China University of Mining and Technology

Other

Chinese Academy of Sciences

Manchao He

Beijing Zhongkuang Innovation Alliance Energy Environment Science Academy

Jing-jin Electric Technologies Co., Ltd.

Xia, Min

Min Xia

Center for Hydrogeology and Environmental Geology Survey, Cgs

He, Manchao

Hui Zhou

Jun Yang

Shengwen Qi

Bowen Zheng

Hongyan Guo

Yu Zou

Songfeng Guo

Xiaoming Sun

Guangming Luo

Jiong Wang

Xiaojie Yang

Zhibiao Guo

Jie Hu

Guangyuan Yu

Yajun Wang

Dongqiao Liu

Jiuping Wang

Hongchao Li

Haijiang Zhang

Zhigang Tao

Yi Zhang

Bin Zhang

Qiang Fu

Guohua Cao

Dejian Li

Liu Yang

Xiaolin Huang

Ning Liang

Zhiqing Li

Lihui Li

Fengjiao Tang

Wenfei Li

Jinxuan Li

Zimin Ma

Zhehan Yu

Chunguang Wang

Yubing Gao

Yongshuang Zhang

Weiluan Wen

Shangyuan Chen

Guoqiang Xiao

Gonghua Chen

Han Sun

Di Peng

Benchao Xu

Chengyu Miu

Shulin Zhang

Fei Gong

Jiawei Cai

Fawang Zhang

Guangtao Dong

Mingming Ren

Guofeng Zhang

Xuena Jia

A tertiary cooperative compression yielding and energy-absorbing support mechanism. The compression yielding and energy-absorbing anchor cables play a basic support role, and the circumferential compression yielding device can make the primary support compression yielding arch frame have a constant resistance deformation in the circumferential direction, while the primary support compression yielding arch frame and the secondary lining steel arch frame have a relative dislocation movement in the radial compression yielding device, and the tertiary compression yielding and energy-absorbing structures are cooperated with each other to adapt to the over-meter large deformation movement of the surrounding rock.

Tertiary cooperative compression yielding and energy-absorbing support mechanism

A method and apparatus for classifying water-rich weak surrounding rock based on in-situ scribing are provided. The method includes placing a scribing device on tunnel cross-sections of varying lengths; performing in-situ scribing on the tunnel cross-sections to obtain the mechanical parameters of the surrounding rock and determining the surrounding rock strength at different locations; while performing in-situ scribing, employing near-infrared spectroscopy to simultaneously measure the in-situ spectrum of the tunnel surrounding rock, thereby determining the surface water content at different locations; based on the scribing mechanical parameters of the tunnel surrounding rock, establishing a scribing depth curve, and calculating a joint development degree of the tunnel surrounding rock at different locations from the scribing depth curve; and based on the surrounding rock strength, surface water content, and joint development degree of the tunnel surrounding rock at different locations, classifying the surrounding rock grades of the tunnel cross-section.

Method and apparatus for classifying water-rich weak surrounding rock based on in-situ scribing

The present disclosure relates to the technical field of mine ventilation, and in particular, to a three-dimensional ventilation method and system for mining by 110 construction method in coal and gas outburst mines. The three-dimensional ventilation method comprises: constructing a first process roadway and/or a second process roadway before stopping the working face; forming a first roof-cutting and roadway retaining section by a part of the working face track gate located in the goaf, and/or forming a second roof-cutting and roadway retaining section by a part of the working face transport gate located in the goaf during the stopping process of the working face, so that the air inlet of the first roof-cutting and roadway retaining section enters the gas drainage air return roadway through the first process roadway to form return air, and/or the inlet air of the second roof-cutting and roadway retaining section enters the gas drainage air inlet roadway through the second process roadway to form return air, the three-dimensional ventilation system is constructed by using the gas drainage air inlet roadway and the gas drainage air return roadway, during the conversion from the 121 construction method to the 110 construction method, a complete ventilation system can be formed in the roadway retaining section, real-time monitoring of the roadway retaining section can be carried while eliminating harmful gas accumulation in the retaining section.

Three-dimensional ventilation method and system for mining by 110 construction method in coal and gas outburst mines

The present disclosure relates to a technical field of coal mining, particularly to a method of no-pillar mining with gob-entry retaining adapted for fully-mechanized top coal caving in a thick coal seam, which comprises the following steps: reinforcing support on a roof and two sides of a roadway; performing roof slitting blasting to form a pre-splitting slit; erecting a temporary support device and a gangue retaining device in the roadway along the retained entry; performing no caving within a range of a preset distance at an end of the working face near the retained entry side; and removing the temporary support device in the roadway after entry forming stabilizes, and closing the goaf to complete entry retaining. The roof slitting blasting is more beneficial to collapse of strata in the goaf, so that the strata in the slit can better fill stoping space after collapse, and the roof of the retained entry forms a short arm beam structure laterally, which avoids forming a long suspended roof in the goaf, and improves the stress of surrounding rock of gob-side entry retaining; coal caving is not performed in a certain range at the end of the working face of the retained entry side, which further ensures the filling effect of the goaf on the retained entry side, effectively limits the rotary sinking of blocks of the main roof, and greatly reduces effect on the stability of the retained entry.

Method of no-pillar mining with gob-entry retaining adapted for fully-mechanized top coal caving in thick coal seam

A rock burst active prevention and control mechanism, which includes: a NPR reinforcing mesh, rod bodies, NPR steel panels, an embedding reinforcement and a NPR steel fibre concrete, the NPR reinforcing mesh is formed by horizontal and vertical interlacing of NPR steel bars, and is provided against a surrounding rock of a tunnel, extending ends of the rod bodies are penetrated out of a hole of the NPR reinforcing mesh, the NPR steel panels are provided with multiple through-holes, the rod bodies, which are located on a same radial plane in the tunnel, are connected to one of corresponding NPR steel panels, the embedding reinforcement is connected between the extending ends of two adjacent rod bodies, the NPR steel fibre concrete is overlaid on the extending ends of the rod bodies and the embedding reinforcement.

Rock burst active prevention and control mechanism

A processing method of NPR steel rebar coil is disclosed. The NPR steel rebar is cold processed and has a diameter of less than 14 mm, and has a yield strength of 800&#x2dc;950 MPa, a tensile strength of 900&#x2dc;1100 MPa, and a elongation of not less than 20%. The processing method comprises: an I-shaped placing step L, an uncoiling step L, a flattening step L, a pointing step L, a butt welding step L, a hydraulic head-pushing step L, a cold drawn smoothing step L, a grit blasting step L, an in-situ inline annealing step L, an air-cooled tempering step L, a coiling step L, a placing step L, a flattening step L, a cold drawn spiral ribbing step L, a straightening step L, and a coiling step L. The method can achieve full intelligence, meet the processing requirements and the automatic intelligent production requirements of NPR steel rebar coil.

Processing method of NPR steel rebar coil

An adjustable device for railway to cross active faults is provided to fix a rail and a sleeper, including: a fastener mounting base, disposed between the rail and sleeper; clamping pipes, disposed between the fastener mounting base and the sleeper, the sleeper is provided with a through groove, and the clamping pipes are detachably fixed inside the through groove; control parts, disposed on an inner wall of the clamping pipes, each of the control parts is configured to detect lateral pressures between the fastener mounting base and corresponding one of the clamping pipes, thereby to separate the corresponding one of the clamping pipes from the through groove, the device ensures that the rail will not produce bending deformations after the lateral dislocation of the bottom layer during earthquake events, and ensure that a train or rail repair vehicle can pass at a low speed after earthquake.

Adjustable device for railway to cross active faults

A processing method of NPR steel rebar rod is disclosed. The NPR steel rebar is cold processed and has a yield strength of 800&#x2dc;950 MPa, a tensile strength of 900&#x2dc;1100 MPa, and a percentage elongation at maximum force of not less than 10&#x2dc;40%. The processing method comprises the following steps: a I-shaped placing step L, an uncoiling step L, a flattening step L, a butt welding step L, a sandblasting step L, a straightening step L, a pointing step L, a hydraulic head-pushing step L, a cold drawn spiral ribbing step L, a straight forward continuous wire drawing and traction step L, a pre-straightening step L, a fine straightening step L, and a cutting-off step L. The processing method can meet the automatic intelligent production requirements of NPR steel rebar, cold rolled spiral NPR steel rebar, and pre-stressed NPR steel rebar.

Processing method of NPR steel rebar rod

Disclosed is a tunnel protection structure suitable for active fault areas and high ground stress areas, and relates to the technical field of tunnel engineering construction. The tunnel protection structure comprises at least one protection unit, wherein a plurality of protection units are sequentially connected and distributed along the axial direction of a tunnel, and the protection units comprise a radial protection ring and two axial protection rings which are fixedly arranged between a lining structure and surrounding rock and are distributed along the axial direction of the tunnel; the radial protection ring comprises a plurality of radial buffer energy consumption layers which are sequentially sleeved along the radial direction of the tunnel; and the axial protection ring comprises a plurality of axial buffer energy consumption layers which are sequentially and fixedly connected along the axial direction of the tunnel.

Tunnel protection structure suitable for active fault areas and high ground stress areas

A coal mining method is provided without coal-pillar leaving and without laneway excavation in a full mining area. The coal mining method includes drilling a main shaft, an auxiliary shaft and a return air shaft from a ground to a coal mining layer; by a coal mining machine, forming a first mining face with a first direction as an advance direction; by the coal mining machine, cutting out a first haulageway and a first return airway while cutting the coal wall at the first mining face, and preserving the first haulageway and the first return airway. In this method, the first haulageway and the first return airway are located on two sides of the first mining face, the first haulageway is in communication with both of the main and auxiliary shafts, and the first return airway is in communication with the return air shaft.

Method for coal mining without reserving coal pillar and tunneling roadway in whole mining area

An underground longwall mining method includes drilling a main shaft and an auxiliary shaft from a ground to a coal bed and exploiting in the coal bed first and second connection laneways. The first connection laneway is in communication with the main shaft, and the second connection laneway is in communication with the auxiliary shaft. The method further includes communicating the first and second connection laneways, and using a communication part between the first connection laneway and the second connection laneway as a first open-off cut; and by using a direction of the first open-off cut further away from the connecting line connecting the main shaft and the auxiliary shaft as a first direction, and exploiting by cutting a coal wall in the first direction using a coal mining machine.

Underground longwall mining method

An NPR non-magnetic steel material for rock bolt and a production method thereof are disclosed. The NPR non-magnetic steel material for rock bolt has a composition, in weight percent, consisting of: C: 0.4-0.7%, MN: 15-20%, Cr: 1-18%, Si: 0.3-3%, Ca: 0.05-0.15%, Cu: &#x2264;0.03%, Ni: &#x2264;0.02%, S: &#x2264;0.001%, P: &#x2264;0.001%, and the rest being Fe and unavoidable impurity elements. The NPR non-magnetic steel material for rock bolt and the production method thereof effectively solve the problems of steel materials for rock bolt in the prior art such as strong magnetism, low tensile strength and low effective elongation. The NPR non-magnetic steel material for rock bolt has a fully-austenitized structure and is non-magnetic, its yield strength is adjustable in the range of 600-1000 MPa, and its elongation is adjustable in the range of 20-60%.

NPR non-magnetic steel material for rock bolt and production method thereof

An NPR steel material for rock bolt and a production method thereof are disclosed. The NPR steel material for rock bolt has a composition, in weight percent, consisting of: C: 0.4-0.7%, Mn: 15-20%, Si: &#x2264;0.1%, Cu: &#x2264;0.03%, Cr: &#x2264;0.01%, Ni: &#x2264;0.02%, S: &#x2264;0.001%, P: &#x2264;0.001%, and the rest being Fe and unavoidable impurity elements. The NPR steel material for rock bolt and the production method thereof effectively solve the problem that rock bolts in the prior art have low tensile strength and low effective elongation. The NPR steel material for rock bolt has a yield strength adjustable in the range of 500-1100 MPa, and an elongation adjustable in the range of 10-80%.

NPR steel material for rock bolt and production method thereof

A hoisting apparatus for a mine vertical shaft, a hoisting system for a mine vertical shaft and a controlling method thereof are provided. The hoisting apparatus includes a driving device provided at a wellhead and a guiding device provided in a vertical shaft. A position of the guiding device corresponds to a position of the driving device and a transmission rope is wound around the driving device and the guiding device. Moreover, the driving device is drivingly connected to the guiding device via the transmission rope; and a tension regulating device is provided in the vertical shaft. The guiding device is movably provided at the tension regulating device that is for regulating a distance between the driving device and the guiding device. The tension regulating device controls a tension of the transmission rope by regulating the distance between the driving device and the guiding device.

Mine vertical shaftlifting apparatus, mine vertical shaft lifting system and control method therefor

An experimental system for simulating creep and stick-slip dislocations of a fault in a tunnel structure includes a box structure, a supporting device and a fault dislocation loading system. A friction effect layer, a first surrounding rock layer, a tunnel structure model, a second surrounding rock layer and an overburden pressure layer are sequentially arranged in the box structure from bottom to top. The bottom of the box structure is provided with a through hole. A plate assembly is provided on the through hole, and includes a first guide plate, a second guide plate and a loading plate. Inner sides of the first guide plate and the second guide plate are respectively provided with a first slide rail and a second slide rail. The loading plate moves along the first slide rail and the second slide rail under the action of the fault dislocation loading system.

Experimental system for simulating creep and stick-slip dislocations of fault in tunnel structure

Growing community of inventors

Beijing, China

Manchao He