岩土力学2017，Vol.38Issue(7)：1990-1998,9.DOI:10.16285/j.rsm.2017.07.019
巴东组紫红色泥岩干湿循环崩解特征试验研究
Disintegration characteristics of red-bed mudstone of Badong Formation under wet-dry cycles
摘要
Abstract
Since various water-induced geological disasters occur in the red-bed mudstone,it is important to study disintegrating states of red-bed mudstone under dry and wet cycles.A series of wet and dry cycle tests was conducted on mudstone samples from Triassic Badong Formation.After each cycle,every group of screened particles was weighed,and morphological parameters of rock sample were also obtained using an image processing technique.With the combination of the fractal geometry theory and the gray relational analysis,the fractal characteristics of size distribution and the morphological characteristics of rock particles were gained.Thus,a new model was established to evaluate the stability of the red-bed mudstone.The results show that rock particles with a size larger than 10 mm disintegrated dramatically,which mainly occurred in former eight times cycles and tended to stop after 12 times cycles.Corresponding to the evolution of disintegration process,the fractal dimension of size distribution rapidly increased and stabilized at around 2.20 by the end of disintegration.Meanwhile,both the circularity of rock particles and the dimension of covering boxes showed correlations with disintegrating degree and eventually stabilized when the disintegration ended.From the gray relational analysis,the variation characteristics of circularity of the red-bed mudstone well reflect its disintegrating state.Therefore,the stability evaluation of the red-bed mudstone has a significant guidance in engineering construction.关键词
红层泥岩/干湿循环/崩解/分形/圆形度/稳定性评价Key words
red-bed mudstone/cyclic wetting and drying cyclic/disintegration/circularity/stability evaluation分类
建筑与水利引用本文复制引用
申培武,唐辉明,汪丁建,何成,张雅慧..巴东组紫红色泥岩干湿循环崩解特征试验研究[J].岩土力学,2017,38(7):1990-1998,9.基金项目
国家自然科学基金重点项目(No.41230637) （No.41230637）
国家重点基础研究发展计划(973计划)项目(No.2011CB710606).Project supported by the Key Program of National Science Foundation of China (41230637) and the National Program on Key Basic Research Project of China (973 Program) (2011CB710606). （973计划）
