Results 31 to 40 of about 273,199 (309)

Estimating the rock mass deformation modulus: A comparative study of empirical methods based on 48 rock mass scenarios

REM: International Engineering Journal, 2021
The rock mass deformation modulus, Erm, is an input parameter for most numerical modeling to verify the deformation behavior of rocks due to rock engineering activities within/on it. Among the most common methodologies used for estimating this parameter,
Konstantinos Polemis Júnior, Francisco Chagas da Silva Filho, Francisco Pinheiro Lima-Filho   +2 more
doaj   +1 more source

Fundamental Study on Support Systemat Cibaliung Underground Gold Mine, Indonesia [PDF]

Geotechnical information is a key for underground design. The most important parameters are rock mass strength, geological structures, main stress and strain, rock mass classification, discontinuities, etc.
Funatsu, Takahiro, Purwanto, Sasaoka, Takashi, Shimada, Hideki, Trisetyo, Bambang, Wattimena, Ridho   +5 more
core   +1 more source

Use of Rock Mass Rating (RMR) values for support designs of tunnels excavated in soft rocks without squeezing problem [PDF]

, 2019
Effect of the rock material strength on the RMR value and tunnel support designs were investigated within this study including site works, analytical and numerical analyses.
Demir, Serhat, Komurlu, Eren
core   +1 more source

Intelligent Identification of Surrounding Rock Grades Based on a Self-Developed Rock Drilling Test System

Buildings
The classification of surrounding rock is crucial for formulating safe tunnel construction plans and support measures. However, the complex geological environment of tunnels presents a challenge in obtaining accurate drilling parameters for rock mass ...
Quanwei Liu, Junlong Yan, Hongzhao Li, Peiyuan Zhang, Yankai Liu, Linsheng Liu, Shoujie Ye, Haitao Liu   +7 more
doaj   +1 more source

Engineering Classification of Jointed Rock Mass Based on Connectional Expectation: A Case Study for Songta Dam Site, China

Advances in Civil Engineering, 2020
Engineering classification of complex jointed rock mass is influenced and controlled by many factors with random, nonlinear, and unascertained characteristics, which is an extremely complicated problem.
Shengyuan Song, Qiang Xu, Jianping Chen, Wen Zhang, Chen Cao, Yongchao Li   +5 more
doaj   +1 more source

Towards TBM Automation: On-The-Fly Characterization and Classification of Ground Conditions Ahead of a TBM Using Data-Driven Approach

Applied Sciences, 2021
Pre-tunneling exploration for rock mass classification is a common practice in tunneling projects. This study proposes a data-driven approach that allows for rock mass classification. Two machine learning (ML) classification models, namely random forest (
Sylvanus Sebbeh-Newton, Prosper E.A. Ayawah, Jessica W.A. Azure, Azupuri G.A. Kaba, Fauziah Ahmad, Zurinahni Zainol, Hareyani Zabidi   +6 more
doaj   +1 more source

Alternative models for the calculation of the RMR and Q indexes for granite rock masses [PDF]

, 2007
Empirical classification systems like the RMR and Q are often used in current practice of geotechnical structures design built in rock masses. They allow obtaining an overall description of the rock mass and the calculation, through analytical ...
Correia, A. Gomes, Cortez, Paulo, Miranda, Tiago F. S., Nogueira, I., Santos, Manuel Filipe, Sousa, L. R.   +5 more
core   +1 more source

Rock Mass Structure Classification of Caves Based on the 3D Rock Block Index

Applied Sciences
In large-scale water conservancy and hydropower projects, complex rock structures are considered to be the main factor controlling the stability of hydraulic structures.
Jun Dong, Qingqing Chen, Guangxiang Yuan, Kaiyan Xie   +3 more
doaj   +1 more source

Modification of rock mass rating system: Interbedding of strong and weak rock layers

Journal of Rock Mechanics and Geotechnical Engineering, 2017
Rock mass classification systems are the very important part for underground projects and rock mass rating (RMR) is one of the most commonly applied classification systems in numerous civil and mining projects.
Mohammad Mohammadi, Mohammad Farouq Hossaini   +1 more
doaj   +1 more source

Clinical Insights Into Hypercalcemia of Malignancy in Childhood

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Hypercalcemia of malignancy (HCM) is a rare but life‐threatening metabolic emergency in children that occurs in less than 1% of pediatric cancer cases, with a reported incidence ranging from 0.4% to 1.0% across different studies. While it is observed in 10%–20% of adult malignancies, pediatric HCM remains relatively uncommon.
Hüseyin Anıl Korkmaz
wiley   +1 more source