基于激光扫描的细观混凝土模型  

Meso-concrete modeling based on laser scanning technology

作　　者：张龙飞 谢浩 陈燕伟 李二强 冯吉利[1] ZHANG LongFei;XIE Hao;CHEN YanWei;LI ErQiang;FENG JiLi(State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Jinan Rail Transit Group Co.,Ltd.,Jinan 250014,China;School of Qilu Transportation,Shandong University,Jinan 250002,China;School of Civil Engineering,Luoyang Institute of Science and Technology,Luoyang 471000,China)

机构地区：[1]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083 [2]济南轨道交通集团有限公司,济南250014 [3]山东大学齐鲁交通学院,济南250002 [4]洛阳理工学院土木工程学院,洛阳471000

出　　处：《中国科学：技术科学》2022年第7期1121-1133,共13页Scientia Sinica(Technologica)

基　　金：国家重点研发计划(编号:2016YFC0600901);国家自然科学基金(批准号:41172116,U1261212)资助项目。

摘　　要：将激光扫描技术与发展的状态点阵骨料投放算法相结合,实现了三维、二维细观混凝土几何建模.三维模型的构建通过激光扫描仪对骨料进行信息采集进而构建骨料库,结合骨料投放算法,构建出反映真实骨料形态、分布和级配等特征的三维混凝土细观模型.二维模型的构建仅需对三维模型进行剖切.激光扫描技术能给出骨料的空间真实形态,骨料库的构建保证了骨料的随机多样性,骨料投放算法则将整个建模过程程序化.为了验证该方法,选取典型切面构造二维模型,结合室内实验,利用内聚力模型研究了骨料空间分布对混凝土单轴压缩破坏的影响规律.This contribution focuses on the construction of a 3D or 2D mesoscopic concrete model using laser scanning technology and the state dot-matrix method of aggregate placement.First,a 3D laser scanner was used to collect geometry information from real aggregates to create an aggregate library.The aggregates were then randomly selected from the aggregate library and placed according to the Fuller grading curve in order of reduction to produce a 3D mesoscopic concrete model.By cutting the 3D geometry model,a simplified twodimensional plane geometry model was obtained.One of the benefits of laser scanning technology is that it ensures the realistic morphology of various aggregates while ensuring that the aggregate library perfectly meets the fundamental requirement for the construction of mesoscopic concrete models.Furthermore,the current aggregate placement algorithm allows for the efficient and rapid establishment of a concrete geometry model with microstructure.Finally,combined with the laboratory experiments of concrete,the influence of aggregate distribution on the failure mechanism of concrete was studied by the finite element method with the cohesive zone model under uniaxial compressions.

关 键 词：激光扫描 骨料 细观混凝土 骨料投放算法 内聚力模型 

分 类 号：TU528[建筑科学—建筑技术科学]