压实膨胀土表面裂隙参数之间的关系分析

Analysis of the Relationship Among the Surface Crack Parameters of Compacted Expansive Soil

利用图像处理软件对干湿循环后不同压实度的膨胀土试样表面裂隙参数进行提取,并通过曲线回归和拟合得到了裂隙参数之间的函数关系.结果表明:1)裂隙网络相关参数及块区个数、裂隙率、分形维数随干湿循环次数增加而增大,而块区平均面积逐步减小.提高膨胀土的压实度,可有效地抑制土样的开裂.2)裂隙条数、裂隙总长度、块区个数与裂隙率和分形维数都具有良好的指数关系,裂隙平均宽度和块区平均面积与裂隙率分别具有较好的二次多项式关系和对数关系,裂隙平均宽度与分形维数却具有很好的线性关系,区块平均面积与分形维数则具有较好的幂函数关系.实验结果可以简化裂隙的量测,推进裂隙的定量化表述和裂隙的数值模拟化.

Image processing software was used to extract surface crack parameters of the different compacted expansive soil samples under dry-wet cycles , and the function relation between the fracture parameters was obtained through the regression analysis and fitting .The results show that：1.Related parameters of fracture network and block number , fracture rate, fractal dimension increase with cycle number increasing , while the average area of the block area gradually decreases .Improved expansive soil compaction , soil sample cracking can be effectively restrained;2.Fracture number, fracture length, block number with crack rate and fractal dimension have good exponential relationship .The average area and average width of crack with crack rate respectively have good two order polynomial and logarithmic relationship .The average fracture width and fractal dimension have a good linear relationship .The average block size and fractal dimension tend to be a good power function relationship .The results can be simplified to measure crack , and can promote the fracture quantitative description and numerical simulation .