不同排水條件下高嶺土的速度相依摩擦特性及溫度測量;Velocity-dependent frictional properties of kaolinite clay under different drainage conditions with temperature measurement

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Title:	不同排水條件下高嶺土的速度相依摩擦特性及溫度測量;Velocity-dependent frictional properties of kaolinite clay under different drainage conditions with temperature measurement
Authors:	潘克頁;Viet, Pham Quoc
Contributors:	應用地質研究所
Keywords:	旋剪試驗;高嶺土;Rotary shear test;kaolinite
Date:	2019-01-22
Issue Date:	2019-04-02 15:13:31 (UTC+8)
Publisher:	國立中央大學
Abstract:	大量研究表明，地滑的滑移速度會顯著地影響滑移帶的強度。此外，根據有效應力原理，滑移帶中因滑移而產生的孔隙壓力被認為是抗剪強度的主導因素。然而，關於此過程有效記錄的研究仍然很少。本研究旨在探討滑移速度、排水條件和溫度對高嶺土強度的影響，利用低速-高速旋剪儀以1MPa之正向應力、〖10〗^(-7)~1m/s之滑移速度，對濕高嶺土進行旋剪試驗，並量測視摩擦係數。排水條件由不同的圍岩類型控制，包括徑向排水和單排水條件。在實驗期間通過熱電偶直接測量剪切面上的溫度。實驗結果顯示，濕高嶺土的視摩擦係數μ明顯低於乾燥高嶺土的視摩擦係數μ。對濕的試體而言，由於含水量差異，使用相對不具滲透性的圍岩（RD系列）所進行剪切的試體之穩態摩擦係數略高於使用具滲透性的圍岩（SD系列）進行剪切之試體的之穩態摩擦係數。RD系列之實驗結果顯示，視穩態摩擦係數相對滑移速度的關係為先強化在弱化，與乾燥試體之結果相似。視穩態摩擦係數在速度強化之後，又迅速降低，與測量得到的溫度變化具有良好的一致性。結果顯示，在不同排水條件下高領土強度與滑移速度具有複雜的相依律。;Numerous researches have suggested that the slip rate of landslides affected the strength of slip zone significantly. Moreover, according to effective stress principal, the pore pressure generating in slip zone due to slip is proposed as a dominating factor for the shear resistance. However, the studies about efficient record on this process is still scarce. This study aims to explore the influence of slip rates, drainage conditions and also temperature on the strength of kaolinite clay. A low to high velocity rotary shear apparatus was used to measure the apparent friction coefficient of wet kaolinite clay under a normal stress of 1 MPa and slip rate ranged from 10-7 to 1 m/s. The drainage conditions are controlled by different holder types including radial drainage and single drainage condition. The temperature on the shear plan is measured directly during the experiment by thermocouple. The experimental results show that the apparent friction coefficient μ of the wet kaolinite clay is significantly lower than that of the dry one. For the wet samples, the μss of clay sheared using relatively impermeable holders (RD series) is somewhat higher than that of the samples sandwiched by permeable holders (SD series) because of the water content difference. Except at 1 m/s, the friction of SD condition becomes higher than RD one, the reason could be the pore pressure generated by thermal pressurization was treated by the permeable holder in SD condition. The apparent steady state friction coefficient μss versus slip rate for the RD series shows a similar strengthening-weakening variation of the dry one. Right after the strengthening, it decreases rapidly, presenting a good consistency with the measured temperature rise. Additional for RD samples, from slip rate of 10-6 m/s, friction coefficient versus slip displacement curves drop and gain again in a short time period is observed in initial stage of test, this could be related to the pore pressure generation/dissipation. The results show the complexity of slip rate dependency strength of kaolinite clay under different drainage conditions.
Appears in Collections:	[Graduate Institute of Applied Geology] Electronic Thesis & Dissertation

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