首页|Fixed-length roof cutting with vertical hydraulic fracture based on the stress shadow effect:A case study

Fixed-length roof cutting with vertical hydraulic fracture based on the stress shadow effect:A case study

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
  • 维普
Pre-driven longwall retracement roadway(PLRR)is commonly used in large mine shaft.The support crushing disasters occur frequently during the retracement,and roof management is necessary.Taking the 31107 panel as research background,the roof breaking structure of PLRR is analyzed.It is concluded that the roof cutting with vertical hydraulic fracture(HF)at a specified position,that is,fixed-length roof cutting,can reduce support load and keep immediate roof intact.The extended finite element method(XFEM)is applied to simulate hydraulic fracturing.The results show that both the axial and transverse hydraulic fracturing cannot effectively create vertical HFs.Therefore,a novel construction method of ver-tical HF based on the stress shadow effect(SSE)is proposed.The stress reversal region and HF orientation caused by the prefabricated hydraulic fracture(PF)are verified in simulation.The sub-vertical HFs are obtained between two PFs,the vertical extension range of which is much larger than that of directional hydraulic fracturing.The new construction method was used to determine the field plan for fixed-length roof cutting.The roof formed a stable suspended structure and deformation of the main PLRR was improved after hydraulic fracturing.

Roof cuttingHydraulic fractureStress shadow effectRetracement roadwayExtended finite element method

Feiteng Zhang、Xiangyu Wang、Jianbiao Bai、Wenda Wu、Bowen Wu、Guanghui Wang

展开 >

School of Mines,China University of Mining&Technology,Xuzhou 221116,China

State Key Laboratory of Coal Resources and Safe Mining,China University of Mining&Technology,Xuzhou 221116,China

Postgraduate Research&Practice Innovation Program of Jiangsu ProvinceNational Key Research and Development Pro-gram of ChinaNational Natural Science Foundation of China

KYCX21_23582020YFB131420452074239

2022

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCDSCIEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2022.32(2)
  • 4
  • 6