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公开(公告)号：US20210355826A1
公开(公告)日：2021-11-18
申请号：US16613926
申请日：2018-09-20
Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY
Inventor： Nan Zhou , Meng Li , Hao Yan , Jixiong Zhang , Hengfeng Liu
Abstract: Provided is a method for recovering room-type coal pillars by cemented filling of reserved roadways, which is especially suitable for safe and efficient recovery of left coal pillars in room-type mining faces in mining areas where the ecological system is fragile, such as in western China. In the method, by constructing reserved roadways in two adjacent rows of room-type goafs, excavating coal pillar roadways in room-type coal pillars, and finally interconnecting the reserved roadways with the coal pillar roadways to form a U-shaped working face, room-type left coal pillars are recovered. Thus, not only the workload of roadway excavation is reduced, but also the recovery ratio of the coal resources is maximized. The method provides a novel technical model for the recovery of room-type left coal pillars in mining areas, such as in western China.
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公开(公告)号：US20200241169A1
公开(公告)日：2020-07-30
申请号：US16756819
申请日：2019-04-18
Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY
Inventor： Meng Li , Jixiong Zhang , A.J.S. (Sam) Spearing , Zhongya Wu , Nan Zhou , Feng Gao
Abstract: The present invention discloses a method for determining internal stress of a solid filling material, comprising the following steps: step 1) acquiring stress data of the solid filling material, and fitting the stress-strain relationship of the solid filling material; step 2) calculating surface subsidence in the solid filling area on the basis of an equivalent mining height theory with a probability integration method; step 3) calculating the expansion height of fractured zones in the area under a solid-backfill coal mining condition; step 4) calculating the strain in the solid filling material at a distance L from the rear of the stope by combing with step 2) and step 3); step 5) calculating internal stress in the solid filling material at distance L from the rear of the working face. The present invention attains the following beneficial effects: the present invention provides a method for calculating the stress in filling mass for solid-backfill coal mining. The method is simple and practical, and is of great significance for reckoning the distribution of the stress in the surrounding rock for solid backfill mining, guiding the backfill mining support design, and enriching the backfill mining pressure theory system.
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13.发明授权公开(公告)号：US10352167B2
公开(公告)日：2019-07-16
申请号：US16084971
申请日：2016-12-01
Applicant: China University of Mining and Technology
Inventor： Jixiong Zhang , Nan Zhou , Wenyue Qi , Qiang Zhang , Meng Li
Abstract: The present invention discloses a process method for withdrawing and recovering a mechanical constant-resistance single prop, specific steps involving: detecting a working resistance and a degree of deformation of a mechanical constant-resistance single prop, releasing lug clamp bolts of a recoverable base, knocking a lower portion of a cylinder body of the mechanical constant-resistance single prop to disengage the mechanical constant-resistance single prop from the recoverable base, and dismantling the mechanical constant-resistance single prop. Parts are classified and recovered based on degree of deformation thereof. By means of the foregoing method, a process of withdrawing and recovering a mechanical constant-resistance single prop is standardized, simple and fast disengagement of the mechanical constant-resistance single prop is achieved, and parts that can still be used can be sufficiently recovered and reused, thereby achieving the objectives of saving energy and reducing costs.
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