Recommended symbols for engineering geological mapping report by the IAEG Commission on Engineering Geological Mapping

Matula, M.

doi:10.1007/bf02595272

Cited by 35 publications

(2 citation statements)

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“…Thus, the range of degrees of weathering of the stone relics was divided into 10 levels numbered from 1 to 10, based on the longitudinal ultrasonic velocity [13,15]. The weathering level (L T ) was defined as follows:…”

Section: Weathering Levelmentioning

confidence: 99%

“…1c) were tested using a nondestructive ultrasonic machine, and the corresponding ultrasonic velocities were calculated. It has been referenced from the Engineering Geologic Mapping Committee of the International Engineering Geology Association and the Laboratory and Site Standard Committee of the International Rock Mechanics Association [13], the longitudinal ultrasonic velocity ratios of the weathered and fresh rocks represent the weathering levels of rocks in the Yungang Grottoes, as well as the classification of the weathering degrees for materials such as marble and granite [14][15][16]. Next, the terahertz (THz) spectra of the weathering samples in the study area were measured using a terahertz time-domain spectrum system (THz-TDS).…”

Section: Introductionmentioning

confidence: 99%

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A synthetic approach to weathering degree classification of stone relics case study of the Yungang Grottoes

Meng

Zhao

et al. 2018

Herit Sci

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Classification of the weathering degree of large outdoor stone relics has long been a challenge in their protection engineering. An approach to classifying the weathering levels of the Yungang Grottoes is presented in this paper. This approach is based on combined terahertz (THz) spectra and ultrasonic velocity and the use of a least squares support vector machine (LS-SVM). A regression model for prediction of the weathering level was established using the optimal values of parameters determined by the double cross-validation (D-CV) method. This SVM regression prediction model (SVMRPM) predicts the weathering levels of the grottoes with relative errors of 8.16% or less. The SVMRPM can also be used to predict the weathering levels of some areas where ultrasonic testing is extremely difficult; the THz spectra can easily be obtained using approximately 0.2 g of sample material. This method is a highly efficient and economical technique for determining the degree of weathering of large exposed stone relics.

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Section: Weathering Levelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%