Results 51 to 60 of about 60,050 (341)

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

Geological occurrence and productivity prediction for coalbed methane of central Hunan depression, China

Frontiers in Earth Science, 2022
To analyze the geological occurrence and predict the drainage performance of coalbed methane in the central Hunan depression of China, coal samples were collected to conduct physical experiments and numerical simulations.
Ningbo Cai, Ningbo Cai, Ningbo Cai, Keying Wang, Keying Wang, Jiang Du, Jiang Du   +6 more
doaj   +1 more source

Technical Guidance Sheet (TGS) on normal levels of contaminants in English soils : copper (Cu) : technical guidance sheet supplementary information TGS03s, July 2012 [PDF]

, 2012
Both the NSI (XRFS) and G-BASE data sets are derived from a soil sample that has been aggregated (composited) from a number of subsamples collected over the area of a site, rather than a single point sample.

core  

Study on the failure mechanism of the shield excavation face in the sandy cobble stratum under different buried depths

Deep Underground Science and Engineering, EarlyView.
Abstract One of the significant challenges faced in shield tunnel construction is the risk of collapse resulting from abrupt changes in soil conditions in advance of the working face, particularly within the sandy cobble stratum. This study aims to effectively manage these sudden variations and to further investigate the failure mechanisms associated ...
Hua Jiang, Chongyang Liu, Ao Zhang, Xiaoyan Zhang, Yuhang Li   +4 more
wiley   +1 more source

GSUE: urban geochemical mapping in Great Britain [PDF]

, 2005
The British Geological Survey is responsible for the national strategic geochemical survey of Great Britain. As part of this programme, the Geochemical Surveys of Urban Environments (GSUE) project was initiated in 1992 and to date, 21 cities have been ...
Ander, E.L., Breward, N., Brown, S.E., Fordyce, F.M., Johnson, C.C., Lister, T.R., O'Donnell, K.E., Rawlins, B.G.   +7 more
core   +2 more sources

Effect of confining pressure on fracture characteristics and mineralogical behavior of tight sandstone specimens after hydraulic fracturing

Deep Underground Science and Engineering, EarlyView.
Hydraulic fracturing in tight sandstone and fracture propagation characteristics using backscattered electron‐scanning electron microscope (BSE‐SEM) images. Abstract This study focuses on hydraulic fracturing experiments conducted under triaxial conditions on tight sandstone specimens from Shivpuri district, Madhya Pradesh, India.
Pankaj Rawat, Narendra Kumar Samadhiya
wiley   +1 more source

Korelasi Antara Batuan Induk dan Minyak Bumi Berdasarkan Analisis Geokimia Hidrokarbon Pada Sumur Luk-2, Sub-cekungan Jambi, Cekungan Sumatera Selatan [PDF]

, 2017
Kegiatan eksplorasi hidrokarbon saat ini semakin meningkat seiring dengan meningkatknya kebutuhan energi di Indonesia. Sub-cekungan Jambi, Cekungan Sumatera Selatan memiliki sumur-sumur tua yang ditinggalkan, namun beberapa juga masih berproduksi dalam ...
Kurniasih, Anis, Nugroho, Hadi, Rahmah, Lukluk Mahya   +2 more
core  

Optimization of cut‐hole layout under high in situ stress based on numerical simulation and field tests

Deep Underground Science and Engineering, EarlyView.
This study investigates the blast‐induced rock damage patterns under different cut‐hole layouts and ground stress conditions through numerical simulations and field tests. The findings in this study provide valuable insights for similar underground engineering applications.
Junjie Zhao, Diyuan Li, P. G. Ranjith, Xinxin Lü, Yanliang Li, Xiaoli Su   +5 more
wiley   +1 more source

Normal background concentrations of contaminants in the soils of England : available data and data exploration [PDF]

, 2011
This draft report describes the completed Work Package 1 and 2 tasks of the Defra commissioned Science and Research Project SP1008 - Establishing data on normal/background levels of soil contamination in England.
Ander, E.L., Cave, M.R., Johnson, C.C., Palumbo-Roe, B.   +3 more
core  

Rockburst prediction based on data preprocessing and hyperband‐RNN‐DNN

Deep Underground Science and Engineering, EarlyView.
A data preprocessing workflow is proposed to address challenges in rockburst data analysis. Coupled algorithms preprocess the data set, and hyperband optimization is used to enhance RNN performance. Results show that preprocessing improves accuracy, while dense layers enhance model stability and prediction performance.
Yong Fan, Chenxi Yin, Guangdong Yang, Shengyong Ding, Bin Tian   +4 more
wiley   +1 more source