重庆地区红层泥岩球状风化剥落特征及其形成机制  

Characteristics and mechanism of spheroidal weathering exfoliation of reded mudstone in Chongqing

作　　者：丁瑜[1,2] 周忠浩 吴立新 杨奇[1,2] 胡文静[1,2] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002 [2]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [3]重庆市地质矿产勘查开发局205地质队,重庆402160

出　　处：《中国地质灾害与防治学报》2015年第1期108-112,共5页The Chinese Journal of Geological Hazard and Control

基　　金：国家自然科学基金项目(41002100)

摘　　要：以重庆地区红层泥岩为对象,对其球状风化剥落的形貌、剥落层序、剥落层层数、剥落层厚度、剥落物形态及其堆积特征等进行了分析。调查和分析表明,泥岩球状风化是水分场、温度场有关的各种风化作用共同作用的结果,其风化剥落经历了局部变形与应力集中、风化裂隙切割、椭球化、拱形开裂与球状逐层剥落的过程。红层泥岩球状风化剥落速度快,风化球因分叉明显,稳定性差,难以长久保留。In this paper,the redbed mudstone in Chongqing is presented to study the spheroidal weathering exfoliation. Characteristics of exfoliation morphology,exfoliation sequence,exfoliation shells,shell thickness,exfoliation shape and exfoliation deposits are analyzed,respectively. Field investigation and analysis reveal that spheroidal weathering of mudstone is the product of weathering processes related to moisture and temperature fields. It also shows that spheroidal weathering exfoliation experience a process from local deformation and stress concentration,weathering-induced fracturing,ellipsoidal processing to arch cracking and hierarchical exfoliating. It is obvious that spheroidal weathering exfoliation of redbed mudstone is rapid and the mudstone corestone is too poorly stable to persist for a long time due to the apparent corestone branching and poor stability.

关 键 词：红层 泥岩 球状风化 膨胀-收缩 风化裂隙 

分 类 号：P588.22[天文地球—岩石学] P512.1[天文地球—地质学]