土石混合体的剪切面分形特征及强度产生机制

doi:10.13722/j.cnki.jrme.2016.0967

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (1292 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要基于考虑含石量、含水率、块石岩性、初始孔隙比、法向压力5个影响因素的土石混合体室内大型直剪试验，利用剪切面在分形几何学上的统计规律和颗粒流数值模拟方法得到的直剪试验中颗粒的相互作用规律，对土石混合体的抗剪强度产生机制进行研究。结果表明：(1) 土石混合体的剪切面呈不规则的起伏形态与块石的存在关系密切，且具有较好的分形特征，分形维数随着含石量和块石强度的增大、含水率和法向压力的减小均呈增大趋势；(2) 含石量高于40%时，黏聚力小于30 kPa；(3) 内摩擦角随着含石量的增大、块石强度的增大、含水率的降低、初始孔隙比的降低、法向压力的降低均呈增大规律，且与分形维数满足正相关函数关系；(4) 块石附近应力集中较明显，剪切过程中，颗粒间的接触力主要通过迎着剪切方向的接触面传递，而背着剪切方向的颗粒接触面基本不传递力；(5) 内摩擦角等于剪切面上与颗粒本身接触性质有关的接触面内摩擦角和与剪切面分形维数有关的接触面倾角之和，利用此机制可解释直剪试验中强度参数的变化规律。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	刘新荣1
	2
	涂义亮1
	2
	王林枫1
	2
	冯昊1
	2
	钟祖良1
	2
	雷晓丹1
	2
	王雷1
	2

关键词 ：土工试验, 土石混合体, 剪切面, 分形维数, 强度产生机制

Abstract：The large-scale direct shear test was conducted to soil-rock aggregate with different rock contents，water contents，rock lithology，initial void ratios and normal pressures. The shear strength mechanism of soil-rock aggregate was analyzed through the statistical analysis of fractal geometry of shear surface and the numerical simulation of particle interactions in the direct shear test with the particle flow code. The results indicate that the irregular topography of the shear failure surfaces of soil-rock aggregate are closely related to the existence of rock blocks and presents the fractal characteristics. The fractal dimension increases gradually with the decreasing of water content and normal pressure and the increasing of rock content and strength. If the rock content is more than 40%，the cohesion will be less than 30 kPa. The internal friction angle increases with the increasing of rock content and strength，the decreasing of water content，initial void ratio and normal pressure，and it has a positive correlation with the fractal dimension. The stress concentration happens near the rock particles. In the process of shearing，the contact force between the particles transfer mainly through the surface in the direction of shearing，but the contact surfaces back to the shear direction does not appear to transfer force. The internal friction angle is equal to the sum of and ，where is the internal friction angle of the contact surface of particles on the shear plane related to the particle?s properties and is the dip angle of the contact surfaces of particles related to the fractal dimension on the shear surface. The variation of shear strength parameters in the shear test can be explained with this mechanism.

Key words： soil test soil-rock aggregate shear failure surface fractal dimension strength generation mechanism

引用本文:

刘新荣1，2，涂义亮1，2，王林枫1，2，冯昊1，2，钟祖良1，2，雷晓丹1，2，王雷1，2. 土石混合体的剪切面分形特征及强度产生机制[J]. 岩石力学与工程学报, 2017, 36(9): 2260-2274.
LIU Xinrong1，2，TU Yiliang1，2，WANG Linfeng1，2，FENG Hao1，2，ZHONG Zuliang1，2，LEI Xiaodan1，2，WANG Lei1，2. Fractal characteristics of shear failure surface and mechanism of strength generation of soil-rock aggregate#br#. , 2017, 36(9): 2260-2274.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2016.0967 或 http://www.rockmech.org/CN/Y2017/V36/I9/2260

[3]	XU W J，HU R L，TAN R J. Some geomechanical properties of soil-rock mixtures in Tiger-leaping Gorge Area，China[J]. Géotechnique，2007，57(3)：255-264. " target="_blank">
[25]	FREDLUND D G，RAHARDJO H. Soil mechanics for unsaturated soils[M]. New York：John Wiley and Sons Inc.，1993：223-287. " target="_blank">
[4]	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))
[7]	李维树，丁秀丽，邬爱清，等. 蓄水对三峡库区土石混合体直剪强度参数的弱化程度研究[J]. 岩土力学，2007，28(7)：1 338-1 342. (LI Weishu，DING Xiuli，WU Aiqing，et al. Shear strength degeneration of soil and rock mixture in Three Gorges Reservoir bank slopes under influence of impounding[J]. Rock and Soil Mechanics，2007，28(7)：1 338-1 342.(in Chinese))
[15]	石崇，王盛年，刘琳，等. 基于数字图像分析的冰水堆积体结构建模与力学参数研究[J]. 岩土力学，2012，33(11)：3 393-3 399. (SHI Chong，WANG Shengnian，LIU Lin，et al. Structure modeling and mechanical parameters research of outwash deposits based on digital image analysis[J]. Rock and Soil Mechanics，2012，33(11)：3 393-3 399.(in Chinese))
[17]	MANDELBROT B B. The fractal geometry of nature[M]. New York：Freeman W. H.，1983：123-189. " target="_blank">
[27]	DUNCAN J M，CHANG C Y. Nonlinear analysis of stress and strain in soils[J]. Journal of the Soil Mechanics and Foundation Division，ASCE，1970，96(SM5)：1 629-1 653. " target="_blank">
[29]	THORNTON C，ZHANG L. On the evolution of stress and microstructure during general 3D deviatoric straining of granular media[J]. Géotechnique，2010，60(5)：333-341. " target="_blank">
[10]	刘忠强，薛亚东，黄宏伟，等. 崩积体剪切性能试验研究[J]. 岩土力学，2012，33(8)：2 349-2 358.(LIU Zhongqiang，XUE Yadong，HUANG Hongwei，et al. Experimental research on shear behavior of colluvium[J]. Rock and Soil Mechanics，2012，33(8)：2 349-2 358. (in Chinese)) " target="_blank">
[11]	舒志乐，刘新荣，刘保县. 基于分形理论的土石混合体强度特征研究[J]. 岩石力学与工程学报，2009，28(增1)：2 652-2 656.(SHU Zhile，LIU Xinrong，LIU Baoxian. Study of strength properties of earth-rock aggregate based on fractals[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(Supp.1)：2 652-2 656.(in Chinese))
[20]	KULATILAKE P H S W，BALASINGAM P，PARK J，et al. Natural rock joint roughness quantification through fractal techniques[J]. Geotechnical and Geological Engineering，2006，24(5)：1 181-1 202. " target="_blank">
[2]	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 on deformation and failure mechanisms of rock-soil aggregate in Three Gorges Reservoir area[Ph. D. Thesis][D]. Beijing：China University of Mining and Technology，2004.(in Chinese)) " target="_blank">
[5]	COLI N，BERRY P，BOLDINI D. In situ non-conventional shear tests for the mechanical characterization of a bimrock(Bimtest)[J]. International Journal of Rock Mechanics and Mining Sciences， 2011，48(1)：95-102.
[21]	BABANOURI N，KARIMI N S，SARAFRAZI S. A hybrid particle swarm optimization and multi-layer perceptron algorithm for bivariate fractal analysis of rock fractures roughness[J]. International Journal of Rock Mechanics and Mining Sciences，2013，60(60)：66-74. " target="_blank">
[22]	中华人民共和国行业标准编写组. SL237—1999 土工试验规程[S]. 北京：中国水利水电出版社，1999.(The Professional Standards Compilation Groups of People′s Republic of China. SL237—1999 Specification of soil test[S]. Beijing：China Water Power Press，1999.(in Chinese)) " target="_blank">
[23]	郭庆国. 粗粒土的工程特性及应用[M]. 郑州：黄河水利水电出版社，1998：11-48.(GUO Qingguo. Engineering characteristics and application of coarse grained soil[M]. Zhengzhou：The Yellow River Water Conservancy and Hydropower Press，1998：11-48.(in Chinese)) " target="_blank">
[26]	李广信. 高等土力学[M]. 北京：清华大学出版社，2004：129-141.(LI Guangxin. Advanced soil mechanics[M]. Beijing：Tsinghua University Press，2004：129-141.(in Chinese)) " target="_blank">
[9]	薛亚东，岳磊，李硕标. 含水率对土石混合体力学特性影响的试验研究[J]. 工程地质学报，2015，23(1)：21-29.(XUE Yadong，YUE Lei，LI Shuobiao. Experimental study on mechanical properties of soil-rock mixture containing water[J]. Journal of Engineering Geology，2015，23(1)：21-29.(in Chinese))
[24]	贾宇峰，王丙申，迟世春. 堆石料剪切过程中的颗粒破碎研究[J]. 岩土工程学报，2015，37(9)：1 692-1 697.(JIA Yufeng，WANG Bingshen，CHI Shichun. Particle breakage of rockfill during triaxial tests[J]. Chinese Journal of Geotechnical Engineering，2015，37(9)：1 692-1 697.(in Chinese))
[30]	SKEMPTON A W. Effective stress in soils，concrete and rocks[C]// Proceedings of the Conference on Pore Pressure and Suction in Soils. [S.l.]：[s.n.]，1960：4-16. " target="_blank">
[6]	李维树，邬爱清，丁秀丽. 三峡库区滑带土抗剪强度参数的影响因素研究[J]. 岩土力学，2006，27(1)：56-60.(LI Weishu，WU Aiqing，DING Xiuli. Study on influencing factors of shear strength parameters of slide zone clay in Three Gorges Reservoir Area[J]. Rock and Soil Mechanics，2006，27(1)：56-60.(in Chinese))
[8]	邓华锋，原先凡，李建林，等. 土石混合体直剪试验的破坏特征及抗剪强度取值方法研究[J]. 岩石力学与工程学报，2013，32(增2)：4 065-4 072.(DENG Huafeng，YUAN Xianfan，LI Jianlin，et al. Research on failure characteristics and determination method for shear strength of soil-rock aggregate in direct shear tests[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(Supp.2)：4 065-4 072. (in Chinese))
[12]	丁秀丽，张宏明，黄书岭，等. 基于细观数值试验的非饱和土石混合体力学特性研究[J]. 岩石力学与工程学报，2012，31(8)：1 553-1 566.(DING Xiuli，ZHANG Hongming，HUANG Shuling，et al. Research on mechanical characteristics of unsaturated soil-rock mixture based on numerical experiments of mesostructure[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(8)：1 553-1 566.(in Chinese))
[13]	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))
[14]	董启朋，卢正，詹永祥，等. 土石混合体原位试验的颗粒流数值模拟分析[J]. 上海交通大学学报，2013，47(9)：1 382-1 389. (DONG Qipeng，LU Zheng，ZHAN Yongxiang，et al. Particle flow modeling of soil-rock mixture in situ tests[J]. Journal of Shanghai Jiaotong University，2013，47(9)：1 382-1 389.(in Chinese))
[16]	XU W J，XU Q，HU R L. Study on the shear strength of soil-rock mixture by large scale direct shear test[J]. International Journal of Rock Mechanics and Mining Sciences，2011，48(8)：1 235-1 247. " target="_blank">
[19]	YANG Z Y，TAGHICHIAN A，HUANG G D. On the applicability of self-affinity concept in scale of three-dimensional rock joints[J]. International Journal of Rock Mechanics and Mining Sciences，2011，48(7)：1 173-1 187. " target="_blank">
[1]	徐文杰，胡瑞林. 土石混合体概念、分类及意义[J]. 水文地质工程地质，2009，36(4)：50-56.(XU Wenjie，HU Ruilin. Conception，classification and significations of soil-rock mixture[J]. Hydrogeology and Engineering Geology，2009，36(4)：50-56.(in Chinese))
[18]	谢和平. 分形-岩石力学导论[M]. 北京：科学出版社，1996：3-35.(XIE Heping. Fractal-rock mechanics[M]. Beijing：Science Press，1996：3-35.(in Chinese)) " target="_blank">
[28]	YOON J. Application of experimental design and optimization to PFC model calibration in uniaxial compression simulation[J]. International Journal of Rock Mechanics and Mining Sciences，2007，44(6)：871-889.