Results 31 to 40 of about 1,488 (167)

Stability Control of a Roadway Surrounding Rock during the Cutting and Pressure Relief of a Coal-Bearing Roof at a Shallow Mining Depth

Geofluids, 2022
Recent years have seen the widespread use of a new gob-side entry retaining technology, namely, automatic roadway forming based on roof cutting and pressure relief.
Chen Tian, Yingjie Liu, Hezhuang Lou, Tinggui Jia   +3 more
doaj   +1 more source

Treatment of Developmental Dysplasia of the Acetabulum by Hip Arthroscopic Acetabuloplasty Combined With Labral Repair, Cam and Pincer Osteoplasty, Collagen‐Induced Autologous Chondroplasty, and Capsule Suture

Arthroscopy Techniques, EarlyView.
Abstract Developmental hip dysplasia due to insufficient acetabular coverage and excessive pressure on the femoral head can easily lead to labral tears, damage to the labrum–cartilage junction, cam and pincer deformities, and joint capsule laxity. This may ultimately result in osteoarthritis.
Dongdong Zhou, Jin Zhang, Zhe Xue, Zhengwei Zhu, Shihao Yang, Deding Liu, Xinyue Zhang, Ceyong Sun   +7 more
wiley   +1 more source

Multiple injection techniques to stimulate complex fracture networks in coal reservoirs: A case study on gas disaster reduction of subsurface coal mine in southwest China

Deep Underground Science and Engineering, EarlyView.
An experimental device for physical simulation of hydraulic fracturing, comprising: a load‐bearing mechanism with multiple interconnected plates that collectively form an sample chamber; a load‐generating mechanisms, with multiple load‐generating mechanisms arranged within the experimental chamber.
Delei Shang, Farui Shi, Jun Lu, Minghui Li, Cunbao Li, Heping Xie   +5 more
wiley   +1 more source

Study on Key Parameters of Roof Cutting and Surrounding Rock Control Technology for Gob-Side Entry Retaining in Fully Mechanized Top Coal Caving Mining of Thick Coal Seams

Applied Sciences
In thick coal seam conditions, the surrounding rock deformation in the longwall mining faces’ along-the-goal roadway is severe, and the support strength struggles to meet roadway retention requirements.
Menglong Zha, Chong Li, Yadong Zheng, Huan Xia, Menghu Sun, Shuaishuai Jiang   +5 more
doaj   +1 more source

Strengthening urban resilience in China through underground infrastructures management: Addressing global climate challenges with technological solutions

Deep Underground Science and Engineering, EarlyView.
This paper explores how climate‐resilient technologies, such as smart grids, digital twins, and self‐healing materials, can enhance urban resilience. It highlights the urgent need for proactive planning, public‐private collaboration, and data‐driven innovation to future‐proof underground infrastructure amid accelerating climate and urban pressures ...
Kai Chen Goh, Tonni Agustiono Kurniawan, Christia Meidiana, Abdelkader Anouzla, Faissal Aziz, Imran Ali, Joan Cecilia C. Casila, M. Imran Khan, Dongdong Zhang, Meihui Jiang, Mohd Hafiz Dzarfan Othman, Md Munir Hayet Khan, Kasun Kumara Dissanayake   +12 more
wiley   +1 more source

Study on Key Parameters of Hard Roof Cutting and Pressure Release and Roadway Retaining in Medium Thick Coal Seam

Meikuang Anquan, 2020
Based on the engineering geological conditions of the hard roof of the medium thick coal seam in Dadougou Coal Mine, in order to implement the non-pillar mining technology of roof cutting and pressure release, the key parameters of roof cutting and ...
LIU Dajiang, XU Xuhui, ZHU Hengzhong, OUYANG Feng
doaj   +1 more source

Advancing mine pillar design: Evaluating traditional methods and integrating AI for enhanced stability of pillars in the Great Dyke, Zimbabwe

Deep Underground Science and Engineering, EarlyView.
B1 is bord width 1, B2 is bord width 2, L is the pillar length, W is the pillar width, red color and letter A represent the pillars, and white color and number 1 represent excavated areas. Pstress is the average pillar stress; σv is the vertical component of the virgin stress, MPa; and e is the areal extraction ratio. e = B o B o + B P ${\rm{e}}=\frac{{
Tawanda Zvarivadza, Hendrik Grobler, Peter Apata Olubambi, Moshood Onifade, Manoj Khandelwal   +4 more
wiley   +1 more source

Width of small coal pillars and control of pressure relief by roof cutting in roadway excavation along goaf under thick coal seam

Gong-kuang zidonghua
The reservation of small coal pillars in roadway excavation along goaf under deep mining conditions of thick coal seams is an effective way to reduce resource loss caused by wide coal pillar protection.
LIU Peng, WEI Jinkai
doaj   +1 more source

Feasibility Study on Roof Cutting and Pressure Relief Technology of Gob-side Wall Retaining in Large Mining Height Working Face

Meikuang Anquan, 2020
To solve the problem of large deformation of concrete wall caused by large bearing capacity of gob-side wall retaining in large mining height working face, the concrete bearing structure of gob-side brick retaining was determined for the site conditions
SHEN Hao, ZHANG Baisheng, HE Xin
doaj   +1 more source

Mechanism and disaster control new technology of strong ground pressure manifestation in ultra‐large mining face

Deep Underground Science and Engineering, EarlyView.
In response to the problem of strong mining pressure manifestation along the goaf roadway in a thick coal seam mining area, this study uses a new type of combined blasting roof cutting technology to effectively control the manifestation and deformation of mining pressure along the goaf roadway.
Xiaoding Xu, Manchao He, Jun Yang, Yubing Gao, Qiang Fu, Qing Ma, Yajun Wang   +6 more
wiley   +1 more source