Directory of Open Access Books (DOAB)
R. M. Evans (Pastor, Welsh Congregational Church of Big Rock, Illinois),
... R. M. (Pastor, Welsh Congregational Church of Big Rock, Illinois). Application for aid: Big Rock, Illinois, July 25, 1857.
1857 - Gale Group | SAS Part 1
Bingjun Sun, Yu‐chun Mei, Weiteng Li, Changan Zhang, Xing Shao, Tingchun Li, Wen-xu Li, Wen-xin Zhao, Luping Wang,
The existence of jointed rock masses in tunnels is a key problem that leads to the deformation and instability of the surrounding rock. Based on the engineering background of the Qingdao ... mechanism of deformation and instability of the surrounding rock of a jointed tunnel using model blocks that ... growth stage. After the axial force of the rock bolt suddenly decreases in the loading stage, the ... finally, S-shaped failure occurs when the surrounding rock is unstable. Under the action of a prestressed ...
Tópico(s): Landslides and related hazards
2024 - Elsevier BV | Engineering Failure Analysis
... Vail; March 28, 1848 to Mr. Lewis Tappan; Rock Praire, Rock County, Wisconsin.
1848 - Gale Group | SAS Part 1
Mohatsim Mahetaji, Jwngsar Brahma,
Understanding rock failure behaviors is crucial for various engineering applications, including geotechnical engineering, mining, petroleum engineering, and underground construction. Rock failure criteria provide essential tools for the prediction of mechanical response of rocks under different loading conditions. This review article overviews various rock failure criteria, highlighting their underlying theories, modeling approaches, ... Criteria, as well as more advanced criteria incorporating rock fabric, anisotropy, and complex failure modes. The review ...
Tópico(s): Tunneling and
2024 - Elsevier BV | Engineering Failure Analysis
Directory of Open Access Journals (DOAJ)
... Fourth Year of Kansei (1792), and a Rare Rock Called "Osugata Iwa" Stands in the Background. The Rock Is Seen in the Center of the Photo ...
0000 - Gale Group | NCCO Photography
Yujing Jiang, Bin Liang, Dong Wang, Hengjie Luan, Guangchao Zhang, Ling Dong, Lugen Chen,
... investigate the failure mechanical properties of deep soft rock–coal combinations when subjected to dynamic disturbance. Hence, ... on samples of muddy sandstone, coal, and soft rock–coal combinations using a creep disturbance dynamic impact ... This study analyzed the damage properties of soft rock–coal combinations under dynamic disturbance by combining sample ... strength and modulus of elasticity of the soft rock–coal combinations under uniaxial compression and dynamic disturbance are intermediate between those of coal and rock. The strength deterioration effect of the rock–coal ...
Tópico(s): Landslides and related hazards
2024 - Elsevier BV | Engineering Failure Analysis
... Geological Arch Formed by Erosion. The Layered Sedimentary Rock of This Island Teaches Us Much about the ...
0000 - Gale Group | NCCO Photography
Kun Du, Xiyao Luo, Minghui Liu, Xiling Liu, Jian Zhou,
... investigate the crack evolution and failure mechanism of rocks by conducting uniaxial compression tests (UCT) and Brazilian indirect tension tests (BITT) using four categories of rock specimens. Real-time acoustic emission (AE) signals were detected and recorded during rock failure processes by an AE monitoring system. The ... the stress thresholds. Furthermore, the transition trend of rock crack types was analyzed based on RA-AF ... proposed, and the crack boundaries of the four rocks were determined. Additionally, the tension to shear ratios ...
Tópico(s): Tunneling and
2024 - Elsevier BV | Engineering Fracture Mechanics
Springer Link
Picture Postcard of Tateiwa Rock on the Coast near Mogi. Mogi Was a Popular Resort among Foreigners. The Prefectural Highway Opened in 1885 and the ...
0000 - Gale Group | NCCO Photography
Baoping Zou, Jiahao Yin, Zhiping Liu, Xu Long,
... characterized by moderate karst formations, that include soft rock layers above and harder rock beneath, shield tunneling poses significant risks, including cutterhead ... profound understanding of the dynamic mechanical responses that rock bodies exhibit during tunnel construction. This study adopted ... apply different impact pressures to three groups of rock bodies using the cutter model. The major objective ... to investigate the dynamic mechanical behavior of the rock under up to 20 successive impacts by shield ...
Tópico(s):
2024 - Elsevier BV | Tunnelling and Underground Space Technology
Picture Postcard of Tateiwa Rock on the Coast near Mogi, Taken from a Angle Different to #5265. Mogi Was a Popular Resort among Foreigners. The ...
0000 - Gale Group | NCCO Photography
Jinshuai Zhao, Shuqian Duan, Bingrui Chen, Lei Li, Chengxiang Yang, Pengxiang Li, Guofeng Liu,
... and accurate identification of the failure mechanism of rock masses is of great significance for achieving a ... capture the excavation-induced microfracture signals of intact rock masses and rock masses with weak interlayer zones (WIZs). To clarify the mechanical mechanisms controlling the surrounding rock failure modes, the moment tensor inversion method is ... mechanism solutions (strike, dip and rake) of the rock masses. The spatial distribution of the MS events shows that the excavation-induced microfractures of intact rock masses are concentrated in the working face of ...
Tópico(s): Dam Engineering and Safety
2024 - Elsevier BV | Soil Dynamics and Earthquake Engineering
Springer Link
Sullivan, John L. (John Langdon), Disbrow, Levi,
... be deposed to promote the formation of a rock-water company, with banking privileges, either by approval ...
0000 - Gale Group | Sabin June 2012
Yuhe Cai, Yankun Ma, Teng Teng, Yi Xue, Linchao Wang, Zhengzheng Cao, Zhizhen Zhang,
Rock burst, an important kind of geological disaster, often occurs in underground construction. Rock burst risk assessment, as an important part of ... productivity. It involves injecting liquid nitrogen into reservoir rocks to induce fractures and increase permeability, effectively reducing rock burst occurrences and facilitating the flow of oil or gas toward the wellbore. The research on rock burst risk assessment technology is the basis of reducing rock burst geological disasters, which has important theoretical and ...
Tópico(s): Geotechnical and Geomechanical Engineering
2024 - Multidisciplinary Digital Publishing Institute | Water
Includes bibliographical references. Book.
0000 - Gale Group | Sabin
Shengwen Qi, Songfeng Guo, Muhammad Faisal Waqar, Guangming Luo, Shishu Zhang,
... the classification and prediction of severity for brittle rock failure, focusing on failure behaviors and excessive determination ... surveys and previous studies, four types of brittle rock failure with different failure mechanisms are classified, and ... method incorporates two variables, i.e. Kv (modified rock mass integrity coefficient) and GSI (geological strength index). ... Station. The results show that the predicted brittle rock failure area agrees with the actual failure area, ... s applicability. Next, it extends to investigate brittle rock failure in two locations. The first is the ...
Tópico(s): Geotechnical Engineering and Analysis
2024 - Elsevier BV | Journal of Rock Mechanics and Geotechnical Engineering
Signed (p. 14): I.O. Wilkinson [and 9 others], committee. Book.
0000 - Gale Group | Sabin
Jianhang Chen, Wenbo Zhang, Junming Ma, Banquan Zeng, Yu Huang,
Rock anchors are widely used in rock reinforcement in civil engineering. However, little analytical research has been performed to investigate the anchoring performance of rock anchors when the grout and rock are simultaneously considered. This manuscript proposed an innovative mechanical model for rock anchors when grout flutes and rocks are considered simultaneously. Grout flutes and rocks were combined together to constitute the surrounding system. ...
Tópico(s):
2024 - Elsevier BV | Engineering Failure Analysis
Yun Zhang, Liang Tong, Xingping Lai, Shenggen Cao, Baoxu Yan, Yanbin Yang, Yongzi Liu, Wei He,
Abstract Coal-rock interface identification technology was pivotal in automatically adjusting the shearer’s cutting drum during coal mining. However, it ... to address the poor accuracy of current coal-rock identification technology on comprehensive working faces, coupled with the limited availability of coal-rock datasets. The loss function of the SegFormer model ... an automatic recognition method was proposed for coal-rock interfaces based on FL-SegFormer. Additionally, an experimental ... constructed to simulate the dusty environment during coal-rock cutting by the shearer, enabling the collection of ...
Tópico(s): Drilling and Well Engineering
2024 - Springer International Publishing | International Journal of Coal Science & Technology