METHOD FOR TREATING A HIGH AND STEEP LANDSLIDE IN A MINE WITH A GENTLY-INCLINED AND WEAK INTERLAYER

Abstract

The present disclosure provides a method for treating a high and steep landslide in a mine with a gently-inclined and weak interlayer. The method comprises the following steps as S1˜S4: S1. excavating small-benches on stable bedrock below a weak interlayer to form working surfaces for risk elimination process of landslide; S2. conducting the risk elimination process; S3. transporting a landslide accumulation body to a crushing station or a rock dump site; S4. repeating steps S1 to S3, and continuously advancing risk elimination along the working surfaces for the risk elimination process of landslide until treatment of the high and steep landslide in a mine with a gently-inclined and weak interlayer is completed. The method can treat the landslide from the root cause, avoiding a secondary landslide. The method does not affect structures and buildings in a mine, ensuring safety of personnel and excavator.

Claims

1. A method for treating a high and steep landslide in a mine with a gently-inclined and weak interlayer, comprising: S1. excavating small-benches on stable bedrock below a weak interlayer to form working surfaces for risk elimination process of landslide; S2. conducting the risk elimination process; S3. transporting a landslide accumulation body to a crushing station or a rock dump site; and S4. repeating steps S1 to S3, and continuously advancing risk elimination along the working surfaces for the risk elimination process of landslide until treatment of the high and steep landslide in a mine with a gently-inclined and weak interlayer is completed; wherein, the step S2 further comprises the following steps: laying out the small-benches perpendicular to a stratus strike of a high slope in a mine with a gently-inclined and weak interlayer, and advancing risk elimination along the stratus strike; keeping a horizontal distance between the working surfaces for the risk elimination process implemented on adjacent small-benches equal to or greater than 50 m, and conducting the risk elimination process on two or more small-benches at the same time; a landslide accumulation body collapsing along a free surface side by its own weight; and stable structure of a consolidated accumulation body being destroyed by vibrations of an excavator bucket, and then the consolidated accumulation body collapses by its own weight.

2. The method for treating a high and steep landslide in a mine with a gently-inclined and weak interlayer according to claim 1, wherein a slope gradient of the small-bench is 5‰-7‰.

3. The method for treating a high and steep landslide in a mine with a gently-inclined and weak interlayer according to claim 1, wherein a height difference between two adjacent small-benches is determined according to an operating range of excavator.

4. The method for treating a high and steep landslide in a mine with a gently-inclined and weak interlayer according to claim 1, wherein in the step S1, a crawler-type impact hammer is used to excavate the small-benches on the stable bedrock below the weak interlayer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG. 1 is a construction flow chart of a landslide treatment according to one or more embodiments of the present disclosure.

[0014] FIG. 2 is a schematic sectional view of the landslide treatment according to one or more embodiments of the present disclosure.

[0015] FIG. 3 is a schematic sectional view of small-benches according to one or more embodiments of the present disclosure.

[0016] FIG. 4 is a schematic plan view of the small-benches according to one or more embodiments of the present disclosure.

[0017] FIG. 5 is a schematic diagram showing an operating range of an excavator according to one or more embodiments of the present disclosure.

[0018] FIG. 6 is a schematic diagram showing cleaning and advancing of a landslide accumulation body according to one or more embodiments of the present disclosure.

[0019] FIG. 7 is a schematic diagram showing a technical solution of “a landslide accumulation body collapsing along a free surface side by its own weight; stable structure of a consolidated accumulation body being destroyed by vibrations of an excavator bucket, and then the consolidated accumulation body collapses by its own weight” according to one or more embodiments of the present disclosure.

REFERENCE NUMERALS IN THE FIGURES ARE LISTED AS BELOW

[0020] 1. High slope in a mine with a gently-inclined and weak interlayer; 2. small-bench; 3. excavator; 4. mine truck; 5. landslide accumulation body; 6. weak interlayer; 7. operating range; a. width of small-bench; α. slope inclination; h. height difference between two adjacent small-benches; A. natural angle of repose; L. horizontal distance between the working surfaces for the risk elimination process implemented on adjacent small-benches.

DETAILED DESCRIPTION OF THE INVENTION

[0021] The present disclosure will be further described below with reference to drawings and embodiments.

[0022] One or more embodiments of the present disclosure provide a method for treating a high and steep landslide in a mine with a gently-inclined and weak interlayer, comprising the following steps S1˜S4:

[0023] S1. excavating small-benches on stable bedrock below a weak interlayer to form working surfaces for risk elimination process of landslide;

[0024] S2. conducting the risk elimination process;

[0025] S3. transporting a landslide accumulation body to a crushing station or a rock dump site; and

[0026] S4. repeating steps S1 to S3, and continuously advancing risk elimination along the working surfaces for the risk elimination process of landslide until treatment of the high and steep landslide in a mine with a gently-inclined and weak interlayer is completed; and wherein:

[0027] the step S2 comprises the following steps: laying out the small-benches perpendicular to a stratus strike of a high slope in a mine with a gently-inclined and weak interlayer, and advancing risk elimination along the stratus strike; keeping a horizontal distance between the working surfaces for the risk elimination processes implemented on adjacent small-benches equal to or greater than 50 m, and conducting the risk elimination process on two or more small-benches at the same time; a landslide accumulation body collapsing along a free surface side by its own weight; stable structure of a consolidated accumulation body being destroyed by vibrations of an excavator bucket, and then the consolidated accumulation body collapses by its own weight.

[0028] In some embodiments of the present disclosure, a slope gradient of the small-bench is 5‰-7‰.

[0029] In some embodiments of the present disclosure, a height difference between two adjacent small-benches is determined according to an operating range of excavator.

[0030] In some embodiments of the present disclosure, in the step S1, a crawler-type impact hammer is used to excavate the small-benches on the stable bedrock below the weak interlayer.

[0031] As shown in FIG. 1, the method for treating a high and steep landslide in a mine with a gently-inclined and weak interlayer according to one or more embodiments of the present disclosure comprises the following steps S1˜S4.

[0032] As for step S1, as shown in FIG. 2, on a high slope 1 in a mine with a gently-inclined and weak interlayer, a crawler-type impact hammer is used to excavate small-benches 2 on stable bedrock below a weak interlayer 6, so as to form working surfaces for risk elimination processes of landslide.

[0033] As for step S2, the risk elimination process is conducted.

[0034] As for step S3, a landslide accumulation body 5 is transported to a crushing station or a rock dump site; specifically, the excavator 3 is used to clean up the landslide accumulation body 5, and a mine truck 4 is used to transport the landslide accumulation body 5 to a crushing station or a rock dump site.

[0035] As for step S4, the steps S1 to S3 are repeated, and the risk elimination along the working surface for the risk elimination process of landslide is continuously advanced until treatment of the high and steep landslide in a mine with a gently-inclined and weak interlayer is completed.

[0036] The step S2 may further comprise the following steps S2.1˜S2.3:

[0037] As for step S2.1, the small-benches 2 are laid out perpendicular to a stratus strike of a high slope 1 in a mine with a gently-inclined and weak interlayer, and risk elimination along the stratus strike is advanced. In one or more embodiments, slope inclination a of the small-bench 2 is 75°, as shown in FIG. 3. A width a of the small-benches is 4 m. In order to ensure a speed of landslide treatment, the width of the small-bench should not be too wide, as long as it can meet operating requirement of the excavator 3. In order to facilitate drainage of accumulated water during the landslide treatment, a slope gradient of the small-bench is set to be 5‰.

[0038] As for step S2.2, the excavator 3 is used to advance the risk elimination, and a horizontal distance L between the working surfaces for the risk elimination processes implemented on adjacent small-benches is kept to be equal to or greater than 50 m. On premise of safe risk elimination processes, the risk elimination processes on two or more small-benches 2 are conducted at the same time. As shown in FIG. 3, a height difference h between two adjacent small-benches is set to be 7.5 m to meet an operating range 7 of the excavator 3. The operating range 7 of the excavator 3 is shown in FIG. 5.

[0039] As for step S2.3, a landslide accumulation body 5 collapses along a free surface side by its own weight to avoid influence of blasting on stability of the landslide accumulation body 5. Stable structure of a consolidated accumulation body is destroyed by vibrations of a bucket of the excavator, and then the consolidated accumulation body collapses by its own weight.

[0040] In one or more embodiments, the landslide treatment is carried out from top to bottom. As shown in FIG. 6, the working surface for risk elimination process should be promoted from top small-benches. An advancing distance of the working surface for risk elimination process is set in strict accordance with requirements of specification. After the advancing distance of the working surface for risk elimination process of a first row of the small-benches is equal to or greater than 50 meters, the working surface for risk elimination process of next row of the small-benches starts to work, and so on. After the advancing distance of the working surface for risk elimination process of a second row of the small-benches is kept to be equal to or greater than 50 meters, the working surface for the risk elimination process of a third row of the small-benches starts to work, and so on. As shown in FIG. 7, the landslide accumulation body 5 collapses in a direction as shown by the arrows in FIG. 7. The landslide accumulation body 5 collapses down by its own weight along a slope of the weak interlayer and a direction of natural angle of repose A of about 40°, and then the mine truck 4 is used to transport away collapsed landslide accumulation body 5.

[0041] The above-mentioned specific embodiments are merely explanations of the present disclosure, not a limitation of the invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

[0042] The technical scheme according to one or more embodiments of the present disclosure can completely remove the landslide accumulation body, treat the landslide from the root cause, and avoid possibility of a secondary landslide. The technical scheme according to one or more embodiments of the present disclosure has high feasibility, and apparatus involved for the landslide treatment is common mine apparatus, which can quickly and efficiently treat the landslide, and effectively reduce cost of the landslide treatment.