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浙江大学学报(工学版)
浙江大学学报(工学版)  2019, Vol. 53 Issue (10): 1955-1965    DOI: 10.3785/j.issn.1008-973X.2019.10.013
土木工程     
基于傅里叶近似法的S-RM细观损伤过程研究
章涵(),胡新丽*(),吴爽爽
中国地质大学（武汉） 工程学院，湖北 武汉 430074
Damage evolution of soil-rock mixture based on Fourier series approximations method
Han ZHANG(),Xin-li HU*(),Shuang-shuang WU
Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China
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摘要：

为了明确土石混合体（S-RM）的细观损伤演化过程，基于现场水平推剪试验，采用离散元数值模拟方法，开展S-RM水平推剪数值实验研究，分析S-RM的力学特性和细观损伤演化特征. 基于傅里叶近似法，提出微裂纹各向异性定量评价方法. 根据S-RM变形破坏过程中微裂纹各向异性演化特征，划分了S-RM水平推剪细观损伤阶段，通过分析各细观损伤阶段的裂纹扩展特征及发展规律，揭示了S-RM剪切滑动面形成机理. 试验结果表明，微裂纹各向异性程度随着剪切位移的增加而增强，当主裂纹形成后不再有明显变化，微裂纹主要分布在0°~45°与135°~180°；微裂纹的产生主要由于颗粒间的拉应力导致，拉裂纹的各向异性程度明显大于剪切裂纹；土体中微裂纹的贯通导致多条宏观裂纹的形成，由于块石的翻转宏观裂纹逐渐扩展形成一条绕石宏观主裂纹，S-RM沿着主裂纹滑移形成绕石剪切滑动面；滑动面的倾角为34°，与主裂纹倾角和微裂纹在0°~90°的平均角度一致.
关键词： 土石混合体（S-RM）;  傅里叶近似法;  水平推剪试验;  离散元方法;  微裂纹;  细观损伤演化过程    
Abstract:

The numerical tests of soil-rock mixture (S-RM) were performed based on the in-suit horizontal push-shear test (HPST) in order to clarify the meso-damage evolution of S-RM. The mechanical properties and the meso-damage evolution characteristics of S-RM were analyzed by using discrete element method. A quantitative evaluation method for evaluating the anisotropy of S-RM meso-cracks was proposed based on the Fourier series approximation method. The meso-damage stages of HPST of S-RM were divided based on the anisotropy evolution of meso-cracks in the process of deformation and destruction of S-RM. The formation mechanism of S-RM shear surface was analyzed by analyzing the growth and evolution of cracks in different meso-damage stages. Results showed that the anisotropy degree of meso-cracks increased with the increment of shear displacement, but it has no obvious change any more after the formation of principal crack. The dips of meso-cracks were mainly distributed in 0°-45° and 135°-180°. The generation of meso-cracks was mainly caused by the tensile stress between particles. The anisotropy degree of tensile meso-cracks was larger than that of shear meso-cracks. The connections of meso-cracks in the soil gave rise to the formation of multiple macro-cracks. The macro-cracks developed and formed a round-blocks principal crack because of the rotation of rock blocks. The S-RM slide along the principal cracked to form a round-blocks shear slide surface. The dip of slide surface was 34°, same as the dip of principal crack and the average dip of meso-cracks in the range of 0°-90°.
Key words: soil-rock mixture (S-RM)    Fourier series approximations method    horizontal push-shear test    discrete element method    meso-crack    meso-damage evolution
收稿日期: 2018-07-04 出版日期: 2019-09-30
CLC:  TU 413  
通讯作者: 胡新丽     E-mail: zhanghan@cug.edu.cn;huxinli@cug.edu.cn
作者简介: 章涵（1992—），男，博士生，从事岩土工程数值模拟与地质灾害防治的研究. orcid.org/0000-0003-4804-3547. E-mail： zhanghan@cug.edu.cn
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章涵
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引用本文:

章涵,胡新丽,吴爽爽. 基于傅里叶近似法的S-RM细观损伤过程研究[J]. 浙江大学学报(工学版), 2019, 53(10): 1955-1965.

Han ZHANG,Xin-li HU,Shuang-shuang WU. Damage evolution of soil-rock mixture based on Fourier series approximations method. Journal of ZheJiang University (Engineering Science), 2019, 53(10): 1955-1965.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2019.10.013    或    http://www.zjujournals.com/eng/CN/Y2019/V53/I10/1955

图 1  现场S-RM
图 2  现场水平推剪试验装置布置图
图 3  水平推剪试验剪切面
编号 wr/% ww/% c/kPa φ/(°)
1 57.05 12.11 19.3 61.1
2 45.60 12.10 21.2 55.6
3 37.46 10.66 23.5 51.0
4 52.40 20.50 9.7 53.5
5 42.34 19.49 11.7 46.6
6 34.52 20.37 12.5 41.1
表 1  S-RM水平推剪试验结果
图 4  不同粒径典型灰岩块石
图 5  S-RM累计级配曲线
图 6  S-RM水平推剪数值模型图
岩土体 dblock/mm 接触模型 Dp/mm E/MPa Ra ρ/（kg·m?3） Sn/MPa Ss/MPa Eb/MPa Rb f
块石 10~120 平行黏结 4 200 1.0 2 700 24 24 200 1.0 1.5
块石 5~10 线性接触 5~10 200 1.0 2 700 ? ? ? ? 1.5
土体 ? 接触黏结 2~5 10 1.0 2 500 0.17 0.17 ? ? 0.5
表 2  岩土体细观参数
图 7  微裂纹中心位置与倾角示意图
图 8  微裂纹倾角分布图及拟合曲线
图 9  水平推力演化过程
图 10  水平推剪滑动面
图 11  微裂纹/能量消耗/孔隙率演化过程
图 12  微裂纹各向异性演化阶段
图 13  不同阶段微裂纹各向异性特征
图 14  拉裂纹与剪切裂纹演化过程
图 15  不同倾角区间裂纹发展过程
图 16  微裂纹平均倾角演化规律
图 17  宏观裂纹发展过程
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