以UDEC模擬互層材料之力學行為; Numerical study of mechanical properties on interlayered material by using UDEC

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题名:	以UDEC模擬互層材料之力學行為;Numerical study of mechanical properties on interlayered material by using UDEC
作者:	盧育辰;Yu-Chen Lu
贡献者:	土木工程研究所
关键词:	破壞準則;互層地層;人造互層岩體;UDEC;UDEC;artificial interlayered rock;interlayered formation;failure criteria
日期:	2009-07-10
上传时间:	2009-09-18 17:26:35 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	互層材料具有異質性及異向性之力學性質，故在實驗或理論分析及研究較一般均質或等向性之大地材料複雜許多。互層材料之工程性質與力學行為主要受到互層岩體節理之強度與變形行為影響，顯示出互層材料的強度和變形性與節理勁度和層面方向性有直接的關係。本研究將採取以分離元素法及顯性有限差分法為理論基礎所發展之Universal Distinct Element Code 3.0（簡稱UDEC 3.0）做為分析工具，對互層材料進行無圍壓縮、三軸試驗與地層承載力試驗之模擬。藉由選定之模型，進行模擬試驗之力學行為與破壞模態研究。研究結果顯示，以UDEC模擬人造互層岩體於較高圍壓下之三軸試驗，其模擬結果與實驗數據有相當程度之落差，原因在於UDEC無法順利模擬出較軟弱的模型材料B會「被貫入（penetrated）」到模型材料A之張力裂縫內之情形。另外，利用UDEC模擬人造互層岩體的破壞模態方面，其模擬結果與實驗結果相當符合。此外，本文以UDEC模擬互層地層承載力試驗，發現到UDEC模擬互層地層之承載力與互層傾角之關係，會呈現出類似於橫向等向性材料的強度特性（波動型或U型的強度特性），與蘇正中（2002）利用FLAC分析傾斜層狀地層之承載力會隨著角度增加而增加有所不同。原因在於本文利用UDEC進行互層地層分析時，考慮到層面參數的影響，與蘇正中（2002）利用FLAC分析沒有考慮到層面因素影響而有所差異。 The mechanical behaviors of interlayered materials are much more complicated than that of isotropic materials. In fact, these mechanical behaviors are subjected to joints of rock mass or discontinuities of materials. The Universal Distinct Element Code version 3.0 (UDEC 3.0) is adopted in this study to simulate uniaxial compressive tests, triaxial compressive tests and bearing capacity tests on interlayered materials. The UDEC simulations of uniaxial compressive tests and triaxial compressive tests analysis are in accordance with the experiment data of failure modes. But UDEC can not simulate and analyze the situation that material B (weaker material) is penetrated into tensile cracks of material A (more brittle and stronger material) in higher confining pressures very well. That’s the reason why predicted strength will be different from experimental data. In Su’s (2002) study, analyzing with FLAC, it showed that the correlation between bearing capacity and orientation angle is a positive relation. But in this study, the UDEC simulation results of analyzing bearing capacity tests show that the correlation between bearing capacity and orientation angles is more likely the strength behaviors (U type or undulatory type) of transversely isotropic materials. The difference between this study and Su (2002) study is, this study considers the influence of joint parameters, but Su (2002) study does not.
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