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Development of Soft Computing-based Predictive Tools for Estimating the Young Modulus of Weak Rocks

Köken Ekin, Strzałkowski Paweł

Civil and Environmental Engineering Reports

2024

Vol. 34, no. 3

182--193

The deformation characteristics of rocks are of vital importance in addressing most geomechanical issues as they are one of the most critical input parameters in rock engineering analyses. For this reason, robust forecasting models are required when analysing the stability of tunnels, slopes, mine galleries, and other underground excavations. In this research, novel predictive models are proposed to estimate the tangential Young modulus (Eti) of weak rocks. To achieve this, an extensive literature review is performed to obtain a comprehensive database including critical physico-mechanical properties of various weak rocks. Thanks to the advantages of soft computing methods such as genetic algorithm (GA), adaptive neuro-fuzzy inference system (ANFIS), artificial neural networks (ANN) and multivariate adaptive regression splines (MARS), novel predictive models are established. The effectiveness of the developed predictive models is investigated using various statistical measures and it is concluded that empirical models utilizing ANN and ANFIS methodologies are the most effective tools for estimating the Eti of weak rocks. In addition, a practical design chart is also developed for assessing the Eti of weak rocks.

Monitorowanie procesu deformacji górotworu z wykorzystaniem termodynamicznej metody pomiarowej

Grzebyk W., Stolecki L.

Budownictwo Górnicze i Tunelowe

2011

nr 3

5-11

W artykule przedstawiono wyniki pomiarów testowanej, nowej metody pomiarowej monitorującej proces deformacji masywu skalnego. Zrealizowane badania polegały na rejestracji parametrów termodynamicznych fazy gazowej górotworu stanowiących podstawę do wnioskowania o przebiegu procesu deformacji. Zgodnie z przyjętymi założeniami testowanej metody, pomiary były realizowane w otworach wiertniczych, gdzie rejestrowano zmiany ciśnienia medium gazowego w uszczelnionej części otworu oraz zmiany ciśnienia oleju w zbiorniku sondy uszczelniającej otwór. Dodatkowo wykonano pomiary wilgotności i temperatury medium gazowego.

The article presents the results of tested, new measurement method monitoring the process of rock mass deformation. The accomplished investigations consisted in recording of thermodynamic parameters of the gaseous state of the rock mass constituting a basis for concluding of the course of deformation process. According to the assumptions of the tested method, the measurements were taken in boreholes, where the changes in gas medium were recorded in a sealed part of the borehole and changes in oil pressure in the tank of a probe sealing the boreholes. In addition, measurements of humidity and temperature of the gas medium have been carried out.