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單壓下砂岩微觀變形與機制研究 = A preliminary study...

國立高雄大學土木與環境工程學系碩士班

單壓下砂岩微觀變形與機制研究 = A preliminary study of micro-deformation and mechanism of sandstone through uniaxial tests

Record Type:	Language materials, printed : monographic
Paralel Title:	A preliminary study of micro-deformation and mechanism of sandstone through uniaxial tests
Author:	黃耀增,
Secondary Intellectual Responsibility:	國立高雄大學
Place of Publication:	[高雄市]
Published:	撰者;
Year of Publication:	2008[民97]
Description:	133面圖，表 : 30公分;
Subject:	木山層砂岩
Subject:	weak sandstone
Online resource:	http://handle.ncl.edu.tw/11296/ndltd/59784417516327748792
Notes:	指導教授：翁孟嘉
Notes:	參考書目：面117-120
Summary:	台灣西部的麓山帶其地質年代年輕，以未變質的第三世紀砂岩為主。此類砂岩由於成岩作用時間短，大部分強度都不高且膠結及壓密程度都不佳，在遇水後有強度大幅度弱化的傾向，所以很多大型建設在遭遇到此類岩層時，常常產生一些施工災害。若從微觀的角度觀察，影響砂岩力學特性主要是在顆粒跟基質這兩部份，且進入微觀的角度後，在釐清顆粒與基質的受力與應變上的難度就增加許多。本研究係以木山層砂岩、大寮層砂岩為研究對象。對乾燥及含水兩種狀態下之岩石試體，利用萬能材料試驗機進行單壓試驗，並透過數位影像相關係數法進行分析。試驗結果顯示：研究中採用之木山層砂岩與大寮層砂岩都有遇水後強度弱化的現象。分析結果顯示：乾燥時，基質受到的軸向應變、剪應變都較顆粒大，但在砂岩遇水後，顆粒與基質受到的軸向應變、體積應變以及剪應變都會增大，且可看到顆粒與基質應變大小相近。而就變形模數來看，隨著應力增大，割線模數有硬化的趨勢，可以看到在同樣的strength ratio情形下，乾燥試體的割線模數比含水試體來的大，且顆粒的割線模數比基質大；切線模數的部份則是乾燥試體的切線模數大於含水試體。 This study explores the mechanism associated with the characteristics of the weak sandstone from micro-vision. Firstly, uniaxial tests with tiny specimens are conducted and the photographs of deformation could be obtained simultaneously using microscope. Then, the digital image correlation (DIC) technique is used to effectively measure the whole strain field in micro-vision. According to the analysis results, the deformation of weak sandstone possesses the following characteristics: (1) when specimens are dry, axial strain and shear strain of matrix are larger than those of grain; when specimens are wet, the strain of grain and matrix are very close; (2) deducing from stress-strain curves, the secant modulus and tangent modulus of each specimens can be obtained, and the secant modulus of grain are higher than that of matrix when specimens are dry, and the tangent modulus exhibits similar tendency.

單壓下砂岩微觀變形與機制研究 = A preliminary study of micro-deformation and mechanism of sandstone through uniaxial tests
黃, 耀增

單壓下砂岩微觀變形與機制研究 = A preliminary study of micro-deformation and mechanism of sandstone through uniaxial tests / 黃耀增撰 - [高雄市] : 撰者, 2008[民97]. - 133面 ; 圖，表 ; 30公分.
指導教授：翁孟嘉參考書目：面117-120.
木山層砂岩weak sandstone

單壓下砂岩微觀變形與機制研究 = A preliminary study of micro-deformation and mechanism of sandstone through uniaxial tests
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330 $a 台灣西部的麓山帶其地質年代年輕，以未變質的第三世紀砂岩為主。此類砂岩由於成岩作用時間短，大部分強度都不高且膠結及壓密程度都不佳，在遇水後有強度大幅度弱化的傾向，所以很多大型建設在遭遇到此類岩層時，常常產生一些施工災害。若從微觀的角度觀察，影響砂岩力學特性主要是在顆粒跟基質這兩部份，且進入微觀的角度後，在釐清顆粒與基質的受力與應變上的難度就增加許多。本研究係以木山層砂岩、大寮層砂岩為研究對象。對乾燥及含水兩種狀態下之岩石試體，利用萬能材料試驗機進行單壓試驗，並透過數位影像相關係數法進行分析。試驗結果顯示：研究中採用之木山層砂岩與大寮層砂岩都有遇水後強度弱化的現象。分析結果顯示：乾燥時，基質受到的軸向應變、剪應變都較顆粒大，但在砂岩遇水後，顆粒與基質受到的軸向應變、體積應變以及剪應變都會增大，且可看到顆粒與基質應變大小相近。而就變形模數來看，隨著應力增大，割線模數有硬化的趨勢，可以看到在同樣的strength ratio情形下，乾燥試體的割線模數比含水試體來的大，且顆粒的割線模數比基質大；切線模數的部份則是乾燥試體的切線模數大於含水試體。 This study explores the mechanism associated with the characteristics of the weak sandstone from micro-vision. Firstly, uniaxial tests with tiny specimens are conducted and the photographs of deformation could be obtained simultaneously using microscope. Then, the digital image correlation (DIC) technique is used to effectively measure the whole strain field in micro-vision. According to the analysis results, the deformation of weak sandstone possesses the following characteristics: (1) when specimens are dry, axial strain and shear strain of matrix are larger than those of grain; when specimens are wet, the strain of grain and matrix are very close; (2) deducing from stress-strain curves, the secant modulus and tangent modulus of each specimens can be obtained, and the secant modulus of grain are higher than that of matrix when specimens are dry, and the tangent modulus exhibits similar tendency.
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