我國位處西太平洋地震帶，地震相當頻繁。對於地下結構物周圍的岩盤而言，在受地震引起之反覆作用力，以及地下隧道或橋樑基樁等設置於泥岩岩盤而因交通所產生震動，對岩盤穩定性的影響是值得探討的課題。為瞭解泥岩的力學特性有更進一步研究的必要性。本研究進行一系列靜、動態力學試驗來探討在不同應力狀態下之依時行為等特性，探討泥岩受到外在環境及地震力之動態荷重作用後是否對其力學行為有所影響。
為獲得古亭坑層泥岩的破壞強度曲面，本研究進行一系列的三軸試驗，試驗圍壓之大小從5MPa至120MPa，所獲得之試驗成果明顯看出古亭坑泥岩在圍壓達35MPa時，其應力－應變曲線將進入應變硬化。現有破壞準則的適用性在探討，結果顯示Hoek and Brown破壞準則、Adachi and Ogawa 破壞準則和Kim and Lade model三模式的模擬皆能獲得較佳的成果。此外，根據靜態三軸潛變試驗之應變速率和時間的關係可知潛變的減速階段的硬化參數λ值為0.728，其幾乎不受荷重的增加或圍壓的改變的影響。而反覆荷重試驗所獲得的之潛變的減速階段的硬化參數λ為0.721，其結果和靜態潛變試驗相近似，顯示此值為此材料的一種特性值。
反覆荷重試驗的結果顯示頻率對泥岩的變形、剪力強度模數、是否產生破壞等影響較為明顯，在本研究的實驗設定之下，在相同應力比及振幅的條件下，頻率越快變形量越小，試體較不易破壞。其原因在於較快頻率下會使得剪力強度模數增加，所作用於試體上的能量較低，阻尼比相對較小。因此，泥岩在高頻率的反覆應力作用下，較不易破壞，故對於高頻的震動具有較佳的抵抗力。

Taiwan is located at the boundary of tectonic plates. The great tectonic force causes frequent earthquake on the island. It is essential to investigate the impacts of earthquakes acting on the mudstone rock mass adjoining to the underground structure and the traffic vibrations applid to the mudstone through foundation to the stability of the rock mass. In order to understand above case, the mechanical properties of mudstone is needed to proceed further studies. In this study, a series of static and dynamic tests were conducted to explore the different state of stress and time dependent behavior, to confer the mudstone by the external environment and the dynamic load of the earthquake after it has affected their mechanical behavior.
The tri-axial compressive tests were conducted with different confining pressures ranged from 5 to 120 MPa to obtain the failure surface of Gutingkeng mudstone. The test results identify that the stress-strain curve behaves to be strain hardening when the confining pressure exceeds 35 MPa. Additionally, the analysis show that Adachi and Ogawa failure criteria and the Kim and Lade model correlate well with the test results. However, Adachi and Ogawa failure criteria overestimates the brittle-ductile transition pressure of the mudstone. In addition, in static triaxial creep tests, the strain hardening parameters λ is 0.728, and is independent from the loading and confining pressure. While, the λ obtained from cyclic loading tests is 0.721, which is very close to the one of static creep tests.
Cyclic loading test results show that the frequency governs the deformation, shear modulus, and the failure of Gutingkeng mudstone. With the same stress ratio and loading amplitude, the deformation of mudstone decreases with the increasing loading frequency. The fast frequency will increase the shear modulus, indicating that the mudstone specimen are loaded in low energy, and small damping ration. Therefore, the Gutingkeng mudstone has good resistance under the impacts of high frequency vibrations.

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