大理岩與蛇紋岩人工乾溼循環過程力學特性與微組構變化探討

Variation of Mechanical and Microstructural Characteristics of Marble and Serpentinite under Man-made Dried-wetted-cycling Process

郭雅雯(Ya-Wen Guo) ； 許珮筠(Pei-Yun Shu) ； 邱俊誠(Chun-Cheng Chiu) ； 王泰典(Tai-Tien Wang) ； 翁祖炘(Tzuu-Hsing Ueng)

《臺灣鑛業》 65卷4期 (2013/12) Pp. 48-60

摘要

本文以大理岩與蛇紋岩為對象，透過人工乾濕風化循環試驗，探求風化過程岩石指數、微觀組構及力學特性之變化，建立岩石風化程度與力學特性變化的關係。研究結果獲知：大理岩於循環過程中，因方解石溶解導致晶粒間黏結力下降，岩石材料隨風化程度增加而明顯地弱軟化，抗風化能力的變異程度亦增加。而蛇紋岩於循環過程中，發生礦物溶解及相轉變作用；溶解作用造成岩石材料弱軟化，相轉變形成的石英則有助於晶粒間之黏結，因此循環過程中抗風化能力及力學特性略顯週期性變化現象，且在本文實驗循環次數下，整體呈現微幅上升的趨勢。

關鍵字

大理岩 ； 蛇紋岩 ； 一般指數 ； 微觀組構 ； 力學特性

並列摘要

Focusing on marble and serpentinite, this study aims to investigate the variation of generally physical indices, microstructure, and mechanical properties of the rocks under man-made dried-wetted-cycling process. Experimental results reveal that the calcite mineral of marble dissolves during artificial weathering cycles and leads to descending of grain contact degrees. Intact rock strength and deformability of marble reduces as cycling number increases, but the variation of weathering resistance increases. For serpentinite, mineral dissolution and phase transition are observed during artificial weathering. Mineral dissolution results in rock softening of the rock. However the quartz formed from phase transition is helpful for the bonding between grain contacts. During cycling process both the weathering resistance and mechanical properties have insignificant period and limited increasing trends.

並列關鍵字

marble ； serpentinite ； generally physical indices ； microstructure ； mechanical properties