Results 31 to 40 of about 28,555 (287)

Probability prediction of true‐triaxial compressive strength of intact rocks based on the improved PSO‐RVM model

Deep Underground Science and Engineering, EarlyView.
In this work, we propose an improved particle swarm optimization (PSO) algorithm and develop an improved PSO‐relevance vector machine (RVM) model as a substitute for traditional true‐triaxial testing. The model's high prediction accuracy was validated through comparisons with two other machine learning methods and five three‐dimensional Hoek–Brown type
Qi Zhang, Maohui Wang, Ning Wang, Yixin Shen, Xuzhen He   +4 more
wiley   +1 more source

Microstructure analysis and mechanical parameter estimation of sanding dolomite

Frontiers in Earth Science
Sanding dolomite strata are widely distributed in southwest China. The safety of the water diversion tunnel in Yuxi section of the Central Yunnan water diversion Project has been seriously threatened by the geological disasters such as the reduction of ...
Fengnian Wang, Fengnian Wang, Fengnian Wang, Fengnian Wang, Zewei Li, Zewei Li, Yongxiang Shi, Yongxiang Shi, Xiaowen Gong, Yanjie Zhang   +9 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

Petrography of Jutana Dolomite: Implications for Geotechnical Utility [PDF]

International Journal of Economic and Environment Geology, 2018
Present study has been carried out to know the reliance of mechanical properties on the petrographic parameters. The Jutana dolomite is comprised of dolomite, sandy dolomite and siliciclastic beds.
Mustafa Yar, Umer Jabbar Khan, Mian Gulzeb Joya, Muhammad Saqib Javed   +3 more
doaj  

Lacustrine dolomite in deep time: What really matters in early dolomite formation and accumulation? [PDF]

, 2023
Lacustrine dolomite has received considerable attention during the last twenty years due to its scientific and high economic value in conventional and unconventional hydrocarbon reservoirs.
Wen, Huaguo, Li, Changzhi, Sánchez-Román, Mónica; id_orcid, Pei Guo, Mónica Sánchez-Román, Huaguo Wen, Hailong He, Changzhi Li, Guo, Pei, He, Hailong   +9 more
core   +1 more source

A rock brittleness index based on the postpeak energy release rate and damage surface characteristics for brittle hard rock

Deep Underground Science and Engineering, EarlyView.
This study examines energy evolution in rock rupture via triaxial direct shear tests, exploring the impact of confining pressure and temperature on fracture surface randomness. A novel energy‐based brittleness index is proposed, validated experimentally, and compared with existing methods for reliability and accuracy.
Biao Wang, Zaobao Liu, Jing Xue, Bo Lu, Wei Zeng, Dengke Zhang   +5 more
wiley   +1 more source

Petrology and geochemical characteristics of dolomite in the Middle Permian Maoukou Formation, central Sichuan

Petroleum Research, 2017
Dolomites of the Maokou Formation in the central Sichuan were mainly developed in the middle-upper part of Member 2 and the lower part of Member 3 of Maokou Formation, it could be divided into fine-to medium-grained calcareous dolomite, fine-to medium ...
Jianqiang Liu, Haofu Zheng, Bo Liu, Hongguang Liu, Kaibo Shi, Rongtao Guo, Xuefeng Zhang   +6 more
doaj   +1 more source

Dolomite rich coral reef coralline algae resist dissolution in acidified conditions [PDF]

, 2012
Coral reef ecosystems develop best in high-flow environments but their fragile frameworks are also vulnerable to high wave energy. Wave-resistant algal rims, predominantly made up of the crustose coralline algae (CCA) Porolithon onkodes and P ...
J Prichard (8006888), Nash, Merinda, Kline, David I, Diaz-Pulido, G., Kline, D. I., M. Gardner, M Gardner (8006885), Nash, MC, Adey, Walter H., Nash, Merinda C., U Troitzsch (8006873), Merinda C Nash (8006870), Troitzsch, U., G. Diaz-pulido, Prichard, J, Troitzsch, Ulrike, Gardner, Michael George, Kato, A., Russell, BD, Nash, Merinda C, B. D. Russell, Kato, A, J. Prichard, Russell, B.D., Gardner, M., Gardner, Madelene, Russell, Bayden D., Russell, B., Nash, M., Kline, David, W. H. Adey, Adey, W.H., A Kato (8006879), Brent, C, W H Adey (8006876), Bradley N Opdyke (6970697), Opdyke, B., M. C. Nash, Adey, WH, Kline, D., Opdyke, Bradley, Adey, W., Opdyke, Bradley N., David I Kline (7915490), Nash, M. C., Bayden D Russell (7966148), Adey, W H, Brent, C., Adey, W. H., D. I. Kline, C. Brent, Russell, B. D., Diaz-Pulido, Guillermo, Prichard, Jennifer, Russell, Bayden D, Kline, DI, Troitzsch, U, U. Troitzsch, Opdyke, BN, B. N. Opdyke, C Brent (8006882), Gardner, M, Brent, Camilla, Diaz-Pulido, Guillermo A., Kline, David I., Prichard, J., Opdyke, B. N., Guillermo Diaz-Pulido (7915493), Diaz-Pulido, G, Opdyke, Bradley N, A. Kato   +70 more
core   +1 more source

Numerical and experimental study on P‐wave propagation across a rock joint with different orientations

Deep Underground Science and Engineering, EarlyView.
Joint orientation significantly affects P‐wave velocity, with the highest velocity at zero‐degree angles, decreasing to 30° as the angle increases. The velocity increases slightly from 30 to 45 degrees but sharply decreases from 45 to 90 degrees. Abstract Determination of the required parameters in different science contexts using the ultrasonic wave ...
Yaghoob Zarei, Mojtaba D. fallahi, Ali Uromeihy, Mohammad R. Nikoodel, Mohammad Fathollahy   +4 more
wiley   +1 more source

Origin of the dolomite in the Buqu Formation (Mid-Jurassic) in the south depression of the Qiangtang Basin, Tibet: Evidence from petrographic and geochemical constraints

Frontiers in Earth Science, 2022
The Qiangtang Mesozoic sedimentary basin is a new field of hydrocarbon exploration, in which the Buqu Formation dolostone reservoirs have attracted increasing attention in recent years.
Youli Wan, Youli Wan, Jiashan Lin, Jiashan Lin, Zhan Zhao, Zhan Zhao, Zhonglin Wang, Zhonglin Wang   +7 more
doaj   +1 more source