Application of Ultrasonic-Rebound Method in Fast Prediction of Rock Strength
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ORIGINAL PAPER
Application of Ultrasonic-Rebound Method in Fast Prediction of Rock Strength Rui Wang . Xianghui Deng . Yaoyao Meng . Daohong Xia
Received: 1 July 2019 / Accepted: 2 June 2020 Ó Springer Nature Switzerland AG 2020
Abstract Fast and accurate prediction for rock strength of intact rock in underground engineerings is the key to ensure the construction safety. Hence, a test method combing ultrasonic wave and rebound for rock strength is established through the test of rock surface hardness and internal defect. Meanwhile, the ultrasonic-rebound-strength model is built by combining traditional mechanical rebound value and new energy rebound value with rock longitudinal wave velocity test value with the methods of bivariate regression analysis, BP neural network and support vector machine (SVM). It applies the models established in the prediction of gneiss strength prediction and determines the optimal model for ultrasonicrebound strength prediction after analyzing correlation coefficient and relative standard strength deviation. From the prediction results of five test samples, the rock strength prediction model of ultrasonicrebound method obtained from the SVM method reveals the highest accuracy. At the same time, R. Wang X. Deng (&) Y. Meng D. Xia School of Civil and Architecture Engineering, Xi’an Technological University, Xi’an 710021, China e-mail: [email protected] R. Wang e-mail: [email protected] Y. Meng e-mail: [email protected] D. Xia e-mail: [email protected]
according to the strength test results of the test samples, the use of new energy resiliometer can greatly improve the prediction accuracy of rock strength. Keywords Ultrasonic-rebound comprehensive method Regression analysis method BP neural network method Support vector machine method Rock strength prediction
1 Introduction Compressive strength is the most significant indicator in analyzing the mechanical properties of rock mass and the basis for determining the scheme for design and construction of geotechnical engineering. Therefore, fast and accurate determination of compressive strength value of intact rock is of great significance for ensuring the engineering safety and progress. Currently, the most common method for compressive strength test of rock is uniaxial compressive strength test of rock, which poses high requirements for dimension and surface smoothness of test pieces, loading speed and other conditions. Meanwhile, it cannot be implemented in engineering site and this test is destructive. Hence, it has poor timeliness and economy. With the development of modern testing technology, it can obtain the rock strength value rapidly and accurately, without any destruction of
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Geotech Geol Eng
fracture by constructing rock strength prediction model with nondestructive test method in site. This provides a new approach for studying the mechanical properties of rock and solving the actual problems in the engineering. Scholars at home and abroad have done a lo
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