the plugging backfill material 21, when the plugging backfill material 21 includes cement and clay, the volume ratio of cement and clay is set to be greater than or equal to 1:5. In this way, the cement and clay can form a mortar, which can form a protective wall with a dense skeleton structure after the mixed mud is solidified, thereby improving the support for the formation and avoiding secondary leakage.

[0069] In addition, when the plugging backfill material 21 includes woven bags and clay, the volume ratio of the woven bags to the clay is set to 1:1, and the volume ratio of the stones to the straw in the woven bags is set to 1:2. The diameter of the stones is set to 10 to 20 cm, and the straw is set to dry straw. In this way, after the woven bags and clay are backfilled, the stones are interlocked with each other. After the mixed mud solidifies, the clay and straw can form a dense protective wall with high toughness, high tensile strength and overall bonding strength, thereby improving support for the formation and avoiding secondary leakage. The diameter of the stones is set to 10 to 20 cm. This is convenient for filling the woven bags and filling the woven bags into the casing 1 after backfilling, and it is also convenient for breaking the stones to form a mixed mud during backfilling. The use of dry straw can further improve the toughness of the mixed mud after solidification.

[0070] Optionally, determining whether the slurry in the casing 1 is leaking specifically includes: observing whether the liquid level of the mud drops; if so, observing whether the drop height of the liquid level of the mud is a third preset value within a second preset time, wherein the second preset time is 30 minutes and the third preset value is 1 to 3 meters; if so, determining that the slurry in the casing 1 is leaking.

[0071] In this embodiment, in order to accurately know whether the slurry in the casing 1 is leaking, Figures 2 to 9 As shown, it is necessary to first observe whether the mud level 6 drops, that is, the mud level 6 is generally located above the water level line 5. When the mud level 6 drops and gradually tends to be the same height as the water level line 5, it can be determined that the mud in the casing 1 is leaking.

[0072] Specifically, in this embodiment, the difference between the initial height of the mud liquid level 6 and the water level line 5 is a third preset value, generally 1 to 3 meters. If the mud liquid level 6 drops rapidly by 1 to 3 meters within the second preset time, that is, within 30 minutes, it can be determined that the mud in the casing 1 is leaking.

[0073] Optionally, the parameters of the mixed mud include specific gravity and viscosity, the first preset value of the specific gravity is 1.3-1.5, the first preset value of the viscosity is 25-30 Pa.s, and the stroke of the backfill impact is 0.5-1.5 m.

[0074] In this embodiment, the parameters of the mixed mud include specific gravity and viscosity. The specific gravity, i.e., the mud density, reaches a first preset value, ensuring that the mixed mud meets the required strength after consolidation. The viscosity reaches a first preset value, ensuring that the toughness of the mixed mud after consolidation meets the required impact resistance. Specifically, the first preset value of the specific gravity is set to 1.3-1.5, and the first preset value of the viscosity is set to 25-30 Pa.s.

[0075] In this embodiment, the stroke of the backfill impact is set to 0.5~1.5m. Under this stroke, the impact drill performs a small-stroke backfill impact, which not only meets the need to crush the backfill material 2, adjusts the parameters of the mixed mud to reach the first preset value, and forms a mixed mud that meets the requirements, but also avoids the adverse effects of the backfill impact on the stability of the casing 1 and the hole 8.

[0076] Optionally, the percussion drill drilling leakage plugging method further includes: observing the liquid level of the mud in the casing 1 during the backfill impact process; when the liquid level of the mud drops, replenishing the mud into the casing 1.

[0077] like Figures 2 to 9 As shown, in order to ensure that the mud level 6 can be higher than the water level 5 when the impact operation is continued after the mixed mud solidifies, it is convenient to judge whether secondary leakage occurs during the impact operation by obtaining the relative position of the mud level 6 and the water level 5. Therefore, in this embodiment, when the backfill impact is performed, when the mud level 6 in the casing 1 drops, the mud is replenished in the casing 1 in time to avoid excessive mud from being lost through the leakage position 7.

[0078] Optionally, the first preset time is 24 to 36 hours.

[0079] In this embodiment, in order to make the performance of the mixed mud after solidification meet the needs of the impact operation, after the mixed mud is formed, it is necessary to let it stand for a first preset time to facilitate the consolidation of the mixed mud. Of course, according to the needs of the impact operation, it is necessary to set a minimum standing time, that is, 24 hours. After 24 hours of standing, the solidified mixed mud can meet the needs of the impact operation. When the construction period is short, the efficiency of leak plugging can be improved. A maximum standing time is also set, that is, 36 hours. After 36 hours of standing, the solidified mixed mud can meet the needs of the impact operation, and the performance of the solidified mixed mud is better, and the stability during the impact operation is better, which can relatively improve the efficiency of the impact operation. When the construction period is long, the work quality and efficiency of the impact operation can be improved.

[0080] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A construction method for treating slurry leakage in percussion drilling, characterized in that: include: burying a casing (1), and performing percussion drilling operations in the casing (1); Determining whether the slurry in the casing (1) is leaking; If so, fill the backfill material (2) into the casing (1) to a first preset position above the bottom of the casing (1); Performing backfill impact on the backfill material (2) to form a mixed mud, and adjusting the parameters of the mixed mud to a first preset value; After the backfill impact is completed, the mixed mud is allowed to stand for a first preset time until solidification occurs, and the impact drilling operation is continued; The backfill material (2) includes a plugging backfill material (21) and a supporting backfill material (22). When the slurry in the casing (1) leaks, the percussion drill drilling leakage treatment construction method further includes: Obtaining the bottom elevation of the casing (1) and the depth of the impact drilling operation; When the depth of the impact drilling operation is greater than the bottom elevation of the casing (1), obtaining the slurry leakage position; When the distance between the leakage position and the bottom of the casing (1) is less than or equal to a second preset value, the supporting backfill material (22) is filled into the casing (1) to a second preset position below the bottom of the casing (1), wherein the second preset value is less than or equal to the distance between the second preset position and the bottom of the casing (1); After the supporting backfill material (22) is backfilled, the leak-proof backfill material (21) is filled into the casing (1) to the first preset position above the bottom of the casing (1).

2. The construction method for treating slurry leakage caused by impact drilling according to claim 1, characterized in that: Also includes: When the distance between the leakage position and the bottom elevation of the casing (1) is greater than the second preset value, or when the depth of the impact drilling operation is equal to the bottom elevation of the casing (1), the plugging backfill material (21) is filled into the casing (1) to the first preset position above the bottom of the casing (1).

3. The construction method for treating slurry leakage caused by impact drilling according to claim 1, characterized in that: The second preset value is 0.5m, the distance between the first preset position and the bottom of the casing (1) is 2-3m, and the distance between the second preset position and the bottom of the casing (1) is 0.5-1m.

4. The construction method for treating slurry leakage caused by impact drilling according to claim 1, characterized in that: The plugging backfill material (21) comprises at least one of cement, woven bags and clay, the woven bags are filled with stones and straw, and the supporting backfill material (22) comprises stone flakes.

5. The construction method for treating slurry leakage caused by impact drilling according to claim 4 is characterized in that: When the plugging backfill material (21) includes the cement and the clay, the volume ratio of the cement to the clay is greater than or equal to 1:5; When the leak-proof backfill material (21) includes the woven bag and the clay, the volume ratio of the woven bag to the clay is 1:1; The volume ratio of the stones to the straw in the woven bag is 1:2, the diameter of the stones is 10-20 cm, and the straw is dry straw.

6. The construction method for treating slurry leakage in percussion drilling according to any one of claims 1 to 5, characterized in that: The determining whether the slurry in the casing (1) is leaking specifically includes: Observe whether the liquid level of the mud drops; If so, observe whether the liquid level of the mud drops to a third preset value within a second preset time, wherein the second preset time is 30 minutes and the third preset value is 1-3 meters; If so, it is determined that the slurry in the casing (1) is leaking.

7. The construction method for treating slurry leakage caused by percussion drilling according to claim 1, characterized in that: The parameters of the mixed mud include specific gravity and viscosity. The first preset value of the specific gravity is 1.3-1.5, the first preset value of the viscosity is 25-30 Pa.s, and the stroke of the backfill impact is 0.5-1.5 m.

8. The construction method for treating slurry leakage caused by percussion drilling according to claim 1, characterized in that: When the backfill material (2) is subjected to the backfill impact, the impact drill drilling slurry leakage treatment construction method further includes: During the backfill impact process, observing the liquid level of the mud in the casing (1); When the liquid level of the mud drops, the mud is replenished into the casing (1).

9. The construction method for treating slurry leakage caused by percussion drilling according to claim 1, characterized in that: The first preset time is 24~36 hours.

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