公开(公告)号：US20200378258A1

公开(公告)日：2020-12-03

申请号：US16609738

申请日：2019-01-25

Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Inventor： Wenping LI ,  Weichi CHEN ,  Zhi YANG ,  Qiqing WANG ,  Kaifang FAN

IPC: E21F17/18 ,  G01F23/04

Abstract: A method for classifying a phreatic leakage disaster level in shallow coal seam mining includes the following steps: S1. arranging a monitoring hole in a coal mine working face and burying a telemetering water level gauge to perform water level monitoring; S2. monitoring a ground elevation, calculating a ground subsidence amount, and collecting drilling footage information; S3. plotting variation relationship curves of drilling footage and phreatic water level as well as drilling footage and ground subsidence according to monitored information, respectively; and S4. comparing the curves with a no-leakage graph, a slight-leakage graph, and a heavy-leakage graph, and determining a leakage level; and S5. further classifying a studied area as an environmental disaster area or an environmentally friendly area.

公开(公告)号：US20220290563A1

公开(公告)日：2022-09-15

申请号：US17411061

申请日：2021-08-25

Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Inventor： Wenping LI ,  Weichi CHEN ,  Qiqing WANG ,  Jianghui HE ,  Wei QIAO ,  Liangning LI ,  Yuru YANG

IPC: E21C39/00 ,  E21B49/00 ,  G01N33/24

Abstract: A monitoring device and a monitoring method for dynamic development of an overburden mining separated bed are provided. The monitoring device includes a settlement magnetic ring assembly and a mounting conduit. The settlement magnetic ring assembly includes an anchor strap assembly, a magnetic induction iron ring and a magnetic ring sleeve sleeved outside the magnetic induction iron ring. The anchor strap assembly is arranged at the outer circumference of the magnetic ring sleeve and has a contraction state and an expansion state. The anchor strap assembly in the contraction state can move in a monitoring hole, and at least two fixing points at different heights are formed in the anchor strap assembly in the expansion state and the wall of the monitoring hole in a vertical direction. Two ends of the mounting conduit are connected to a drill rod and the magnetic ring sleeve respectively.