数字照相量测在大型洞群模型试验中的应用研究  

Application of digital photogrammetric techniques in 3D model tests on large caverns

作　　者：张乾兵[1] 朱维申[1] 孙林锋[1] 郑文华[1] 

机构地区：[1]山东大学岩土与结构工程研究中心,山东济南250061

出　　处：《岩土工程学报》2010年第3期447-452,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(90510019;50579033)

摘　　要：地质力学模型试验和数值模拟方法是研究深埋、高地应力条件下大型地下洞室群围岩稳定性状况的重要方法。以双江口水电站地下洞群模型试验为研究对象,为解决洞周边墙关键点微小位移的量测问题,通过在洞周表面布置人工量测标志点和全程数字图像采集,应用PhotoInfor图像分析软件系统对洞室拱顶及边墙收敛位移进行了计算分析。获得了洞室加载与开挖过程中位移的变化过程与规律曲线。同时,利用FLAC3D软件模拟了洞群围岩的稳定性状况。研究结果表明:在大型洞群模型实验中,数字照相量测能够识别0.02 mm以下的微小位移;数值计算结果与照相量测结果规律基本吻合;数字照相量测弥补了三维模型试验中传统预埋量测仪器而破坏模型整体性的缺点,能够广泛应用在岩土工程试验之中。Geomechanical model test and numerical simulation play important roles in stability analysis of large underground caverns at great depth and under high in-situ stresses.Large-scale geomechanical model tests were carried out under true three-dimensional stress state.In order to solve the problem in measurement of small displacements in the surrounding rock masses,the digital speckle correlation method was adopted.Color marks were adhered on the model surface of the caverns,and the PhotoInfor software system was employed to calculate and analyze the vertical displacement of the crown and the convergence values of the side walls.Numerical simulation was also conducted using FLAC3D software under the same conditions,and the results of the model test and the numerical approach were compared.The study shows that the research and the application of the displacement measurement methods used in the surrounding rock masses for large-scale model tests on caverns under 3D stress field have achieved satisfactory results.

关 键 词：地质力学模型试验 位移量测 数字照相量测 数值模拟 

分 类 号：P642[天文地球—工程地质学]