单轴压缩条件下土石混合体开裂特征研究

doi:10.13722/j.cnki.jrme.2014.0389

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (772 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要土石混合体作为一种物质成分和内部结构特征极为复杂的多相多组分散粒材料，其破坏是一个复杂的结构变化过程。应用CT试验和数值模拟方法研究土石混合体的变形破坏特征，指出开裂是土石混合体区别于其他地质体变形破坏的一个显著特征。土石混合体破坏的根本原因是块石与土体的弹性不匹配和土–石界面的差异滑动，破坏的实质是内部裂纹产生、扩展、互锁和贯通的过程。通过对土石混合体开裂机制的研究得出以下结论：(1) 基于CT试验的变形特征分析表明试样、块石包裹体及其邻近土体三个感兴趣区域的CT数随应力水平的增加而不断减小，且块石包裹体的CT数变化较土体更为敏感。(2) 数值模拟结果表明试样破坏过程经历了土石结合裂纹的萌生、慢裂、快裂致贯通破坏的过程。土石接触面是最薄弱的部位，荷载作用下界面差异滑动引起裂纹的产生，随后裂纹沿块石边界缓慢扩展直至扩展到土体中，受块石形状及分布的影响，裂纹会出现局部化发展和互锁现象。大量裂纹在土体中快速扩展聚集引起试样的破坏。(3) 土石混合体的破坏具有渐进性的过程，破坏可分为三级：一是土–石界面的开裂，二是土体中裂纹的扩展、聚集和贯通并且最终导致试样的破坏，三是针对软弱的片岩块石的穿石破坏。

	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

关键词 ：土力学, 土石混合体, 开裂破坏, CT试验, 数值模拟, 应力&ndash, 应变曲线

Abstract：Rock and soil aggregate(RSA) is a kind of multiphase and multi-component material and its composition and internal structure characteristic is very complex. The damage process of RSA is a complex structure change process. CT tests and numerical simulation method are used to study the deformation and cracking characteristics of RSA，and it is point that cracking failure is a unique characteristic for RSA which differs from other geology bode. The primary reason cracking is the elastic mismatch between rock blocks and soil. The essence for RSA failure is a process including crack initiation，propagation，interlocking and coalescence. In this paper，some conclusions can be drawn as follows：(1) The RSA deformation features analysis based on CT tests show that the mean CT value for specimen，rock block inclusions and its adjacent soil region decease with the increase of loading，and the change is more sensitive for block inclusions. (2) The numerical simulation results show that the failure process of RSA go through with crack initiation，slow-cracking，fast cracking and coalescence. Interface between rock blocks and soil is the weakest part of RSA. The difference sliding unloading result in the crack initiation，then cracks propagate to soil along block boundary and cracks are influenced by rock blocks. The local development of crack and interlocking leading to formation of shear line with X character or wedge shape. (3) Failure of RSA is a progressive process which can be divided into three levels——rock-soil interface cracking，soil cracking and rock cracking.

Key words： soil mechanics rock and soil aggregate(RSA) cracking failure CT test numerical simulation stress-strain curve

引用本文:

王宇，李晓，李守定，李关访，赵志恒. 单轴压缩条件下土石混合体开裂特征研究[J]. 岩石力学与工程学报, 2015, 34(s1): 3541-3552.
WANG Yu，LI Xiao，LI Shouding，LI Guanfang，ZHAO Zhiheng. CRACKING DEFORMATION CHARACTERISTICS FOR ROCK AND SOIL AGGREGATE UNDER UNIAXIAL COMPRESSIVE TEST. , 2015, 34(s1): 3541-3552.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0389 或 http://www.rockmech.org/CN/Y2015/V34/Is1/3541

[6]	周中，傅鹤林，刘宝琛. 土石混合体渗透性能的试验研究[J]. 湖南大学学报：自然科学版，2006，33(6)：25-28.(ZHOU Zhong，FU Helin，LIU Baochen. Experimental Study of the Permeability of Soil- Rock-Mixture[J]. Journal of Hunan University：Natural Sciences，2006，33(6)：25-28.(in Chinese))
[11]	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))
[14]	油新华，李晓，贺长俊.土石混合体实测结构模型的自动生成技术[J]. 岩土工程界，(8)：60-62.(YOU Xinhua，LI Xiao，HE Changjun. The automatic generation technology for measured structural model of soil-rock-mixture[J]. Geotechnical Engineering World，6(8)：60-62.(in Chinese))
[1]	油新华，汤劲松. 土石混合体野外水平推剪试验研究[J]. 岩石力学与工程学报，2002，21(10)：1 537-1 540.(YOU Xinhua，TANG Jingsong. Research on horizontal push-shear in-situ test of soil and rock-mixture[J]. Chinese Journal of Rock Mechanics and Engineering，2002，21(10)：1 537-1 540.(in Chinese))
[3]	徐文杰，胡瑞林，曾如意. 水下土石混合体的原位大型水平推剪试验研究[J]. 岩土工程学报，2006，28(7)：815-818.(XU Weijie，HU Ruilin，ZENG Ruyi. Research on horizontal push-shear in-situ test of subwater soil-rock mixture[J]. Chinese Journal of Geotechnical Engineering，2006，28(7)：815-818.(in Chinese)) " target="_blank">
[7]	董云. 土石混合料力学特性的试验研究[硕士学位论文][D]. 重庆：重庆交通大学，2005.(Dong Yun. Test research on the mechanics characteristics of rock-soil aggregate mixture[M. S. Thesis][D]. Chongqing：Chongqing Jiaotong University，2005.(in Chinese)) " target="_blank">
[10]	徐文杰. 土石混合体细观结构力学及其边坡稳定性研究[博士学位论文[D]. 北京：中国科学院地质与地球物理研究所，2008.(XU Wenjie. Study on meso-structural mechnaics(M-SM) of soil-rock mixture (S-RM) and its slope stability[Ph. D. Thesis][D]. Beijing：Institute of Geology and Geophysics Chinese Academy of Science，2008.(in Chinese)) " target="_blank">
[13]	油新华. 土石混合体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，2001：1-18.(YOU Xinghua. Stochastic structural model of the earth-rock aggregade and its application[Ph. D. Thesis][D]. Beijing：Northern Transportation University，2001：1-18.(in Chinese)) " target="_blank">
[18]	南京水利水电科学研究所. 土工试验技术手册[M]. 北京：人民交通出版社，2004：17-73.(Nanjiing water conservancy science research institute. Soil test technical manuals[M]. Beijing：China Communication Press，2004：17-73.(in Chinese)) " target="_blank">
[23]	PERFECT E，ZHAI Q，BLEVINS R L. Estimation of weibull brittle fracture parameters for heterogeneous materials[J]. Soil Science Society of America Journal，1998，62(5)：1 212-1 219. " target="_blank">
[25]	MUNKHOLM L，PERFECT E. Brittle fracture of soil aggregates：Weibull models and methods of parameters estimation[J]. Soil science Society of America Journal，2005，69：1 565-1 571. " target="_blank">
[26]	王宇，李晓. 土石混合体损伤开裂计算细观力学探讨[J]. 岩石力学与工程学报，2014，33(增2)：1 000-1 013.(WANG Yu，LI Xiao. Research on damage cracking for rock and soil aggregate using calculation meso-mechanics[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(Supp.2)：1 000-1 013.(in Chinese)) " target="_blank">
[2]	李晓，廖秋林，赫建明，等. 土石混合体力学特性的原位试验研究[J]. 岩石力学与工程学报，2007，26(12)：2 378-23 84.(LI Xiao，LIAO Qiulin，HE Jianming，et al. Study on in-situ tests of mechanical characteristics on soil-rock aggregate[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(12)：2 378-2 384.(in Chinesee))
[22]	孙强，胡秀宏. 岩土本构中应变软化与Weibull分布的思考[J]. 金属矿山，2008，(10)：39-42.(SUN Qiang，HU Xiuhong. On the strain-softening of geotechnical constitutive model and Weibull distribution[J]. Metal Mine，2008，(10)：39-42.(in Chinese)) " target="_blank">
[4]	LI X，LIAO Q L，HE J M. In-situ and stochastic structural model of rock and soil aggregate in the Three Gorges reservoir area，China[J]. Journal of Rock Mechanics and Mining Science，2005，42(3)：494. " target="_blank">
[15]	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))
[19]	British standard. Methods of test for Soils for civil Engineering purposes—Part 1：General requirements and sample preparation，BS1377-1，1990. " target="_blank">
[24]	PERFECT E，KAY B D. Statistical characterization of dry aggregate strength using rupture energy[J]. Soil science society of America Journal，1994，58：1 804-1 809. " target="_blank">
[5]	李兴瑞. 土石混合体的变形特性试验研究[硕士学位论文][D]. 大连：大连理工大学，2012.(LI Xingrui. Experimental study on deformation characteristics of earth-rock aggregate[M. S. Thesis][D]. Dalian：Dalian University of Technology，2012.(in Chinese)) " target="_blank">
[9]	刘汉龙，秦红玉，高玉峰，等. 堆石粗粒料颗粒破碎试验研究[J]. 岩土力学，2005，26(4)：562-566.(LIU Hanlong，QIN Hongyu，GAO Yufeng，et al. Experimental study on particle breakage of rockfill and coarse aggregates[J]. Rock and Soil Mechanics，2005，26(4)：562-566.(in Chinese))
[17]	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))
[21]	谢星，王东红，赵法锁. 基于Weibull分布的黄土状土的单轴损伤模型[J]. 工程地质学报，2013，21(2)：318-323.(XIE Xing，WANG Donghong，ZHAO Fasuo. Weibull random distribution based damage constitution model of loessial soils under uniaxial compression[J]. Journal of Engineering Geology，2013，21(2)：318-323.(in Chinese))
[8]	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))
[12]	廖秋林. 土石混合体地质成因、结构模型及其力学特性、固流耦合特性研究[博士学位论文][D]. 北京，中国科学院研究生院，2006.(LIAO Qiulin. Geological origin and structure model of rock and soil aggregate and study on its mechanical and MH coupled propreties[Ph. D. Thesis][D]. Beijing：Chinese Academy of Science，2006. (in Chinese))
[16]	李世海，汪远年. 三维离散元土石混合体随机计算模型及单向加载试验数值模拟[J]. 岩土工程学报，2004，36(2)：173-177.(LI Shihai，WANG Yuannian. Stochastic model and numerical simulation of uniaxial loading test for rock and soil blending by 3D-DEM[J]. Chinese Journal of Geotechnical Engineering，2004，36(2)：173-177. (in Chinese))
[20]	罗晓辉，卫军，白世伟. 脆性统计损伤模型在岩土工程中的应用研究[J]. 华中科技大学学报：自然科学版，2004，32(9)：83-85. (LUO Xiaohui，WEI Jun，BAI Shiwei. The Appl ication of brittleness statistical damage model to geotechnical engineering[J]. Journal of Huazhong University of Science and Technology：Nature Science，2004，32(9)：83-85. (in Chinese))