基于数字地形模型土微结构三维孔隙度的计算方法  

Computation method on 3D porosity of soil microstructure based on digital terrain model

作　　者：袁则循[1,2] 毛灵涛[1,3] 赵丹[1] 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]北京城市学院培训中心,北京100083 [3]中国矿业大学煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《辽宁工程技术大学学报（自然科学版）》2011年第5期734-737,共4页Journal of Liaoning Technical University (Natural Science)

基　　金：国家重点基础研究发展计划"973"基金资助项目(2010CB732002);教育部博士点新教师基金资助项目(20070290010);中央高校基本科研业务费基金资助项目(2009QM02)

摘　　要：为了充分利用SEM图像中蕴含的三维信息,反映土样内部孔隙特性,提出了利用数字地形模型(DTM)计算三维孔隙度的方法,该方法无需选取阀值对图像进行分割,避免了由于阀值选取引起的统计误差。利用该方法计算了天津港某杂货码头不同深度土样的孔隙度,并与压汞法、土工实验方法和基于图像二维孔隙度的计算结果进行了对比分析,结果表明:以住图像二维孔隙度只反映了孔隙结构一个剖面的孔隙度,与其他方法结果相差较大,而DTM法计算结果与压汞法、土工实验方法所得的结果相近,反映了土样的三维孔隙度的实际情况。该方法对进一步研究土样内部三维结构具有一定的参考价值。In order to fully utilize the 3D information in scanning microscope image,in particular,the internal porosity characteristics of soil samples,a method for calculating 3D porosity based on Digital Terrain Model（DTM） is proposed in this study.This method makes the threshold become unnecessary and avoids the statistical errors caused by the threshold.A case study at a cargo dock in Tianjin port was conducted using the proposed method.Comparing with mercury intrusion method,geotechnical test and previous 2D porosity calculation method based on SEM image,previous 2D porosity method reflecting the porosity in one section is different from the other methods,and the threshold has great effect on the result.The porosity calculation result with 3D method is in agreement with the results from mercury intrusion method and geotechnical test,which reveal the actual characteristics of pore.The proposed method is useful for further study on the internal 3D structure of soil.

关 键 词：岩土工程 土的微结构 数字地形模型 三维孔隙度 SEM图像 压汞法 土工实验法 二维孔隙度 

分 类 号：TU411[建筑科学—岩土工程]