|
|
Fracture characteristics of compacted red clay based on image processing |
1. Transportation Institute, Inner Mongolia University, Hohhot, Inner Mongolia 010070, China; 2. Research Institute of Integrated Transportation Science of Inner Mongolia, Hohhot, Inner Mongolia 010051, China |
|
|
Abstract Through the laboratory test, the development law of dry shrinkage cracks of compacted red clay in Inner Mongolia was investigated under different drying temperatures. The variation of water content during the cracking of red clay was discussed. By image processing technology, the compacted red clay was quantitatively analyzed based on the fracture network geometry characteristics of average fracture width, total fracture length, fracture rate and fractal dimension. The results show that the water content of the sample has similar trend with the change of drying time at different drying temperatures. In the initial drying stage, the sample loses water quickly and shows linear trend. With the continuation of drying time, the evaporation rate of water gradually slows down and eventually stabilizes. Temperature has significant effect on the development of shrinkage cracks. With the increasing of temperature, the required time is decreased for the fracture development to reach stable state,and the values of fractal dimension and geometric eigenvalue are increased. However, the situation is on the contrary for low temperature. The fractal dimension is exponentially related to fracture length, average fracture width and fracture rate.
|
Received: 07 December 2018
|
|
|
|
[1] |
蔡光华. 垃圾填埋场压实黏土封场系统开裂规律研究\[D\]. 武汉:武汉工业学院, 2012.
|
[2] |
MILLER C J, MI H, YESILLER N. Experimental ana-lysis of desiccation crack propagation in clay liners \[J\]. Journal of the American Water Resources Association,1998 ,34 (3):677-686.
|
[3] |
RINGROSEVOASE A J, SANIDAD W B. A method for measuring the development of surface cracks in soils: application to crack development after lowland rice \[J\].Geoderma, 1996,71 (3/4): 245-261.
|
[4] |
NOVAK V.Soil-crack characteristics-estimation methods applied to heavy soil in the NOPEX area agric\[J\].Fo-rest Meteorol,1999, 98 (31) : 501-507.
|
[5] |
BAER J U , KENT T F, ANDERSON S H.Image analysis and fractal geometry to characterize soil desiccation cracks\[J\].Geoderma,2009,154(1/2):153-163.
|
[6] |
JAN Y L, TSAI S C, HSU C N.Associating characte-rization of bentonite-based buffer/backfill materials by distribution ratio (R(subscript d)) and plastic index (PI) \[J\]. Journal of Marine Science and Technology, 2007,15 (1): 17-23.
|
[7] |
谢和平, 于广明, 杨伦, 等. 采动岩体分形裂隙网络研究\[J\]. 岩石力学与工程学报, 1999, 18(2):147-151.
|
|
XIE H P,YU G M,YANG L,et al. Research on the fractal effects of crack network in overburden rock stratum \[J\]. Chinese Journal of Rock Mechanics and Engineering, 1999, 18(2):147-151. (in Chinese)
|
[8] |
AZZAZ N , HADDAD B . Classification of radar echoes using fractal geometry\[J\]. Chaos Solitons & Fractals, 2017, 98:130-144.
|
[9] |
LU Y , LIU S H, WENG L P , et al. Fractal analysis of cracking in a clayey soil under freeze-thaw cycles\[J\]. Engineering Geology, 2016, 208:93-99.
|
[10] |
WANG C, ZHANG Z Y , LIU Y , et al. Geometric and fractal analysis of dynamic cracking patterns subjected to wetting-drying cycles\[J\]. Soil & Tillage Research, 2017, 170:1-13.
|
[11] |
TANG C S, SHI B, LIU C, et al. Influencing factors of geometrical structure of surface shrinkage cracks in cla-yey soils\[J\]. Engineering Geology, 2008, 101(3/4):204-217.
|
[12] |
周东,王利明,欧孝夺,等.环境温湿度对粘土干缩裂缝结构形态影响\[J\].广西大学学报(自然科学版),2012,37(2):204-209.
|
|
ZHOU D,WANG L M,OU X D,et al.Influence of environment temperature and humidity on structural morpho-logy of desiccation fissures in clay\[J\].Journal of Guang-xi University(Natural Science Edition),2012,37(2):204-209. (in Chinese)
|
|
|
|