HYBRID FINITE-DISCRETE ELEMENT MODELLING OF ROCK FRACTURE DURING CONVENTIONAL COMPRESSIVE AND TENSILE STRENGTH TESTS UNDER QUASI-STATIC AND DYNAMIC LOADING CONDITIONS

HUAMING AN; HONGYUAN LIU; HAOYU HAN

doi:10.1590/1679-78256123

HYBRID FINITE-DISCRETE ELEMENT MODELLING OF ROCK FRACTURE DURING CONVENTIONAL COMPRESSIVE AND TENSILE STRENGTH TESTS UNDER QUASI-STATIC AND DYNAMIC LOADING CONDITIONS

Authors

HUAMING AN FACULTY OF PUBLIC SECURITY AND EMERGENCY MANAGEMENT, KUNMING UNIVERSITY OF SCIENCE AND TECHNOLOGY, KUNMING 650093, CHINA HTTPS://ORCID.ORG/0000-0003-2254-2276
HONGYUAN LIU SCHOOL OF ENGINEERING AND ICT, UNIVERSITY OF TASMANIA, TAS 7001, AUSTRALIA HTTPS://ORCID.ORG/0000-0002-5437-4695
HAOYU HAN SCHOOL OF ENGINEERING AND ICT, UNIVERSITY OF TASMANIA, TAS 7001, AUSTRALIA HTTPS://ORCID.ORG/0000-0002-7369-5187

DOI:

https://doi.org/10.1590/1679-78256123

Abstract

A HYBRID FINITE-DISCRETE ELEMENT METHOD IS PROPOSED TO MODEL THE ROCK FRACTURE UNDER STATIC AND DYNAMIC LOADING. THE KEY COMPONENT OF THE HYBRID FINITE-DISCRETE ELEMENT METHOD, I.E. TRANSITION FROM CONTINUUM TO DISCONTINUUM THROUGH FRACTURE AND FRAGMENTATION, WHICH MAKES THE HYBRID METHOD SUPERIOR TO THE TRADITIONAL CONTINUUM-BASED FINITE ELEMENT METHOD AND DISCONTINUUM-BASED DISCRETE ELEMENT METHOD, IS INTRODUCED IN DETAIL. AN EMPIRICAL RELATIONSHIP BETWEEN THE STATIC STRENGTHS AND THE DYNAMIC STRENGTHS DERIVED FROM THE DYNAMIC ROCK FRACTURE EXPERIMENTS IS IMPLEMENTED IN THE HYBRID METHOD TO MODEL THE EFFECT OF THE LOADING RATE. THE HYBRID METHOD HAS WELL MODELLED THE ROCK FRACTURE PROCESSES IN BRAZILIAN TENSILE STRENGTH (BTS) TEST AND UNIAXIAL COMPRESSIVE STRENGTH (UCS) TEST UNDER QUASI-STATIC LOADING. THE OBTAIN ROCK FRACTURES PATTERNS SHOW GOOD AGREEMENTS WITH THE EXPERIMENTAL RESULTS AND THE OBTAINED FORCE LOADING-DISPLACEMENT CURVES INDICATE A TYPICAL FAILURE PROCESS OF BRITTLE MATERIALS. THE HYBRID METHOD HAS MODELLED THE PURE MODE-I, PURE MODE-II AND MIXED-MODE I-II FRACTURE PROCESS AND THE OBTAINED FRACTURE TOUGHNESS USING DIFFERENT TEST METHODS SHOW A GOOD AGREEMENT WITH EACH OTHER. THEN THE HYBRID METHOD IS EMPLOYED TO MODEL THE DYNAMIC ROCK FRACTURE PROCESS IN UCS AND BTS TESTS. THE PROPOSED METHOD HAS WELL MODELLED THE DYNAMIC ROCK FRACTURE AND FRAGMENTATION PROCESSES AND CAPTURED THE EFFECT OF LOADING RATE ON ROCK STRENGTHS. IT IS CONCLUDED THAT THE HYBRID FINITE-DISCRETE ELEMENT IS A VALUABLE TOOL TO STUDY THE DYNAMIC ROCK FRACTURE AS IT TAKES THE ADVANTAGES OF THE CONTINUUM-BASED FINITE ELEMENT METHOD AND DISCONTINUUM-BASED DISCRETE ELEMENT METHOD, AND CONSIDER THE EFFECT OF THE LOADING RATE.

Downloads

Published

2020-08-07

Issue

Vol. 17 No. 6 (2020)

Section

Articles

License

Authors who publish with this journal agree to the following terms:

Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License [CC BY] that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).