标题: 細顆粒對砂土性質之影響:儀器之研發與實驗程序之設定
Effects of Fines on the Behavior of Sands: Developement of Testing Equipment and Experimental Procedures
作者: 許世平
Shi-Pin Hsu
黃安斌
An-Bin Huang
土木工程學系
关键字: 細顆粒;膨脹性;收縮性;fines;dilatant;contractive
公开日期: 1993
摘要: 由經驗得知當砂土中含有細顆粒時,其工程性質與均勻級配之砂土有很大
不同。在相等的相對密度下,均勻級配的砂土可能是膨脹性 (dilatant)
,如有細顆粒則可變成收縮性 (contractive)。細顆粒對現場土壤試驗,
比如錐貫入試驗也有很大的影響。數值模擬顯示砂土中之細小的顆粒在受
圓錐貫入試驗的影響下所受的應力(stress)要比大顆粒高。我們對於細顆
粒如何影響砂土之工程性質所知有限。為了進一步了解細小顆粒對砂土性
質之影響,我們展開一系列的研究,包括用不連續變形法之數值模擬與實
驗室中之砂土實驗。本論文所敘述的研究是有關砂土實驗方面啟始的工作
。研究的主要目的是︰研發一套多功能之土壤實驗裝置以滿足未來實驗所
需、建立實驗所用砂土的基本資料及確立砂土實驗之方法與程序和檢測實
驗方法與程序之可行性與重複性。論文報告多功能之土實驗裝置之研發,
砂土實驗過程與現有的實驗結果。
Experience has indicated that the engineering properties of a
graded sand with fines are significantly different from those
of a uniform sand. Under a given relative density , a uniform
sand could be dilatant while a graded sand with fines could be
contractive. Fines can influence the results of in-situ tests
such as the cone penetration tests. Numerical simulations ,
show that finer particles tend to experience higher stress
induced by the penetration of a cone. There is a lack of
fundamental understanding as to how the fines affect the
behavior of a granular material. A series of research
activities were initiated to enhance our understanding related
to the effects of fines on the behavior of sands. These
activities include numerical simulations using
Discontinuous Deformation Analysis (DDA) method ,and laboratory
experiments on sands. The objectives of the research are
:development of a multiple purpose soil testing apparatus to
meet the need of future research work , establish basic
engineering properties , testing method and procedures for the
sand to be used in the future , and evaluate the feasibility
and repeatability of the testing procedure. The thesis
describes details of the multiple purpose soil testing
apparatus , and results of preliminary experiments.
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT820015053
http://hdl.handle.net/11536/57573
显示于类别:Thesis