異向性小應變三軸試驗儀之研發｜國立臺灣科技大學博碩士論文系統

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研究生：	鄧福宸 Fu-Chen Teng
論文名稱：	異向性小應變三軸試驗儀之研發 The development of small strain anisotropic triaxial testing system
指導教授：	歐章煜 Chang-Yu Ou
口試委員:	林宏達 Hung-Da Lin 簡紹琦 Shao-Chi Chien
學位類別：	碩士 Master
系所名稱：	工程學院 - 營建工程系 Department of Civil and Construction Engineering
論文出版年：	2005
畢業學年度：	94
語文別：	英文
論文頁數：	90
中文關鍵詞：	小應變、異向性、三軸試驗
外文關鍵詞：	small strain, anisotripic, triaxial
相關次數：	點閱：188 下載：19
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近年來許多文獻研究顯示，於小應變量下，土壤之力學行為對土壤及結構互制問題之分析有極重要的影響。本研究基於此目的，致力於發展一套具有進行極小應變力學試驗能力之試驗系統。於此系統中，採用最新加載設備。以精密軸向應力、應變控制達到小應變試驗之目的。軸向傳導裝置應用高精密、零背隙滾珠螺桿，避免於軸向位移傳遞過程中發生誤差。並研發數位壓力控制器，提供準確之壓力來源。另外於設計概念上，克服並改善操作便利性，大量使用圖像式人機介面，使試驗系統單純化。最後，運用新一代LabVIEW程式撰寫試驗系統，提供一多功能平台，使所有使用者依其特殊目的而增加或修改試驗系統。

According to many research results in last few decades, the soil properties at small strain is an important factor of analyzing the geotechnical engineering problems. For that purpose, the testing system able to perform small-strain tests must be set up. In order to bring out the soil properties realistically, the testing system should be as precise as possible. Therefore, there is a whole new triaxial testing system introduced in this research.
The new testing system designed in this study is separated into three major parts, i.e. loading system, pressure control system, and data acquisition system. The loading system is consisted of a high-performance servo motor and extreme precise ball screw. And the attainable minimum axial displacement is dependent on the performance of the loading system. Besides the accurate control of axial load and displacement, the pressure source is quite important too. The pressure source in this testing system is two digital pressure controller designed and manufactured in Taiwan. The digital pressure controller could provide steady and continuous pressure for all tests. At last, the sensors used in measuring all changes of the specimen are very sensitive and the DAQ devices have exceedingly high resolution.
Furthermore, the testing program is programmed in LabVIEW—the new and versatile program. It provides a convenient way for users to modify the testing program to meet their needs. The small strain anisotropic triaxial testing system could give fine investigation for soil properties under very small strain.

Contents
Chinese abstract........................................................................................................I
English abstract........................................................................................................II
Acknowledgement..................................................................................................III
Contents....................................................................................................................IV
List of tables...........................................................................................................VII
List of figures........................................................................................................VIII
CHAPTER 1 INTRODUCTION..........................................................................1
1 Background..................................................................................................1
2 Objective......................................................................................................1
3 Structure.......................................................................................................2
CHAPTER 2 THE MEASUREMENTS IN TRIAXIAL
TEST APPARTUS.........................................................................4
1 Strain measurement in triaxial test...............................................................4
1.1 Errors in conventional triaxial test apparatus....................................4
1.2 Local displacement transducer..........................................................6
1.2.1 Electrolytic liquid levels............................................................6
1.2.2 Hall Effect Semiconductors.......................................................8
1.2.3 Local deformation transducer....................................................9
1.2.4 Proximity transducer..................................................................9
2 The pore pressure measurement in triaxial test..........................................10
2.1 Standard pore pressure transducer-PMP 1400.................................11
2.2 Miniature pore pressure transducer-PDCR81..................................11
3 Load and temperature measurement in triaxial test system.......................13
3.1 Load cell..........................................................................................13
3.2 Temperature transducer...................................................................13
4 The calibration of all sensors......................................................................13
4.1 The calibration for pore pressure transducers.................................14
4.2 The calibration for load cell and temperature transducer................14
4.3 The calibration for Hall Effect semiconductor transducers.............14
CHAPTER 3 PRESSURE CONTROLLER AND
LOADING SYSTEM..................................................................31
1 Pressure control system..............................................................................31
1.1 Mechanical component....................................................................31
1.2 Resolution, functions and operations..............................................32
2 Loading System..........................................................................................33
2.1 The Bishop & Wesley 1975.............................................................34
2.2 The modified commercial triaxial testing system from Italy...........36
2.3 The triaxial testing system from University of Tokyo.....................37
2.4 The loading system of small-strain
triaxial testing system in NTUST...................................................38
2.4.1 The determination of the maximum
torque capacity of motor...........................................................38
2.4.2 The type of motor and determination of transmission.............39
2.4.3 The performance of the loading system...................................41
2.4.4 The motion-control device.......................................................41
CHAPTER 4 THE TRIAXIAL TESTING PROGRAM...............................51
1 The Data Acquisition System.....................................................................51
1.1 Transducers......................................................................................52
1.2 Signals.............................................................................................52
1.2.1 Analog signal information........................................................52
1.2.2 Digital signal information........................................................53
1.3 Signal conditioning.........................................................................54
1.3.1 Amplification............................................................................54
1.3.2 Filtering....................................................................................54
1.3.3 Anti-aliasing filters...................................................................55
1.3.4 Other types of signal conditioning...........................................56
1.4 DAQ device.....................................................................................57
1.5 Driver level and application level software.....................................57
2 The Testing Programs.................................................................................58
2.1 K0 consolidation..............................................................................58
2.2 Shearing stage.................................................................................60
2.3 Sub-VIs...........................................................................................61
CHAPTER 5 THE RESULTS OF DEVELOPMENT..................................71
1 Development Results of Hardware.............................................................71
2 Development Results of Software..............................................................72
3 Comparison between Different Testing Systems.......................................72
CHAPTER 6 CONCLUSIONS AND SUGGESTIONS..............................86
1 Conclusions................................................................................................86
1.1 Specifics..........................................................................................87
1.2 Functions.........................................................................................87
2 Suggestions.................................................................................................88
References.................................................................................................................89

                                

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