摘要
针对藏区某水利工程,为准确地反演其所在区域地应力,建立了拟建坝址区的三维边坡模型,较全面地提出了8种应力施加方案,对提出的各种应力施加方案一一进行验算比较,找到各种方案中可利用的价值,最终较合理地提出了中、下坝址最佳的应力施加模型;对中、下坝址的模型进行的三维地应力反演结果与实测值进行对比,吻合性较好;利用测点所在剖面模型进行了3种应力施加方案下的二维地应力反演,将二维地应力反演结果与三维地应力反演结果进行对比,总体趋势较为一致;对自重和地应力情况进行了测点、不同深度和高度观察点、等值线的横向和纵向的对比,研究结果表明在高陡边坡、高地应力地区考虑地应力在工程实践中的影响具有很大的必要性.论文提出的地应力反演方法相比传统的地应力回归计算方法而言,具有简单适用、方便快捷、可信度高等特点,可为高地应力地区的地应力反演提供一定的参考.
According to a water project for the southwest,we establish a three-dimensional slope model for the proposed dam site to accurately inverse the ground stress in the region.Comprehensively putting forward eight kinds of stress schemes,we finally choose the most rational ones for dam sites in the middle and down streams after making comparisons among all stress schemes.When compared to the monitoring data,the calculation results of the selected three-dimensional models have good conformity.Then we use the profile models of relevant measuring points under three kinds of stress schemes to inverse the two-dimensional ground stress.The calculation shows that the two-dimensional inversion result is in line with the three-dimensional ones'.Starting from different aspects,for example,the measuring points,the observation points in variety depths and heights,we make lateral and longitudinal contrasts for deadweight and ground stress,which suggests that it is necessary to take the effects of ground stress into consideration in high and steep slops and high field stress areas.Compared to traditional methods for ground stress inversion,the one proposed in this paper have the advantages of convenience,simple application and high reliability.This will provide a certain reference for ground stress inversion in high field stress areas.
出处
《固体力学学报》
CAS
CSCD
北大核心
2014年第S1期101-114,共14页
Chinese Journal of Solid Mechanics
基金
水利部公益基金项目(201401029)
国家自然科学基金项目(51279091),国家自然科学基金重点项目(51439003)
湖北省自然科学基金项目(2014CFB673)
三峡大学拔尖人才计划项目(KJ2014H012)
中国水利水电科学研究院流域水循环模拟与调控国家重点实验室开放研究基金项目(IWHR-SKL-2012221)
宜昌市科学技术研究与开发项目(A2012-302-03)资助
关键词
三维地应力
二维地应力
应力施加方案
反演分析
three-dimensional stress,two-dimensional stress,stress schemes,inversion analysis