中文摘要：

根据分形理论,利用MATLAB软件编制分形处理程序,对多次干湿循环过程中裂隙发育情况以及分形特征进行了研究,结合直剪试验,定量分析了干湿循环后分形维度与抗剪强度的关系.结果表明：在多次干湿循环过程中,分形维度与裂隙率变化规律相似,呈现出先升高后降低的趋势,最后在接近缩限含水率时趋于稳定.随循环次数增多,分形维度峰值不断增大,第2次循环增幅最大,其后逐步减小.分形维度与抗剪强度指标有很好的相关性,随着分形维度的增大,c,φ值不断减小,分形维度可以定量描述裂隙的力学效应.

英文摘要：

Based on the fractal theory, we used MATLAB software to make fractal processing program, and researched the fissure development state in the repeated dry-wet cyclic process and the fissure fractal characteristics with this program. Combining with the direct shear test, we analyzed the relationship between the fractal dimensionallty and the shear strength after the dry-wet cycle. The analytic results show that in the repeated dry-wet cycle, the change law of the fractal dimensionality is similar to that of the fissure ratio, Which shows a decrease trend after increase, and finally tends to be stable near the shrinkage limit moisture content. With the increase of cycle times, the peak of the fractal dimension is increasing, the fractal dimension of second cycle is maximum, then it is reducing. The fractal dimensionality has good relevance with the shear strength, and with the fractal dimension value increasing, the values of c and φ decrease continuously, so the fractal dimension can quantitatively describe the mechanical effects of fissure.