%0 Journal Article
%T 库车东部碎屑岩地层曲率对裂缝发育的影响<br>Influence of Layer Curvature on the Fracture Growth of Clastic Rock in East Kuqa
%A 赵文韬
%A 侯贵廷
%A 鞠玮
%A 任康绪
%J 北京大学学报（自然科学版）
%D 2015
%R 10.13209/j.0479-8023.2015.066
%X 摘要 为了研究地层曲率对构造裂缝发育的控制作用, 以库车东部中？下侏罗统至三叠系碎屑岩地层为例, 选取其中3 个褶皱或与断层相关褶皱(比尤勒包谷孜背斜、克孜勒努尔沟断层转折褶皱和阳霞煤矿牵引褶皱)为测量剖面, 进行构造裂缝面密度测量和地层曲率统计。结果表明: 地层曲率会影响构造裂缝的发育程度, 在同一地层中, 曲率大的位置比曲率小的更容易发育裂缝, 并且裂缝密度与地层曲率之间呈正线性关系。从固体力学角度对地层曲率影响裂缝发育的力学机制进行探讨, 认为裂缝密度与应力分布密切相关, 而应力与曲率呈正比例关系, 因此裂缝密度与地层曲率呈线性关系, 此结论对于弹性和塑形挠曲都成立。<br>Abstract In order to study the distribution of fractures controlled by layer curvature, fold and fault-related folds in East Kuqa, including one anticline (Biyoulebaoguzi Anticline profile), one fault-bent fold (Kezilenuergou Faultbent Fold profile) and one drag fold (Yangxia Coal-mine Drag-fold profile), are selected as investigating profile, and density of their structural factures and the layer curvature of middle-lower Jurassic and Triassic are measured. The result shows that the layer curvature has an effect on the fracture density; structural fractures are easier to be developed in the layers with larger curvature compared with those with smaller one within the same stratum. Besides, there is a positive linear relationship between fracture density and layer curvature. The mechanics of layer curvature’s effect on structural fracture from angle of solid mechanics is discussed: fracture density is tightly related to stress distribution, and stress is proportional to curvature in bent beam model; hence, a positive linear relationship exists between the fracture density and layer curvature, which is applied to both elastic and plastic folds.
%K 曲率
%K 构造裂缝
%K 库车东部
%K 裂缝面密度
%K 力学机制&lt
%K br&gt
%K words curvature
%K structural fracture
%K Eastern Kuqa
%K fracture density
%K mechanical mechanism
%U http://xbna.pku.edu.cn/CN/abstract/abstract2876.shtml