巴东组紫红色泥岩干湿循环崩解特征试验研究

发布时间：2018-03-16 15:41

本文选题：红层泥岩　切入点：干湿循环　出处：《岩土力学》2017年07期 　论文类型：期刊论文

【摘要】：红层泥岩受水的影响易诱发多种工程地质灾害,开展红层泥岩干湿循环崩解性质的研究具有重要意义。选取三叠系巴东组(T2b4)紫红色泥岩开展室内干湿循环崩解试验,每次干湿循环后筛分试样,通过称量获得各组分质量,并用图像处理技术提取每次筛分后岩石块体的形态特征参数。以此为基础用分形几何、灰色关联理论研究红层泥岩崩解过程中颗粒的分形与形态特征,从而建立评价红层泥岩稳定程度的模型。研究结果表明:巴东组紫红色泥岩室内干湿循环崩解试验中,粒径大于10 mm的块体崩解剧烈,且崩解过程主要集中在前8次循环,经历12次循环后停止;崩解过程中红层泥岩的分布分形维数在前8次循环中增加迅速,与红层泥岩崩解程度的变化规律相对应,随红层泥岩停止崩解而稳定在2.20;各粒组颗粒圆形度与覆盖盒维数的变化特征与红层泥岩崩解程度的变化规律也具有对应关系,随其崩解的停止而逐渐趋于稳定;灰色关联结果表明:崩解过程中红层泥岩圆形度的变化特征能更好地反映其崩解的状态,对工程建设中红层泥岩稳定程度的评价具有一定的指导意义。
[Abstract]:Influenced by water, red mudstone can easily induce many kinds of engineering geological hazards. It is of great significance to study the dry and wet cycle disintegration properties of red layer mudstone. The burgundy mudstone of Padong formation of Triassic is selected to carry out indoor dry and wet cycle disintegration test. After each dry and wet cycle, the samples were screened, and the mass of each component was obtained by weighing, and the morphological characteristic parameters of the rock mass after each screening were extracted by image processing technique. Based on this, fractal geometry was used. The grey correlation theory studies the fractal and morphological characteristics of particles in the process of red mudstone disintegration, and establishes a model to evaluate the stability of red mudstone. The results show that: in the laboratory dry and wet cycle disintegration test of red mudstone in Badong formation, The disintegration of blocks with diameter larger than 10 mm is violent, and the disintegration process is mainly concentrated in the first 8 cycles, and stops after 12 cycles, and the fractal dimension of the distribution of red layer mudstone increases rapidly in the first 8 cycles. Corresponding to the regularity of the collapse degree of the red mudstone, it is stable at 2.20 with the red mudstone disintegrating, and the variation characteristics of the granularity roundness and the covering box dimension also have the corresponding relation with the change law of the red mudstone disintegration degree. The grey correlation results show that the variation characteristics of the roundness of red mudstone can better reflect the disintegration state of the red mudstone. It has certain guiding significance to evaluate the stability of red bed mudstone in engineering construction.
【作者单位】：中国地质大学(武汉)工程学院;
【基金】：国家自然科学基金重点项目(No.41230637) 国家重点基础研究发展计划(973计划)项目(No.2011CB710606)~~
【分类号】：TU45

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