US20180080320A1 - Method for over-pit and under-pit cooperative control of roofs of far and near fields of an extra-large stoping space - Google Patents

Method for over-pit and under-pit cooperative control of roofs of far and near fields of an extra-large stoping space Download PDF

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Publication number
US20180080320A1
US20180080320A1 US15/558,512 US201615558512A US2018080320A1 US 20180080320 A1 US20180080320 A1 US 20180080320A1 US 201615558512 A US201615558512 A US 201615558512A US 2018080320 A1 US2018080320 A1 US 2018080320A1
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Prior art keywords
pit
extra
hard roof
over
controlling
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US15/558,512
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English (en)
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Bin Yu
Zhiwen Yang
Hongfei Duan
Xiangbin Meng
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Datong Coal Mine Group Co Ltd
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Datong Coal Mine Group Co Ltd
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Assigned to DATONG COAL MINE GROUP CO., LTD. reassignment DATONG COAL MINE GROUP CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DUAN, Hongfei, MENG, XIANGBIN, YANG, Zhiwen, YU, BIN
Publication of US20180080320A1 publication Critical patent/US20180080320A1/en
Abandoned legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C37/00—Other methods or devices for dislodging with or without loading
    • E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
    • E21C37/14—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by compressed air; by gas blast; by gasifying liquids
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C41/00—Methods of underground or surface mining; Layouts therefor
    • E21C41/16—Methods of underground mining; Layouts therefor
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C37/00—Other methods or devices for dislodging with or without loading
    • E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
    • E21C37/12—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid

Definitions

  • the present invention relates to a method for controlling a hard roof of a coal mine, and more particularly, to a method for over-pit and under-pit cooperative control of roofs of far and near fields of an extra-large stoping space.
  • the destabilized fracture of high hard roof stratum causes more complicated stress field and cover rock spatial structure evolution
  • large-scale and intensive mining disturbance causes not only the cover rock in caving zone to move tempestuously, but also the spatial equilibrium structure in overlaying goaf to be more destabilized, which consequently causes large-scale abrupt pressure changes in the roof stratum in goaf, even impact ground pressure, coal and gas outburst and other dynamic disasters of coal and gas.
  • the effective pressure reduction is based on not only the control of the hard basic roof of near fields within 30 to 80 meters, but also the control of high hard basic roof of far fields within 100 to 350 meters. Therefore, it is necessary to develop a cooperative roof control method which aims at an extra-large stope and can effectively control the hard roof of near and far fields.
  • a Chinese patent document CN201510108115.7 discloses “Method and apparatus for weakening high hard roof having distance of 100-350m to coal seam”, which includes the adoption of the method for controlling a hard roof by means of hydraulic fracturing via a vertical bore, hereafter referred to as “the method for controlling a hard roof by means of hydraulic fracturing via a vertical bore”.
  • a Chinese patent document CN201510037487.5 discloses “Method for decreasing super high seam working face far-field tough roof impact ground pressure strength”, which includes the adoption of the method for controlling a hard roof by means of hydraulic fracturing via an L-shaped bore, hereafter referred to as “the method for controlling a hard roof by means of hydraulic fracturing via a L-shaped bore”.
  • a further Chinese patent document CN201210013370.x discloses “Method for controlling rock burst by pulse fracturing”, which includes the adoption of the method for controlling a hard roof via strong repeating impact pulse of high energy density, hereafter referred to as “the method for controlling a hard roof via strong repeating impact pulse of high energy density”.
  • a further Chinese patent document CN201210144077.7 discloses “Stratified blasting method for coal mine hard roof”, which includes the adoption of the method for controlling a hard roof via stratified blasting, hereafter referred to as “the method for controlling a hard roof via stratified blasting”.
  • a Chinese patent document CN201310483719.0 discloses “Method for increasing top-coal recovery rate in primary mining period of fully-mechanized caving face”, which includes the adoption of the method for controlling a hard roof via weakening by hydraulic fracturing, hereafter referred to as “the method for controlling a hard roof via weakening by hydraulic fracturing”.
  • the present invention aims at solving the problem of lacking comprehensive and cooperative hard roof control method for near and far field of an extra-large stoping space and provides a method for over-pit and under-pit cooperative control of roofs of far and near fields of an extra-large stoping space.
  • a method for over-pit and under-pit cooperative control of roofs of far and near fields of an extra-large stoping space includes a method for controlling a hard roof by means of hydraulic fracturing via an over-pit vertical bore of far field of an extra-large stoping space, a method for controlling a hard roof by means of hydraulic fracturing via an over-pit L-shaped bore of far field of an extra-large stoping space, a method for controlling a hard roof via an over-pit strong repeating impact pulse of high energy density of far field of an extra-large stoping space, a method for controlling a hard roof via down-pit water injection of near field of an extra-large stoping space, a method for controlling a hard roof via down-pit stratified blasting of near field of an extra-large stoping space, and a method for controlling a hard roof via weakening by hydraulic fracturing of near field of an extra-large stoping space;
  • the hard roof of far field is controlled by adopting the method for controlling a hard roof by means of hydraulic fracturing via an over-pit vertical bore of far field of an extra-large stoping space;
  • the hard roof of each target stratum is controlled by adopting the method for controlling a hard roof by means of hydraulic fracturing via an over-pit L-shaped bore of far field of an extra-large stoping space;
  • the weakened hard roof of each target stratum is further controlled by adopting the method for controlling a hard roof via an over-pit strong repeating impact pulse of high energy density of far field of an extra-large stoping space;
  • the over-pit constructive control of the hard roof of far field of an extra-large stoping space has been completed, simultaneously or successively, the down-pit constructive control of the hard roof of near field of an extra-large stoping space is conducted, firstly, the near-field hard roof is preliminary controlled by adopting the method for controlling a hard roof via down-pit water injection of near field of an extra-large stoping space;
  • the near-field hard roof is controlled and weakened in layers by adopting the method for controlling a hard roof via down-pit stratified blasting of near field of an extra-large stoping space;
  • the near-field hard roof is controlled by adopting the method for controlling a hard roof via weakening by hydraulic fracturing of near field of an extra-large stoping space.
  • a control of the far-field hard roof is realized by successively adopting over-pit vertical bore hydraulic fracturing method, over-pit L-shaped bore hydraulic fracturing method, over-pit strong repeating impact pulse of high energy density method, wherein the proper construction order of the above three methods not only maximizes their individual advantages, but also greatly strengthens their co-actions, which can be embodied as: 1)
  • the vertical bore hydraulic fracturing method is firstly adopted to intensively weaken a part of the far-field hard roof, but it has the defects of limited coverage, usually about several tens of meters in radius, for far-field hard roof of an extra-large stoping space, if vertical bore hydraulic fracturing method is adopted exclusively, multiple vertical bores are needed on the vast mining face, which consumes paramount human resource, material and money; 2)
  • the L-shaped bore hydraulic fracturing method focuses on weakening far-field hard roof of the same target strata, as the L-shaped bore can function within a larger coverage, it effectively makes up the defects of vertical bore hydraulic
  • the over-pit control methods can only weaken the far-field hard roof, while the near-field hard roof control must be controlled down-pit by successively adopting down-pit water injection method, down-pit stratified blasting method, and down-pit hydraulic fracturing method.
  • the proper construction order of the above three methods not only maximize their individual advantages, but also greatly strengthen their co-actions, which can be embodied as: 1) Firstly, moisten and weaken the near field hard roof by adopting down-pit water injection method, so as to strengthen the effects of the subsequent control methods, which is a conventional technical scheme in this field. But the weakening effect caused by down-pit water injection method on hard roof is limited by its injected moisture radius.
  • the down-pit stratified blasting method is aimed for the weakening of the hard roof in the same target strata, which enables the wedge groove pre-splitting crack to defuse outwards after the blast, after the near-field hard roof being preliminary weakened through water injection, the diffuseness of pre-splitting crack raises substantially than before; 3) After the near-field hard roof being preliminary weakened through moistening, further weakening through blasting, the adoption of down-pit hydraulic fracturing method can thoroughly weaken the hard roof at each target strata and in each space, whose weakening effect is significantly enhanced compared to that of independent adoption. As the far-field over-pit hard roof control method and the near-field down-pit hard roof control
  • the present invention has following advantages: 1) The over-pit and down-pit cooperatively control the hard roof of near and far fields, which effectively brings the strong pressure in extra-large stoping space under control; 2) The advantages of various methods are effected fully and the disadvantages of every means are compensated, which greatly improves the weakening effects of hard roof; and 3) The bores in over-pit and down-pit can used independently and cooperatively, which significantly reduces the cost of time, human resources, materials and money.
  • FIG. 1 is the schematic constructional view of the far-field over-pit vertical bore hydraulic fracturing hard roof control method for extra-large stoping space and the far-field over-pit L-shaped bore hydraulic fracturing hard roof control method for extra-large stoping space.
  • FIG. 2 is the schematic structural view of blast bore and hydraulic fracturing bore
  • 1 -L shape bore
  • 2 vertical bore
  • 3 perforating slots
  • 4 ground
  • 5 far-field hard roof
  • 6 near-field hard roof
  • 7 working face
  • 8 blast bore
  • 9 hydro-fracturing bores
  • 10 wedge pre-splitting crack.
  • the method for over-pit and under-pit cooperative control of a roofs of far and near fields of an extra-large stoping space includes a method for controlling a hard roof by means of hydraulic fracturing via an over-pit vertical bore of far field of an extra-large stoping space, a method for controlling a hard roof by means of hydraulic fracturing via an over-pit L-shaped bore of far field of an extra-large stoping space, a method for controlling a hard roof via an over-pit strong repeating impact pulse of high energy density of far field of an extra-large stoping space, a method for controlling a hard roof via down-pit water injection of near field of an extra-large stoping space, a method for controlling a hard roof via down-pit stratified blasting of near field of an extra-large stoping space, and a method for controlling a hard roof via weakening by hydraulic fracturing of near field of an extra-large stoping space;
  • the hard roof of far field is controlled by adopting the method for controlling a hard roof by means of hydraulic fracturing via an over-pit vertical bore of far field of an extra-large stoping space, which specifically includes the following steps:
  • the hard roof of each target stratum is controlled by adopting the method for controlling a hard roof by means of hydraulic fracturing via an over-pit L-shaped bore of far field of an extra-large stoping space, which specifically includes the following steps:
  • the weakened hard roof of each target stratum is further controlled by adopting the method for controlling a hard roof via an over-pit strong repeating impact pulse of high energy density of far field of an extra-large stoping space, which specifically includes the following steps:
  • the near-field hard roof is preliminary controlled by adopting the method for controlling a hard roof via down-pit water injection of near field of an extra-large stoping space, which specifically includes the following steps:
  • the near-field hard roof is controlled and weakened in layers by adopting the method for controlling a hard roof via down-pit stratified blasting of near field of an extra-large stoping space, which specifically includes the following steps:
  • the near-field hard roof is controlled by adopting the method for controlling a hard roof via weakening by hydraulic fracturing of near field of an extra-large stoping space, which specifically includes the following steps:
  • each hydraulic fracturing bore has a plurality of hydraulic fracturing segments, repeating the above steps to conduct the fracturing work in segments and complete the work of all the hydraulic fracturing segments of each hydraulic fracturing bore.
US15/558,512 2015-12-11 2016-06-20 Method for over-pit and under-pit cooperative control of roofs of far and near fields of an extra-large stoping space Abandoned US20180080320A1 (en)

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Application Number Priority Date Filing Date Title
CN201510912242.2A CN105545307A (zh) 2015-12-11 2015-12-11 特大采场空间远近场井上下协同顶板控制方法
CN201510912242.2 2015-12-11
PCT/CN2016/000321 WO2017096674A1 (zh) 2015-12-11 2016-06-20 特大采场空间远近场井上下协同顶板控制方法

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CN110424965A (zh) * 2019-07-19 2019-11-08 天地科技股份有限公司 一种煤矿冲击地压防治结构和方法
CN112127864A (zh) * 2020-09-23 2020-12-25 中煤科工集团重庆研究院有限公司 一种立井揭煤区域多煤层分段水力压裂方法
CN112483085A (zh) * 2020-11-25 2021-03-12 大同煤矿集团有限责任公司 基于复合射孔在小煤柱或无煤柱切顶卸压的开采工艺
CN112709572A (zh) * 2019-10-24 2021-04-27 西安闪光能源科技有限公司 基于可控冲击波增透的石门揭煤方法
CN112709575A (zh) * 2019-10-24 2021-04-27 西安闪光能源科技有限公司 一种基于可控冲击波预裂的坚硬厚煤层放顶煤方法
CN112796712A (zh) * 2021-03-26 2021-05-14 山西省煤炭地质勘查研究院 一种采空区与煤层压裂综合抽采方法
CN112855123A (zh) * 2021-01-19 2021-05-28 兖州煤业股份有限公司 一种大直径卸压钻孔深度的确定方法
CN113216965A (zh) * 2021-05-20 2021-08-06 山西鑫桥科技有限公司 一种防治冲击地压的方法
CN113266367A (zh) * 2021-05-31 2021-08-17 太原理工大学 一种坚硬顶板巷道液压棒自动化切顶方法
CN113339071A (zh) * 2021-07-06 2021-09-03 中国矿业大学 一种探测顶板预裂爆破损伤程度和范围的方法
CN113338925A (zh) * 2021-06-30 2021-09-03 中国矿业大学 一种多煤层开采大巷遗留煤柱源头压裂防动载压架方法
CN114033375A (zh) * 2021-11-26 2022-02-11 重庆大学 一种水力切槽与高压劈裂耦合的坚硬顶板造缝方法

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CN106050234B (zh) * 2016-05-26 2019-01-25 中国神华能源股份有限公司 在煤炭开采过程中对地下水进行保护的施工工艺
CN109886550B (zh) * 2019-01-23 2023-05-12 太原理工大学 煤矿地面压裂坚硬顶板控制强矿压效果综合评价方法
CN109779634B (zh) * 2019-01-24 2021-03-05 太原理工大学 煤矿地面垂直井压裂坚硬顶板位置确定方法
CN110080769B (zh) * 2019-05-09 2021-01-12 大同煤矿集团有限责任公司 一种煤矿临空回采巷道坚硬顶板地面精准切顶卸压方法
CN110185448A (zh) * 2019-05-19 2019-08-30 中铁十九局集团矿业投资有限公司 一种地面压裂和井下爆破控制深部矿体岩爆方法
CN112709571A (zh) * 2019-10-24 2021-04-27 西安闪光能源科技有限公司 基于可控冲击波预裂卸压的煤矿巷道冲击地压防治方法
CN112709573B (zh) * 2019-10-24 2023-08-11 西安闪光能源科技有限公司 基于可控冲击波预裂的坚硬采煤工作面冲击地压防治方法
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Publication number Priority date Publication date Assignee Title
CN110424965A (zh) * 2019-07-19 2019-11-08 天地科技股份有限公司 一种煤矿冲击地压防治结构和方法
CN112709572A (zh) * 2019-10-24 2021-04-27 西安闪光能源科技有限公司 基于可控冲击波增透的石门揭煤方法
CN112709575A (zh) * 2019-10-24 2021-04-27 西安闪光能源科技有限公司 一种基于可控冲击波预裂的坚硬厚煤层放顶煤方法
CN112127864A (zh) * 2020-09-23 2020-12-25 中煤科工集团重庆研究院有限公司 一种立井揭煤区域多煤层分段水力压裂方法
CN112483085A (zh) * 2020-11-25 2021-03-12 大同煤矿集团有限责任公司 基于复合射孔在小煤柱或无煤柱切顶卸压的开采工艺
CN112855123A (zh) * 2021-01-19 2021-05-28 兖州煤业股份有限公司 一种大直径卸压钻孔深度的确定方法
CN112796712A (zh) * 2021-03-26 2021-05-14 山西省煤炭地质勘查研究院 一种采空区与煤层压裂综合抽采方法
CN113216965A (zh) * 2021-05-20 2021-08-06 山西鑫桥科技有限公司 一种防治冲击地压的方法
CN113266367A (zh) * 2021-05-31 2021-08-17 太原理工大学 一种坚硬顶板巷道液压棒自动化切顶方法
CN113338925A (zh) * 2021-06-30 2021-09-03 中国矿业大学 一种多煤层开采大巷遗留煤柱源头压裂防动载压架方法
CN113339071A (zh) * 2021-07-06 2021-09-03 中国矿业大学 一种探测顶板预裂爆破损伤程度和范围的方法
CN114033375A (zh) * 2021-11-26 2022-02-11 重庆大学 一种水力切槽与高压劈裂耦合的坚硬顶板造缝方法

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