摘要
所定义的构造应力面的概念为三维空间不同地点非构造应力影响消失的深度点构成的曲面。为此,对似 U形沟谷按不同沟谷宽度、山体坡度和山体高度建立三维模型,分别考虑重力、水平侧压力以及二者联合进行三维应力场有限元数值模拟,分析最大水平主压应力在空间的变化规律,并进行数学统计分析,给出构造应力面深度随上述因素变化的经验公式。研究结果表明水平侧压力和山体高度是影响构造应力面深度的主要因素,当水平侧压力随深度变化梯度与重力梯度之比等于 1 时,在沟谷谷底,构造应力面深度近似等于山体高度。
The concept of tectonic stress plane (TSP) is defined as an ideal curved plane drawn by the locations with different depths where the influence of non-tectonic stress disappears. Therefore, to U-like valleys, three-dimensional model with consideration of different factors, such as valley width, mountain slope, mountain height, gravity loading, and horizontal lateral compression, respectively, is made to conduct 3D finite element modeling research on the spatial variation law of the maximum horizontal principal compressive stress in crust. By mathematical statistics and analysis, the empirical formula is given to show the TSP depth changed with the above factors. The research shows that horizontal lateral compression and mountain height are the major factors to affect the TSP depth, and that when the ratio of the gradient of horizontal lateral compression varied with depth to the gravity gradient is obtained as one, the TSP depth is approximatelly equal to mountain height.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第23期3970-3978,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国土资源部百名优秀青年科技人才计划和国家自然科学基金(49802017)资助课题。
