Title:
STRESS TRANSFER METHOD AND DEVICE FOR LOW-POSITION ROOF CUTTING AND HIGH-POSITION DIRECTIONAL FRACTURING OF GOB-SIDE ENTRY RETAINING
Document Type and Number:
WIPO Patent Application WO/2024/077841
Kind Code:
A1
Abstract:
Disclosed in the present invention are a stress transfer method and device for low-position roof cutting and high-position directional fracturing of gob-side entry retaining. A low-position immediate roof is subjected to directional fracturing by a dense linear sleeve fracturing method and the like, so that the length of a lateral cantilever of the immediate roof is shortened, and the stress transfer from a gob roof to an entry retaining roof brought by hanging the immediate roof is weakened; a high-position main roof is subjected to fracturing by a directional fracturing method, so that the original gob roof stress transferred by the main roof is weakened, the load applied to entry retaining surrounding rock is reduced to the maximum extent from the source, and ultimately, the objectives of implementing immediate roof cutting entry retaining by low-position sleeve fracturing and implementing stress transfer by high-position directional fracturing of the main roof are achieved, thereby reducing the deformation of gob-side entry retaining surrounding rock. Also disclosed is a main machine-slidable drilling and fracturing all-in-one equipment, comprising: mounting a fracturing pump on a drilling machine travelling mechanism, and additionally providing a sliding rail to enable a main machine to slide forward and backward along the sliding rail. The consistency of inclination parameters for dense drilling of a low-position rock formation is ensured, and an eccentricity error is prevented from occurring and affecting the effect of entry retaining via roof cutting; moreover, the number of movements of a drilling machine is reduced, and the construction efficiency is improved.
Inventors:
ZHAO XINGLONG (CN)
HUANG BINGXIANG (CN)
SHAO LUYING (CN)
CHEN SHULIANG (CN)
LI HAOZE (CN)
HUANG BINGXIANG (CN)
SHAO LUYING (CN)
CHEN SHULIANG (CN)
LI HAOZE (CN)
Application Number:
PCT/CN2023/078945
Publication Date:
April 18, 2024
Filing Date:
March 01, 2023
Export Citation:
Assignee:
CHINA UNIV OF MINING AND TECHNOLOGY (CN)
XUZHOU USURE MINING TECH CO LTD (CN)
XUZHOU USURE MINING TECH CO LTD (CN)
International Classes:
E21C37/12; E21B7/02; E21B43/26
Attorney, Agent or Firm:
NANJING JINGWEI PATENT & TRADEMARK AGENCY CO., LTD (CN)
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