[1]高文伟,高 玮,胡瑞林,等.块石空间定向性对土石混合体力学性质的影响[J].防灾减灾工程学报,2019,39(01):89-97.[doi:10.13409/j.cnki.jdpme.2019.01.013]
 GAO Wenwei,GAO Wei,HU Ruilin,et al.Effects of Rock Block Orientation on the Mechanical Characteristics of Rock and Soil Aggregate[J].Journal of Disaster Prevention and Mitigation Engineering,2019,39(01):89-97.[doi:10.13409/j.cnki.jdpme.2019.01.013]
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块石空间定向性对土石混合体力学性质的影响()
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防灾减灾工程学报[ISSN:1672-2132/CN:32-1695/P]

卷:
39卷
期数:
2019年01期
页码:
89-97
栏目:
论文
出版日期:
2019-02-28

文章信息/Info

Title:
Effects of Rock Block Orientation on the Mechanical Characteristics of Rock and Soil Aggregate
文章编号:
1672-2132(2019)01-0089-09
作者:
高文伟12 高 玮1 胡瑞林1 潘尚涛12 隋皓月12
1.中国科学院页岩气与地质工程重点实验室,北京 100029; 2.中国科学院大学,北京 100049
Author(s):
GAO Wenwei12 GAO Wei1 HU Ruilin1 PAN Shangtao12 SUI Haoyue12
1.Key Laboratory of Shale Gas and Geo-engineering, Chinese Academy of Sciences, Beijing 100029,China; 2.University of Chinese Academy of Sciences, Beijing 100049,China
关键词:
土石混合体 空间定向性 颗粒流 双轴试验 力学特性 破坏形态
Keywords:
rock and soil aggregate(RSA) spatial orientation particle flow code(PFC) biaxial test mechanical characteristics failure mode
分类号:
TU443
DOI:
10.13409/j.cnki.jdpme.2019.01.013
文献标志码:
A
摘要:
土石混合体作为一种土和石的特殊混合体,其宏观变形破坏及力学性质与块石的空间定向性密切相关。为了研究块石定向性对土石混合体变形破坏机理的影响,采用二维颗粒流软件中FISH语言编写算法生成不同角度的椭圆形块石,建立土石混合体二维颗粒流数值模型,分别进行了单块石和多块石条件下土石混合体双轴试验数值模拟,对其变形破坏机理进行了深入分析。结果表明:块石角度不同时,土体中裂纹萌生位置不同; 随着块石短轴方向与最大主压力轴夹角增大,土石混合体黏聚力先减小后增加,内摩擦逐渐减小; 在应力峰值前的应力平缓增长阶段,土体中裂纹迅速增长,在试样强度达到峰值后进入残余强度阶段,裂纹的增速也逐渐降低; 块石角度不同时,土石混合体的剪切带破坏形式不同。
Abstract:
Rock and soil aggregate(RSA)is a complex mixture of soil and rock, and its macroscopic deformation and mechanical characteristics are closely related to the spatial distribution of rocks.To study the deformation and failure mechanism of RSA with different directional distributions of rock blocks, a two-dimensional numerical RSA model was constructed using the FISH language in the particle flow code(PFC).Different directions of oval shaped rock blocks were generated and, then, numerical simulation of biaxial compression tests were conducted with single rock block and multi rock blocks, followed by a discussion of the deformation and failure mechanism.Results indicated that the location of crack initiation in the soil was different when the angle of rock blocks were different.With the increase of the degree between rock blocks' short axis and the direction of minimum principal pressure axis, the cohesion of the RSA decreased firstly and then increased, and the angle of internal friction decreased gradually.The crack in soil increased rapidly at the stage of gentle stress growth before reaching the peak strength, while the increase rate decreased gradually when the residual strength was reached.The pattern of shear failure zone was often different if the degree between rock blocks' long axis and the maximum principal pressure axis are different.

参考文献/References:

[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):50-56,70.
Xu W J,Hu R L.Conception, classification and significations of soil-rock mixture[J].Hydrogeology and Engineering Geology,2009,36(4):50-56,70.(in Chinese)
[2] Medley E W.Uncertainty in estimates of block volumetric proportion in mélange bimrocks[C]//Proceedings of the International Symposium on Egineering Geology and the Environment.Greek: Greek National Group of IAEG,1997:267-272.
[3] 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):2 377-2 384.
Li X,Liao Q L,He J M,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):2 377-2 384.(in Chinese)
[4] 徐文杰,胡瑞林.循环荷载下土石混合体力学特性野外试验研究[J].工程地质学报,2008,16(1):63-69.
Xu W J,Hu R L.Field horizontal push shear test for mechanical property soil-rock mixtures under cycle loading[J].Journal of Engineering Geology,2008, 16(1):63-69.(in Chinese)
[5] 舒志乐,刘新荣,刘保县,等.土石混合体粒度分形特性及其与含石量和强度的关系[J].中南大学学报(自然科学版),2010,41(3):1 096-1 101.
Shu Zh L,Liu X R,Liu B X,et al.Granule fractal properties of earth-rock aggregate and relationship between its gravel content and strength[J].Journal of Central South University(Science and Technology),2010,41(3):1 096 -1 101.(in Chinese)
[6] 王 宇,李 晓.土石混合体细观分形特征与力学性质研究[J].岩石力学与工程学报,2015,34(增1):3 397-3 407.
Wang Y,Li X.Study of mesoscopic fractal feature and mechanical properties for rock and soil aggregate samples[J].Chinese Journal of Rock Mechanics and Engineering,2015, 34(Sup 1):3 397-3 407.(in Chinese)
[7] 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 H F,Yuan X F,Li J L,et al.Research on failure characteristics and determination method for shear strength of earth-rock aggregate in direct shear tests [J].Chinese Journal of Rock Mechanics and Engineering,2013,32(Sup 2):4 065- 4 072.(in Chinese)
[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 X L,Li Y X,Wang X.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)
[9] 周 剑,张路青,戴福初,等.基于黏结颗粒模型某滑坡土石混合体直剪试验数值模拟[J].岩石力学与工程学报,2013,32(增1):2 650-2 659.
Zhou J,Zhang L Q,Dai F Ch,et al.Numerical simulation of direct shear tests for rock and soil mixture in a landslide based on bonded-particle model[J].Journal of Rock Mechanics and Engineering, 2013,32(Sup 1):2 650-2 659.(in Chinese)
[10] 邵 帅,季顺迎.块石空间分布对土石混合体边坡稳定性的影响[J].工程力学,2014,31(2):177-183.
Shao Sh,Ji Sh Y.Effects of rock spatial distributions on stability of rock-soil-mixture slope [J].Engineering Mechanics,2014,31(2):177-183.(in Chinese)
[11] 金 磊,曾亚武,李晶晶.胶结土石混合体力学特性的块石形状效应细观机理分析[J].固体力学学报,2015,36(6):506-516.
Jin L,Zeng Y W,Li J J.Analysis on meso-mechanisms of influence of rock block shape on mechanical properties of cemented soil-rock mixture [J].Chinese Journal of Solid Mechanics,2015,36(6):506-516.(in Chinese)
[12] 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 W J,Hu R L,Yue Zh Q,et al.Development of random mesostructure generating system of soil-rock mixture and study of its mesostructural mechanics based on numerical test[J].Chinese Journal of Rock Mechanics and Engineering, 2009,28(8):1 652-1 665.(in Chinese)
[13] Li Y R,Huang R Q,Chan L S,et al.Effects of particle shape on shear strength of clay-gravel mixture [J].KSCE Journal of Civil Engineering,2013,17(4):712-717.
[14] Li Y R.Effect of particle shape and size distribution on the shear strength behavior of composite soils[J].Bulletin of Engineering Geology and the Environment,2013,72(3/4):371-381.
[15] 焦玉勇,王 浩,马江锋.土石混合体力学特性的颗粒离散元双轴试验模拟研究[J].岩石力学与工程学报,2015, 34(增1):3 564-3 573.
Jiao Y Y,Wang H,Ma J F.Research on biaxial test of mechanical characteristics on soil-rock aggregate(SRA)based on particle flow code simulation [J].Journal of Rock Mechanics and Engineering,2015,34(Sup 1):3 564-3 573.(in Chinese)
[16] 高 玮,胡瑞林.基质胶结对土石混合体强度变形特性影响[J].吉林大学学报(地球科学版),2015,45(4):1 164-1 172.
Gao W,Hu R L.Experimental research on strength characteristics of soil-rock mixture with different matrix bonding[J].Journal of Jilin University(Earth Science Edition),2015,45(4):1 164 - 1 172.(in Chinese)
[17] Lindquist E S,Goodman R E.Strength and deformation properties of a physical model melange[C]//1st North American Rock Mechanics Symposium.Austin: American Rock Mechanics Association,1994:842-850.
[18] Medley E W,Rehermann P F S.Characterization of bimrocks(rock/soil mixtures)with application to slope stability problems [J].Eurock 2004 &53rd Geomechanics Colloquium Salzburg, Austria, OCT,2004,21(9):1-7.
[19] Medley E W.The engineering characterization of melanges and similar block-in-matrix rocks(bimrocks)[D].Berkeley:University of California,1994.
[20] 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):4 020-4 031.
Wang Y,Li X.Research on damage cracking for rock and soil aggregate using calculation meso-mechanics[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(Sup 2):4 020-4 031.(in Chinese)

备注/Memo

备注/Memo:
收稿日期:2017-10-11; 修回日期:2018-04-10 基金项目:国家自然科学基金项目(41330643)资助 作者简介:高文伟(1990-),男,博士研究生。主要从事岩土工程与地质灾害研究。Email:smile_gww@163.com
更新日期/Last Update: 2019-02-20