隧道围岩最大可移动块体求解及其应用  

Solutions and applications of maximum movable block in surrounding rock of tunnels

作　　者：张敏思[1,2] 杨勇[1,2] 王述红[2] 查文华 ZHANG Minsi;YANG Yong;WANG Shuhong;ZHA Wenhua(Engineering Research Center for Geological Environment and Underground Space of Jiangxi Province,East China University of Technology,Nanchang 330013,China;School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东华理工大学江西省地质环境与地下空间工程研究中心,江西南昌330013 [2]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《岩土工程学报》2024年第11期2314-2322,共9页Chinese Journal of Geotechnical Engineering

基　　金：江西省主要学科学术和技术带头人培养计划(20212BCJ23003);江西省地质环境与地下空间工程研究中心开放基金资助项目(JXDHJJ2022-006);国家自然科学基金项目(52264003,51964002);江西省“双千计划”人才资助项目(DHSQT22021002)。

摘　　要：由于结构面的隐蔽性,目前的勘察技术无法精确获取每条结构面的定位及力学参数,仅能根据出露情况获取产状信息。而结构面的定位是求解块体的关键因素,因此有必要考虑不同定位情况下结构面与开挖面的所有组合,并找到最不利情况,为工程开挖提供预测及评价。在构建节理锥的基础上,提出了一种投影平移法,实现了任意柱状开挖面上最大可移动区域的求解。在此基础上,采用离散-切割-组合方法重构了曲面块体。首先,设置一组放射状虚拟结构面对锥形块体进行切割,完成块体的单元离散;其次,在面单元分类的基础上提出了曲面切割单元的详细算法。最后对切割后的单元进行分类组合,实现了曲面块体的重构。基于VC++和OpenGL开发了三维可视化程序,通过算例和工程实例验证了算法的精度、适用性及鲁棒性。最大可移动块体程序可用于隧道走向的选择,为工程设计提供依据。Due to the concealment of the discontinuities,the current exploration technology can not accurately obtain the location and mechanical parameters of all discontinuous,but can only obtain the occurrence information according to the exposure situation.The location of the discontinuities is a key factor for generating a block,so it is necessary to consider all the combinations of the discontinuities and excavation surface,and find the most unfavorable conditions to provide prediction and evaluation for engineering excavation.Based on the construction of joint pyramids,a projection translation method is proposed to solve the maximum movable region for cylindrical excavation surfaces.The dispersing-cutting-assembling method is used to reconstruct the curve surface block.Firstly,a set of radial virtual structures are set up to cut the pyramid block to realize the dispersion of the block.Secondly,based on the classification of face elements,a detailed surface-cutting-element algorithm is proposed.Finally,the cut elements are classified and combined to realize the reconstruction of the curve surface block.A 3D visualization program is developed based on the VC++and OpenGL.The accuracy,applicability and robustness of the algorithm are verified by a numerical example and an engineering example.The maximum movable block program can be used to select the tunnel direction,providing reference for engineering design.

关 键 词：块体理论 最大关键块体 隧道工程 节理岩体 

分 类 号：TU452[建筑科学—岩土工程]