基于细观数值试验的非饱和土石混合体力学特性研究

Abstract
Figure/Table
References
Related Citation (0)

Download: PDF (736 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract The mesoscopic numerical method for simulating unsaturated soil-rock mixture is presented based on its mesostructure features. This method includes the technique for generation of mesostructural model，master-slave contact surface algorithm，and seepage and strength theory of unsaturated soil. The feasibility and rationality of proposed method are validated by comparing the numerical results to the results obtained in laboratory experiments of unsaturated soil-rock mixture. The proposed method is then used to analyze the factors，such as the contact behaviours of soil-rock interface，rock block content and saturation degree，and their influences on the mechanical characteristics and failure mechanism of unsaturated soil-rock mixture. It is found that：(1) Under low confining pressure，unsaturated soil-rock mixture exhibits remarkable shear dilatancy，which are influenced significantly by rock block content and degree of saturation at this time. Under high confining pressure，unsaturated soil-rock mixture exhibits shear contraction. As rock block content increases，the deformation of shear contraction decreases；and the influence of saturation degree is small. (2) The peak strength and deformation modulus of soil-rock mixture increase nonlinearly as the friction coefficient of soil-rock interface increases. When friction coefficient is above 0.6，values of peak strength and deformation modulus tend to be stable. (3) The increase of rock block content will lead to the increases of peak strength and deformation modulus of unsaturated soil-rock mixture. Strain-hardening feature at this time becomes more remarkable. When rock block content exceeds 58%，values of peak strength and deformation modulus tend to be stable. Under low confining pressure，the increase of rock block content will lead to the increase of shear dilatancy deformation. Under high confining pressure，the increase of rock block content will lead to the decrease of shear contraction deformation. (4) The increase of saturation degree will lead to the decrease of matric suction and peak strength of soil-rock mixture but have little influence on deformation modulus.

Key words： soil mechanics unsaturated soil-rock mixture numerical method for simulating mesostructure master-slave contact surface algorithm saturation degree mechanical characteristics

Received: 19 April 2012

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors

Cite this article:

URL:

http://www.rockmech.org/EN/Y2012/V31/I8/1553

[11]	徐文杰，王永刚. 土石混合体细观结构渗流数值试验研究[J]. 岩土工程学报，2010，32(4)：542-550.(XU Wenjie，WANG Yonggang. Meso-structural permeability of soil-rock mixture based on numerical tests[J]. Chinese Journal of Geotechnical Engineering，2010，32(4)：542-550.(in Chinese)) " target="_blank">
[12]	岳中琦. 岩土细观介质空间分布数字表述和相关力学数值分析的方法、应用和进展[J]. 岩石力学与工程学报，2006，25(5)：875-888.(YUE Zhongqi. Digital representation of mesogeomaterial spatial distribution and associated numerical analysis of geomechanics：methods，applications and development[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(5)：875-888.(in Chinese))
[14]	张宏明. 非饱和土石混合体的力学特性与变形破坏机制研究[硕士学位论文][D]. 武汉：长江科学院，2011.(ZHANG Hongming. Research on mechanical charateristics and machanisms of deformation and failure of unsaturated soil-rock mixture[M. S. Thesis][D]. Wuhan：Yangtze River Scientific Research Institute，2011.(in Chinese)) " target="_blank">
[15]	赫建明，李晓，吴剑波，等. 土石混合体材料的模型构建及其数值试验[J]. 矿冶工程，2009，29(3)：1-4.(HE Jianming，LI Xiao，WU Jianbo，et al. Modeling method of the rock-soil aggregate and its numerical test[J]. Mining and Metallurgical Engineering，2009，29(3)：1-4.(in Chinese)) " target="_blank">
[16]	徐文杰，胡瑞林，岳中琦. 基于数字图像处理的土-石混合体细观结构研究[J]. 辽宁工程技术大学学报：自然科学版，2008，27(1)：51-53.(XU Wenjie，HU Ruilin，YUE Zhongqi. Digital image-based study of the mesostructure character of soil-rock mixtures[J]. Journal of Liaoning Technical University：Natural Science，2008，27(1)：51-53.(in Chinese)) " target="_blank">
[1]	乔建平. 滑坡减灾理论与实践[M]. 北京：科学出版社，1997：127-131.(QIAO Jianping. The theory and practice of landslide disasters reduction[M]. Beijing：Science Press，1997：127-131.(in Chinese)) " target="_blank">
[5]	赫建明. 三峡库区土石混合体的变形与破坏机制研究[博士学位论文][D]. 北京：中国矿业大学，2004.(HE Jianming. Study of deformation and failure mechanisms of soil-rock aggregate in the Three Gorges reservoir area[Ph. D. Thesis][D]. Beijing：China University of Mining and Technology，2004.(in Chinese)) " target="_blank">
[9]	王新. 土石混合体力学特性影响因素及破坏机制研究[硕士学位论文][D]. 武汉：长江科学院，2010.(WANG Xin. Research on influence factors of mechanical characteristics and failure mechanism of soil-rock mixture[M. S. Thesis][D]. Wuhan：Yangtze River Scientific Research Institute，2010.(in Chinese)) " target="_blank">
[2]	贺可强，周敦云，王思敬. 降雨型堆积层滑坡的加卸载响应比特征及其预测作用与意义[J]. 岩石力学与工程学报，2004，23(16)：2 665-2 670.(HE Keqiang，ZHOU Dunyun，WANG Sijing. Feature of loading-unloading response ratio and its significance in prediction of colluvial landslide induced by rainfall[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(16)：2 665-2 670.(in Chinese)) " target="_blank">
[3]	徐文杰，胡瑞林，谭儒蛟，等. 虎跳峡龙蟠右岸土石混合体野外试验研究[J]. 岩石力学与工程学报，2006，25(6)：1 270-1 277. (XU Wenjie，HU Ruilin，TAN Rujiao，et al. Study on field test of rock-soil aggregate on right bank of Longpan in Tiger-leaping gorge area[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(6)：1 270-1 277.(in Chinese)) " target="_blank">
[6]	油新华. 土石混合体的随机结构模型及其应用研究[博士学位论文][D]. 北京：北方交通大学，2001.(YOU Xinhua. Stochastic structural model of the earth-rock aggregate and its application[Ph. D. Thesis][D]. Beijing：Northern Jiaotong University，2001.(in Chinese)) " target="_blank">
[7]	徐扬，高谦. 土石混合体渗透性现场试坑试验研究[J]. 岩土力学，2009，30(3)：855-858.(XU Yang，GAO Qian. In-situ experimental study of permeability of rock and soil aggregates[J]. Rock and Soil Mechanics，2009，30(3)：855-858.(in Chinese)) " target="_blank">
[10]	徐文杰，胡瑞林，岳中崎. 土-石混合体随机细观结构生成系统的研发及其细观结构力学数值试验研究[J]. 岩石力学与工程学报，2009，28(8)：1 652-1 665.(XU Wenjie，HU Ruilin，YUE Zhongqi. Development of random mesostructure generating system of soil-rock mixture and study of its mesostructural mechanics based on mumerical test[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(8)：1 652-1 665.(in Chinese)) " target="_blank">
[18]	FREDLUND D G，RAHARDJO H. 非饱和土土力学[M]. 陈仲颐，张在明，陈俞炯，等译. 北京：中国建筑工业出版社，1997：50-56. (FREDLUND D G，RAHARDJO H. Soil mechanics for unsaturated soil[M]. Translated by CHEN Zhongyi，ZHANG Zaiming，CHEN Yujiong，et al. Beijing：China Building Industry Press，1997：50-56.(in Chinese)) " target="_blank">
[4]	LI X，LIAO Q L，HE J M. In-situ tests and stochastic structural model of rock and soil aggregate in the Three Gorges reservoir area[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(3)：702-707. " target="_blank">
[8]	丁秀丽，李耀旭，王新. 基于数字图像的土石混合体力学性质的颗粒流模拟[J]. 岩石力学与工程学报，2010，29(3)：477-484. (DING Xiuli，LI Yaoxu，WANG Xin. Particle flow modeling mechanical properties of soil and rock mixtures based on digital image[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(3)：477-484.(in Chinese))
[13]	黄克智，徐秉业. 固体力学发展趋势[M]. 北京：北京理工大学出版社，1995：196.(HUANG Kezhi，XU Bingye. Solid mechanics development trend[M]. Beijing：Beijing Institute of Technology Press，1995：196.(in Chinese)) " target="_blank">
[17]	庄茁. ABAQUS/Standard有限元软件入门[M]. 北京：清华大学出版社，2001：203-208.(ZHUANG Zhuo. Introduction to ABAQUS/ Standard finite element software[M]. Beijing：Tsinghua University Press，2001：203-208.(in Chinese)) " target="_blank">
[19]	丁秀丽，黄书岭，卢波，等. 堆积层滑坡土石混合介质的渗流力学响应与变形破坏机制研究[R]. 武汉：长江科学院，2011.(DING Xiuli，HUANG Shuling，LU Bo，et al. Research on mechanics response of seepage and mechanisms of deformation and failure for soil-rock mixture of colluvial landslide[R]. Wuhan：Yangtze River Scientific Research Institute，2011.(in Chinese)) " target="_blank">