Results 101 to 110 of about 30,243 (255)

Study on fracture parameter calibration and failure characteristics of rock with hole and crack

Deep Underground Science and Engineering, EarlyView.
The SIF and plastic zone equations for a single hole and crack have been derived. The model's failure state leads to the identification of four types of cracks. The plastic zone increases with increased brittleness and decreased crack length. Abstract Cracks within the surrounding rock of roadways significantly affect their stability and failure ...
Shaochi Peng, Wensong Wang
wiley   +1 more source

Stress sensitivity characteristics of tight sandstone of Xujiahe Formation in southern part of Sichuan Basin

Youqi dizhi yu caishoulu
Tight sandstone reservoirs have poor physical properties and complex pore structures， so hydraulic fracturing technology is usually used to improve the beneficial development of tight sandstone reservoirs.
ZHENG Lingli, WANG Sihui, XIAO Wenlian, YANG Yubin, LI Yuanmin, CHEN Muyao, CHEN Haoyu   +6 more
doaj   +1 more source

Review and prospects of shear test of bolted rock joints

Deep Underground Science and Engineering, EarlyView.
The laboratory shear test equipment, test method, and numerical simulation of bolted rock joints were summarized. The shortcomings and limitations of the current research were analyzed, and the research prospects were proposed. Abstract Rock bolting is a critical approach in geotechnical engineering for supporting weak rocks.
Shulin Ren, Fan Yang, Manchao He, Yong Yuan, Zhigang Tao   +4 more
wiley   +1 more source

Geological features and exploration fields of tight oil in the Cenozoic of western Qaidam Basin, NW China

Petroleum Exploration and Development, 2017
Using a large amount of drilling and experimental analysis data, this paper evaluates four potential fields of tight oil exploration in western Qaidam Basin from comprehensive analysis of geological conditions such as sedimentary environments, source ...
Zhanguo LIU, Chao ZHU, Senming LI, Jianqin XUE, Qingshun GONG, Yanqing WANG, Peng WANG, Zhiyuan XIA, Guangyong SONG   +8 more
doaj   +1 more source

Conservation Assessment for Sword Moss (Bryoxiphidium norvegicum (S.E. Bridel) W. Mitten) [PDF]

, 2002
ID: 8945; issued December 31, 2002INHS Technical Report prepared for USDA, Forest Service Vienna Ranger District Shawnee National ...
Hill, Steven R.
core  

Temperature‐dependent shear behavior and constitutive model of the rock–concrete interface

Deep Underground Science and Engineering, EarlyView.
Shear tests were conducted to investigate the temperature‐dependent shear behavior of the rock–concrete interface, highlighting the interaction between the surrounding rock and the lining during tunnel fires. Under experimental conditions, concrete exhibited greater temperature sensitivity than rock, with the shear fracture surface transitioning from ...
Hongbin Chen, Yujing Jiang, Rui Pan, Bin Wang, Sunhao Zhang, Jinge Zhang, Xianzhuang Ma   +6 more
wiley   +1 more source

Pore structure of tight sandstones with differing permeability: The He 8 Member of the Middle Permian Lower Shihezi Formation, Gaoqiao area, Ordos Basin

Energy Science & Engineering
Tight sandstone has strong pore heterogeneity and complex pore structure, and the pore structure of tight sandstone varies with different permeability.
Dayou Chen, Yushuang Zhu, Wei Wang, Liling Zhang, Jianyun Tang, Jiangli Ren, Yizhe Wang   +6 more
doaj   +1 more source

Shear behavior of bolt–grout interfaces under constant normal stiffness: Influence of grout strength and thickness

Deep Underground Science and Engineering, EarlyView.
The effects of grout strength and thickness on the shear behavior of bolt–grout interfaces (BGI) under constant normal stiffness conditions are investigated. Shear strength, failure modes, and acoustic emission characteristics are examined. The findings reveal that grout strength exerts a significantly greater influence on BGI shear strength and ...
Sunhao Zhang, Dongqi Shang, Yujing Jiang, Jinge Zhang, Hongbin Chen, Tianqi Jiang   +5 more
wiley   +1 more source

The stress sensitivity of permeability in tight oil reservoirs

Energy Exploration & Exploitation, 2019
In the development of tight reservoirs, the permeability of the rock possesses strong stress sensitivity with the dynamic change of formation pressure and effective stress.
Huan Wang, Bingyu Ji, Chengyuan Lv, Liang Zhang, Xiaofeng Li, Can Cui, Hongmin Yu, Jun Nie   +7 more
doaj   +1 more source

Generalized Matsuoka–Nakai criterion considering hydrostatic pressure dependence in the brittle–ductile region

Deep Underground Science and Engineering, EarlyView.
Three sets of strength data were selected, including hydrostatic pressure independent within the brittle region (HPI‐B), hydrostatic pressure dependent within the brittle region (HPD‐B), and hydrostatic pressure dependent within the brittle–ductile region (HPD‐BD). For HPI type, the failure envelope within the deviatoric plane remains constant.
Jiacun Liu, Junjie Xiao, Dongping Liu, Ying Xu   +3 more
wiley   +1 more source