高溫作用後長枝坑層砂岩之力學性質研究

A Study of the Mechanical Properties of Changzhikeng Layer Sandstone after High Thermal Action

郭俊志(C. C Kuo) ； 張群和(C. H Chang) ； 謝其泰(C. T. Hsieh) ； 王建力(C. L. Wang)

《臺灣鑛業》 67卷4期 (2015/12) Pp. 27-32

摘要

由於歐亞板塊與菲律賓板塊組合而成臺灣島，隨著資源開發、能源應用等工程技術發展，有越來越多工程問題必須要考慮到地層壓力及地溫梯度的影響。例如高山深隧道開挖，地下資源儲存、地熱資源開發等。在升高的溫度和壓力下岩體內部會有各種晶體結構及微裂紋分布上的差異，而造成岩石的力學特性受溫度及壓力的影響極其複雜。故本文探討高岩覆砂岩受高溫作用後其力學性質上之差異性。本研究之砂岩試體取自曾文越域東引水隧道長枝坑層。實驗結果顯示，隨著溫度升高，砂岩之尖峰應力，彈性模數、泊松比降低。砂岩外觀顏色、體積及微裂隙的增生亦可解釋內部孔隙率的增加，其中通過600℃的高溫後岩石之各項變化漸為明顯。可以證明溫度引起的熱應力作用和岩石內部微結構變化是影響砂岩力學性質產生變化的原因。

關鍵字

熱效應 ； 砂岩 ； 力學性質

並列摘要

Base on the combination of the Eurasia and Philippine plate forms the Taiwan Island. Engineering projects such as deep tunnel under high mountain may involve site condition of great depth underground. As depth at considered site increases, both the underground temperature and pressure tend to elevate. This study investigated the mechanical properties of sandstones under various thermal effects. Both the thermal cracking test under high temperature and the uniaxial compression test have been carried out in this study. On the thermal cracking test and uniaxial compression tests sandstone samples were repeated one times at temperature of 25℃, 200℃, 400℃, 600℃, 800℃, 1,000℃, respectively. The mechanical properties including elastic modulus and poisson's ratio at high temperature. The experimental results show that the changes of volume, density, and appearance caused by high temperature of 600℃ are the most significant. Higher temperature lends to increase in the peak stress and peak strain while decrease in elastic modulus and poisson's ratio.

並列關鍵字

thermal effects ； sandstones ； mechanical properties