湿干循环下压实膨胀土裂隙扩展规律研究

发布时间：2018-04-08 16:36

本文选题：湿干循环　切入点：压实膨胀土　出处：《岩土工程学报》2014年07期

【摘要】：裂隙特征作为膨胀土裂隙性研究的基础,其定量化描述有助于膨胀土工程性质的深入探究。以膨胀土平面裂隙为研究对象,使用数码摄影获取多次湿干循环下的裂隙扩展图像,采用优化和改进的裂隙图像处理及裂隙特征提取方法,分析所获得的膨胀土裂隙各特征参数。结果表明:室内压实膨胀土表面裂隙率随着湿干循环次数增加而增大,且第二次湿干循环对裂隙率影响最为显著;裂隙发育峰值条数在第一次湿干循环后最多,总长度最大,而三次湿干循环后的裂隙条数和总长度较为相近;裂隙宽度随湿干循环次数增加而增大,且第二次湿干循环影响最为显著;同时,第一次湿干循环中主裂隙发育最明显,在第二次和第三次中宽度发育趋于均匀;通过裂隙方向玫瑰花图发现,裂隙主要沿着初始方向扩展,直至下一次湿干循环;裂隙发育方向在第一次湿干循环中是随机的,而在第二次与第三次中有较高相似性,表明湿干循环对裂隙发育方向的影响也主要发生在第二次。
[Abstract]:The characteristic parameters of fissures in expansive soil are analyzed.The results show that the surface fracture rate increases with the increase of wet dry cycle, and the second wet dry cycle has the most significant effect on the fracture rate, and the peak number of fracture development is the most after the first wet dry cycle, and the total length is the largest.However, the number and total length of fractures after three wet dry cycles are similar, the width of fractures increases with the increase of the number of wet dry cycles, and the second wet dry cycle has the most significant effect, meanwhile, in the first wet dry cycle, the development of main fractures is the most obvious.In the second and third times, the width of the crack tends to be uniform. By using the rose pattern of the crack, it is found that the crack mainly extends along the initial direction until the next wet dry cycle, and the direction of the crack development is random in the first wet dry cycle.There is a high similarity between the second and the third, which indicates that the influence of wet dry cycle on fracture development direction mainly occurs in the second time.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家自然科学基金项目(51279200,51079141)
【分类号】：TU443

【相似文献】