Damage evolution of soil-rock mixture based on Fourier series approximations method

doi:10.3785/j.issn.1008-973X.2019.10.013

Journal of ZheJiang University (Engineering Science)

2019, Vol. 53

Issue (10): 1955-1965 DOI: 10.3785/j.issn.1008-973X.2019.10.013

Civil Engineering

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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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

Received: 04 July 2018 Published: 30 September 2019

CLC:

TU 413

Corresponding Authors: Xin-li HU E-mail: zhanghan@cug.edu.cn;huxinli@cug.edu.cn

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Cite this article:

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.

URL:

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

基于傅里叶近似法的S-RM细观损伤过程研究

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

Fig.1 Soil-rock mixture in field

Fig.2 In-suit horizontal push-shear test equipment

Fig.3 Shear suface of horizontal push-shear test

Tab.1 Results of horizontal push-shear test of S-RM

Fig.4 Typical limestone blocks with different grain sizes

Fig.5 Cumulative grading curves of S-RM

Fig.6 Simulation model of S-RM horizontal push-shear test

Tab.2 Meso-parameters of soil and rock blocks

Fig.7 Position and dip angle of meso-cracks

Fig.8 Distribution of meso-crack dip angle and fitted curve

Fig.9 Evolution of horizontal force

Fig.10 Slide surface of horizontal-push shear test

Fig.11 Evolution of meso-cracks/energy disspation/porosity

Fig.12 Evolution of meso-cracks anisotropy

Fig.13 Anisotropy characteristics of meso-cracks in different stages

Fig.14 Evolution of tensile meso-cracks and shear meso-cracks

Fig.15 Evolution of meso-cracks in different dip angle ranges

Fig.16 Evolution of meso-cracks average dip angle

Fig.17 Development of macro-cracks


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