臺灣博碩士論文加值系統

由於台灣區塊多屬於造山帶，地層的活動頻率甚繁，導致地層構造非常複雜且地層容易產生破碎帶，岩盤中常有許多的不連續面、弱面(如裂隙、斷層、層面、劈理)。岩體存在的不連續面或弱面，這些通稱為節理面(Joints)，這些節理面是地層發生破壞的主要因素。如岩石順向坡易沿著節理面滑落，或在隧道中因節理面造成岩塊掉落。
岩層與岩層間的接合力是較弱的，尤其是砂、頁岩交互疊層，其因透水性等因素會影響岩體，對於岩體的重量與岩面的摩擦力產生影響，進而對整體岩層產生變化，如下滑或崩坍等現象。
為了減少這些現象的發生，並能在岩層受破壞前，先預估可能受影響的岩體範圍與會產生破壞的時機。讓多屬於造山帶的台灣地區，對於岩體設計上能更加完善，也更加安全，所以需要在節理面上多做調查與研究。
含節理面岩層之剪動行為過去已有甚多學者從事研究，對夾泥節理岩石之剪動行為也多有探討，然而對夾泥含水量之影響則甚少有學者研究。本文主要針對夾泥厚度與含水量對節理岩石之剪力行為，作深入探討。此外，也對地震引起之反覆剪力作用，也就節理岩石在反覆剪力作用下之剪力行為進行研究，並提出剪力強度之評估方式。

The shear behavior of rock joints have normally been investigated in the past by conducting conventional direct shear test in the laboratory, where during the shearing process, the effect of infill material is often neglected.
It is well known that the shear strength of rock joints decreases significantly due to the presence of gauge on infill materials. In addition, the joint strength is highly dependent on the shear behavior of infill material and joint asperity during shear movement. Though many researches have been done about the influence of infill material and asperity on joint shear strength, however, only a limited number of studies are found in relation to the influences of infill thickness and water content on the shear strength of infilled rock joints. The current study is an attempt to investigate the shear behavior of soft rock joints under Constant Normal Load(CNL) conditions, with special reference to the influences of infill thickness and moisture content on shear behavior of planar and rough joints. The results of this study show that infill water content could influence shear strength of planar and rough rock joints, more significantlier than infill thickness.
In addition, laboratory cyclic shear tests were conducted for three joint types under three different normal stresses. Asperity degradation, and shear strength of joints were found to be a function of joint roughness, normal stress, shearing displacement and number of loading cycles. Based on the experimental results, mathematical models were developed for evaluation of shear strength in cyclic loading conditions. Comparison of the test results with that of the proposed model, it is found a good agreement is observed.

摘 要 ⅰ
ABSTACT ⅱ
謝 誌 ⅳ
TABLE OF CONTENTS ⅴ
LIST OF TABLES ⅶ
LIST OF FIGURES ⅷ
LIST OF PHOTOS ⅸ
CHAPTER 1 Introduction 1
1.1 General Remarks 1
1.2 Organization 4
CHAPTER 2 Literature Review 5
2.1 Shear behavior of infilled planar joints 5
2.2 Shear behavior of infilled rough joints 7
2.2.1 Factors affecting the shear strength of infilled rock joints 8
2.2.2 Laboratory Investigation 12
2.2.3 Summary of previous studies 12
2.3 Behavior of rough joints under cyclic shearing 16
2.3.1 Joint asperity degradation during cyclic shear 17
2.3.2 Cyclic shear strength of rock joints 19
CHAPTER 3 Effect of Infill Thickness and Moisture Content on Shear Behavior of Planar Joints 21
3.1 Introduction 21
3.2 Apparatus and test metod 23
3.3 Test Results and discussions 25
CHAPTER 4 Effect of Infill Moisture Content and Thickness on Shear Behavior of Rough Rock Joints 30
4.1 Introduction 30
4.2 Apparatus and test method 32
4.3 Test results and discussions 35
CHAPTER 5 Behavior of Rough Joints Under Cyclic Shearing 49
5.1 Introduction 49
5.2 Apparatus and test method 50
5.3 Experimental results 53
5.4 Mathematical model of cyclic shear strength 59
CHAPTER 6 Conclusions 70
References 72

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