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Method for improving pre-splitting crack-forming effect by pre-grouting and reinforcing surrounding rock of side slope

A technology of grouting reinforcement and pre-grouting, which is applied in excavation, soil protection, climate change adaptation, etc., can solve the problems of increased risk factors and high cost, and achieve simple process, less material consumption and fast construction speed Effect

Active Publication Date: 2019-08-23
福建省新华都工程有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main support methods are: gravity retaining wall support, anti-slide pile support, and anchor cable (rod) lattice beam support. This reinforcement method must be accompanied by high cost, site occupation, high-altitude operations, and risk factors. Significantly increased

Method used

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  • Method for improving pre-splitting crack-forming effect by pre-grouting and reinforcing surrounding rock of side slope
  • Method for improving pre-splitting crack-forming effect by pre-grouting and reinforcing surrounding rock of side slope
  • Method for improving pre-splitting crack-forming effect by pre-grouting and reinforcing surrounding rock of side slope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment one, such as Figure 1~4 As shown, a method of pre-grouting to strengthen the surrounding rock of the slope to improve the effect of pre-cracking and cracking is carried out according to the following steps:

[0042] S1: Determine the weathered and broken area of ​​the slope near the end, stake out the end slope, delineate the scope of grouting reinforcement, and design the design slope top line 1 and design slope bottom line 2;

[0043] S2: Through the indoor grouting test, the feasibility of gel material grouting reinforcement for broken rock mass is tested and analyzed, and the effect of grouting amount, grout ratio scheme, accelerator and age on the broken rock mass reinforcement is obtained; cement is used Slurry is used as a gel material. The water-cement ratio of the cement slurry is 1:1, and its diffusion radius is 2-6 meters. Then, the grouting holes are drilled and staked out in the grouting reinforcement area. layout;

[0044] S3: Grouting hole d...

Embodiment 2

[0065] Embodiment 2, a method for pre-grouting and strengthening the surrounding rock of the slope to improve the effect of pre-cracking and cracking, is carried out according to the following steps:

[0066] S1: Determine the weathered and broken area of ​​the slope near the end, stake out the end slope, and delineate the scope of grouting reinforcement;

[0067] S2: Drill and stake out the grouting hole in the grouting reinforcement area;

[0068] S3: Grouting hole drilling;

[0069] S4: cleaning the grouting hole;

[0070] S5: performing pressure grouting on the grouting hole;

[0071] S6: Confirm that the grouting pressure and grouting amount in the grouting hole meet the requirements;

[0072] S7: After confirming that the grout in the grouting hole has reached gel time and sufficient strength, implement vibration-reducing controlled blasting to protect the slope;

[0073] S8: Arrange pre-split holes along the contour of the designed slope in the blasting area, arrang...

Embodiment 3

[0086] Embodiment 3, a method for pre-grouting and strengthening the surrounding rock of the slope to improve the effect of pre-cracking and cracking, is carried out according to the following steps:

[0087] S1: Determine the weathered and broken area of ​​the slope near the end, stake out the end slope, and delineate the scope of grouting reinforcement;

[0088] S2: Drill and stake out the grouting hole in the grouting reinforcement area;

[0089] S3: Grouting hole drilling;

[0090] S4: cleaning the grouting hole;

[0091] S5: performing pressure grouting on the grouting hole;

[0092] S6: Confirm that the grouting pressure and grouting amount in the grouting hole meet the requirements;

[0093] S7: After confirming that the grout in the grouting hole has reached gel time and sufficient strength, implement vibration-reducing controlled blasting to protect the slope;

[0094] S8: Arrange pre-split holes along the contour of the designed slope in the blasting area, arrang...

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Abstract

The invention relates to a method for improving pre-splitting crack-forming effect by pre-grouting and reinforcing a surrounding rock of a side slope, and the method comprises the following steps of:determining a weathering and crushing area near to an ending slope, carrying out the ending slope setting-out, and defining the range of grouting and reinforcing; carrying out setting-out to a grouting hole and a drilling hole in a pre-grouting and reinforcing range; molding the grouting hole and the drilling hole; carrying out cleaning to the grouting hole; carrying out pressure grouting to the grouting hole; and confirming that the grouting pressure and grouting amount in the grouting hole reach the requirements. The process consolidates the fractured rock mass into a whole by pre-grouting and blocking a groundwater seepage channel in a rock stratum. Measures such as blasting, pre-cracking and shock absorption are supplemented to increase the half-hole ratio and ensure the stability of the side slope; and favorable conditions are provided for safe and efficient mining of mines.

Description

technical field [0001] The invention belongs to the field of mining, and in particular relates to a method for pre-grouting and reinforcing slope surrounding rock to improve the effect of pre-cracking and forming cracks. Background technique [0002] The stability of mine slopes is closely related to production safety, directly related to personal safety and property safety. However, with the deepening of mining depth, the existence of structures and fracture zones in the slope rock mass may cause geological disasters such as ground fissures, landslides, and landslides at any time if no measures are taken. [0003] Pre-splitting blasting is a controlled blasting technology near the side of open-pit mines, the main purpose of which is to slow down the adverse effects of blasting vibration through pre-splitting. However, in large-area mine slope rock formations, there are bound to be unfavorable geological structures such as fractured structures, scattered structures, and str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/20E02D3/12F42D1/00F42D3/04
CPCE02D3/12E02D17/20E02D2250/003F42D1/00F42D3/04Y02A10/23
Inventor 崔年生
Owner 福建省新华都工程有限责任公司
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