Construction methods for reinforcing locally unfavorable geological conditions through borehole drilling based on blasting.

Abstract

This invention discloses a construction method for localized reinforcement of unfavorable geological conditions in boreholes based on blasting, comprising the following steps: installing an explosive charge adjacent to the upper part of the unfavorable geological area within the borehole; detonating the explosive charge, causing the surrounding rock near the explosive charge to break and fall, forming a local blockage in the lower part of the unfavorable geological area within the borehole; injecting sealing material into the borehole to form a seal in the unfavorable geological area; and removing the drilling tools to clear the blockage within the borehole. This invention can achieve localized positioning and sealing reinforcement without requiring full borehole sealing, simplifying the sealing workload, shortening the construction period, and saving materials.

Description

Technical Field

[0001] This invention belongs to the technical field of geological exploration, and is a construction method for reinforcing locally unfavorable geological conditions through blasting boreholes. Background Technology

[0002] Engineering geological exploration is generally conducted based on engineering geological mapping. It can directly penetrate underground rock strata to obtain the necessary engineering geological data, making it a reliable method for exploring deep geological conditions. The main tasks of engineering geological exploration include: determining the lithology and geological structure of the construction site, determining hydrogeological conditions, and extracting rock, soil, and water samples. Engineering geological drilling is an important method for obtaining accurate geological data below the surface, and its tasks also include collecting undisturbed rock and soil samples and conducting on-site mechanical tests through the boreholes. When conducting on-site mechanical tests, it is usually necessary to place testing equipment, such as geostress testing equipment and acoustic testing equipment, inside the borehole. The presence of unfavorable geological conditions often hinders on-site tests; therefore, to ensure the smooth progress of the tests, it is often necessary to reinforce the borehole wall. The traditional method of borehole wall reinforcement involves sealing the entire borehole and then re-sweeping it. This method alters the entire borehole wall structure, affecting the results of tests such as geostress, high-pressure water pressure, and geophysical exploration. Furthermore, it treats many areas that do not require treatment, delaying the project and wasting materials. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a construction method for localized reinforcement of unfavorable geological conditions in boreholes based on blasting. This method can perform localized sealing of unfavorable geological areas without requiring full borehole sealing, thus simplifying the sealing workload, shortening the construction period, and saving materials.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A construction method for reinforcing locally unfavorable geological conditions through borehole drilling based on blasting includes the following steps:

[0006] Install explosive charges on the upper part of the unfavorable geological area inside the borehole;

[0007] The explosive charge was detonated, and the surrounding rock near the charge was blasted apart and fell, forming a local blockage in the lower part of the unfavorable geological area inside the borehole.

[0008] The sealing material is injected into the borehole, filling the local blockage and the unfavorable geological area above it. After the sealing material solidifies, it forms a seal in the unfavorable geological area.

[0009] Remove the drilling tools and clear any blockages from the borehole.

[0010] Furthermore, the explosive charge was installed 30-50cm above the upper boundary of the unfavorable geological area.

[0011] Furthermore, the charge Q of the explosive charge is calculated using the volume V of the broken rock mass, with the formula Q = qV, where q is the unit consumption of explosive.

[0012] Furthermore, the volume V of the fractured rock mass is inversely related to the explosive consumption q.

[0013] Furthermore, when the volume V of the fractured rock mass is in the range of 0.5 to 5 m3, the explosive consumption q ranges from 1.0 to 2.0. When the volume V of the fractured rock mass is outside the range of 0.5 to 5 m3, the explosive consumption q is extended according to the law that q decreases as V increases.

[0014] Furthermore, the volume V of the fractured rock mass is calculated as V = 2Lπr 2 Where L is the distance between the explosive charge and the upper boundary of the unfavorable geological area, and r is the radius of the rock mass.

[0015] Furthermore, the value of r is less than the maximum depth of the adverse geological area relative to the borehole wall and greater than 3 times the diameter of the borehole. Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention uses blasting to first break the surrounding rock above the adverse geological area in the borehole for local adverse geological conditions. The broken rock blocks fall into the borehole to initially form a blockage. Then, sealing material is injected into the borehole to form a seal in the adverse geological area to reinforce the borehole. This method can achieve localized sealing and reinforcement without sealing the entire borehole, simplifying the sealing workload, shortening the construction period, and saving materials. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the inside of the drilled hole after the explosive charge is installed, according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the inside of the drill hole after the explosive charge is detonated, according to an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the inside of the borehole after the sealing is completed in an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the inside of the borehole after it has been re-drilled according to an embodiment of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0022] The present invention will be further described below with reference to specific embodiments, but these are not intended to limit the scope of the invention.

[0023] This invention discloses a construction method for reinforcing locally unfavorable geological conditions in boreholes based on blasting, comprising the following steps:

[0024] Step 1, as follows Figure 1 As shown, an explosive charge 3 is installed in the upper part of the borehole 1, adjacent to the unfavorable geological area 2. The explosive charge 3 is installed 30-50cm above the upper boundary line of the unfavorable geological area 2. In this embodiment, the explosive charge 3 is installed 30cm above the upper boundary line of the unfavorable geological area 2.

[0025] The charge Q of explosive charge 3 is determined based on the volume V of the rock mass to be broken. The formula for calculating the charge Q of explosive charge 3 is as follows:

[0026] Q = qV;

[0027] In the formula, q represents the unit consumption of explosive;

[0028] The volume V of the fractured rock mass is negatively correlated with the explosive consumption q; that is, the larger V is, the smaller q is. When the volume V of the fractured rock mass is between 0.5 and 5 m³, the correlation is as follows: 3 Within this range, the explosive consumption q ranges from 1.0 to 2.0; when the volume V of the fractured rock mass is between 0.5 and 5 m³... 3 When outside the range, the range of explosive consumption q is extended according to the law that q decreases as V increases.

[0029] The formula for calculating the volume V of the fractured rock mass is:

[0030] V=2Lπr 2 ;

[0031] Where L is the distance between the upper boundary of the explosive pack 3 and the unfavorable geological area 2, and r is the radius of the rock mass, which is less than the maximum depth of the unfavorable geological area 2 relative to the borehole wall and greater than 3 times the borehole diameter.

[0032] In this embodiment, the borehole diameter is 75mm, r is 400mm, and the explosive charge is 0.3kg.

[0033] Step 2: Detonate explosive charge 3, see Figure 2 After the surrounding rock near the explosive charge 3 was blasted and fell, it formed a local blockage 4 in the lower part of the unfavorable geological area in borehole 1;

[0034] Step 3: Inject sealing material into borehole 1. The sealing material fills the unfavorable geological area at and above the local blockage 4. After the sealing material solidifies, it forms a seal 5 in the unfavorable geological area. (See...) Figure 3 ;

[0035] Step 4: Place the drill string under the drill rod and drill through the drill string at the plugged area inside borehole 1 to clear the borehole. (See...) Figure 4 .

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the content of this specification should be included within the protection scope of the present invention.

Claims

1. A construction method for reinforcing locally unfavorable geological conditions through borehole drilling based on blasting, characterized in that, Includes the following steps: Install explosive charges on the upper part of the unfavorable geological area inside the borehole; The explosive charge was detonated, and the surrounding rock near the charge was blasted apart and fell, forming a local blockage in the lower part of the unfavorable geological area inside the borehole. The sealing material is injected into the borehole, filling the local blockage and the unfavorable geological area above it. After the sealing material solidifies, it forms a seal in the unfavorable geological area. Remove the drill string and clear any blockages from the borehole. The explosive charge was installed 30-50cm above the upper boundary of the unfavorable geological area. The charge Q of the explosive charge is calculated using the volume V of the broken rock mass, with the formula Q=qV, where q is the charge consumption per unit of explosive.

2. The construction method for localized reinforcement of unfavorable geological conditions in boreholes based on blasting according to claim 1, characterized in that, The volume V of the fractured rock mass is negatively correlated with the explosive consumption q.

3. The construction method for localized reinforcement of unfavorable geological conditions in boreholes based on blasting according to claim 1, characterized in that, The volume V of the fractured rock mass is between 0.5 and 5 m. 3 Within this range, the explosive consumption q ranges from 1.0 to 2.0, and the volume V of the fractured rock mass is between 0.5 and 5 m³. 3 When outside the range, the range of explosive consumption q is extended according to the law that q decreases as V increases.

4. The construction method for localized reinforcement of unfavorable geological conditions in boreholes based on blasting according to claim 1, characterized in that, The volume V of the fractured rock mass is calculated as V = 2Lπr 2 Where L is the distance between the explosive charge and the upper boundary of the unfavorable geological area, and r is the radius of the rock mass.

5. The construction method for localized reinforcement of unfavorable geological conditions in boreholes based on blasting according to claim 4, characterized in that, The value of r is less than the maximum depth of the unfavorable geological area relative to the borehole wall and greater than 3 times the diameter of the borehole.

Images