Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/95907
標題: 反覆增減孔隙水壓對土壤行為的影響
The effects of cyclic changes of pore water pressure on soil behavior
作者: Jui-Kai Liao
廖睿凱
關鍵字: triaxial test;pore water pressure;creep;三軸試驗;孔隙水壓;潛變
引用: 1. Chang, K. T.* and Huang, H. C. (2015). 'Three-dimensional analysis of a deep-seated landslide in central Taiwan.', Environmental Earth Sciences, 74(2), 1379-1390. 2. Eigenbrod K.D. (1993). 'Downslope movements at shallow depths related to cyclic pore-pressure changes.', Can. Geotech. J. , 30, pp. 464-475 3. Petley, D. N., & Allison, R. J. (1997). The mechanics of deep‐seated landslides. Earth surface processes and landforms, 22(8), 747-758. 4. Sawicki, A., Mierczyński, J., & Świdziński, W. (2013). 'Apparent creep of saturated sand caused by intrinsic cyclic loading.', Journal of Geotechnical and Geoenvironmental Engineering, 140(2),06013002-3. 5. Take, W. A., & Bolton, M. D. (2011). 'Seasonal ratcheting and softening in clay slopes, leading tofirst-time failure.', Géotechnique, 61(9), 757-769. 6. Wood, D.M. (1990). 'Soil behavior and critical state soil mechanics(1).', the United States, Cambridge University Press.
摘要: 
The purpose of this study is to change the pore water pressure in triaxial tests, simulate that underground soil behavior affected by the changes of ground water table. We conducted triaxial tests with sinusoidal cyclic changes of pore pressure in fixed deviator stress. The soil behavior in this situation is similar to creep behavior. We observed how this behavior affected the soil.
Non-cohesive and cohesive soils are tested. The test results show that the behavior of non-cohesive soil is slightly affected by the cyclic changes of pore pressure. Cohesive soil is weakened due to the times of pore pressure cyclic changes, and would probably be failed in the deviator stress under the monotonic loading strength.
The controlled deviator stress of pore pressure cyclic changes divides the soil behavior into two parts: failure-able and stable. The boundary between two kinds of soil behavior is the soil residual strength. When the controlled deviator stress is larger than the soil residual strength, the soil is failure-able by the cyclic changes of pore pressure. When the controlled deviator stress is less than the soil residual strength, the effects of pore pressure cyclic changes are restricted.

本研究以三軸試驗的孔隙水壓變化,模擬地面下的土體受地下水位變化產生的土壤行為,我們在三軸試驗中途固定軸差應力並反覆增減孔隙水壓,使土壤產生類似潛變的行為,觀察此行為對土壤的影響。
  材料上分別對無凝聚性與凝聚性土壤進行試驗。結果顯示無凝聚性土壤行為受孔隙水壓反覆增減行為影響有限。凝聚性土壤會隨反覆增減孔隙水壓循環次數增加而強度弱化,最後可能在低於單調荷重強度下的軸差應力產生破壞。
  凝聚性土壤根據反覆增減孔隙水壓時固定軸差應力的大小產生穩定與可破壞兩種行為。兩種行為以土壤殘餘強度為分界,當固定軸差應力大於土壤殘餘強度,土壤能藉由反覆增減孔隙水壓破壞。固定軸差應力小於土壤殘餘強度,反覆增減孔隙水壓影響有極限。
URI: http://hdl.handle.net/11455/95907
Rights: 同意授權瀏覽/列印電子全文服務,2018-02-09起公開。
Appears in Collections:水土保持學系

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