MICROPROPERTIES EFFECTS AND SYSTEMATIC EVALUTION METHOD ON MESOSCALE MECHANICAL PROPERTIES OF ROCK MATERIALS

影響岩石介觀力學參數的顯著微觀參數暨系統性選擇參數的方法

10.6652/JoCICHE.202304_35(2).0010

Pei-Yun Shu(許珮筠)；Tai-Tien Wang(王泰典)；Hung-Hui Li(李宏輝)

microproperties ； mesoscale mechanical parameters ； PFC2D ； design of experiment ； 微觀特性 ； 介觀力學參數 ； 顆粒流程式 ； 實驗設計法

中國土木水利工程學刊

35卷2期（2023 / 04 / 01）

211 - 224

英文;繁體中文

The aim of this paper is to investigate the effects of microproperties on mesoscale mechanical parameters of rock materials using particle flow code (PFC). A new approach has been devised to reveal significant microproperties on mesoscale mechanical parameters using design of experiment (DOE) and orthogonal arrays in PFC simulation. The effects of microproperties with respect to uniaxial compressive strength (UCS), Brazilian tensile strength (BTS), Young's modulus (E_(50)), Poisson's ratio (v), strength ratio (UCS/BTS), and modulus ratio (E_(50)/UCS) were carried out by the statistical analysis of variance (ANOVA). The results of analyses reveal that primary factors and their interactions that affect the mesoscale mechanical parameters are different. Three regression equations from the following ranges: UCS (4.26 ~ 71.11 MPa), BTS (0.30 ~ 11.39 MPa), and E_(50) (1.26 ~ 23.75 GPa) are proposed to capture the relationship between the UCS, BTS and E_(50) of a specimen and its significant microproperties. A flow chart for the efficient determination of a rock microproperties using PFC2D is also suggested in this paper.

本研究探討顆粒流程式微觀參數與其模擬所得介觀力學特性關係，利用實驗設計法搭配直交表進行因子配置，透過PFC模擬獲得單軸壓縮強度、巴西抗張強度、楊氏模數、及泊松比，並計算獲得模數比與強度比，據以進行變異數分析，釐清不同微觀參數及其間的交互作用對於模擬所得介觀力學特性的影響。研究結果顯示，影響試體介觀力學參數的主要顯著微觀參數及交互作用項各不相同。本研究建立試體介觀力學參數與微觀參數的複迴歸關係式，據以提出一套決定微觀參數的系統方法，對於單壓強度介於4.26～71.11 MPa、巴西抗張強度0.30～11.39 MPa、楊氏模數1.26～23.75 GPa的試體，可以提供快速有效選擇微觀參數的依循。

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