基于数字图像测量系统的砂砾土试样膜嵌入问题研究  

STUDY ON MEMBRANE PENETRATION IN SANDY SOIL SPECIMENS BASED ON DIGITAL IMAGE MEASUREMENT SYSTEM

作　　者：孙益振[1] 邵龙潭[1] 王助贫[2] 王清明[1] 

机构地区：[1]大连理工大学工程力学系工业装备结构分析国家重点实验室,辽宁大连116024 [2]中国农业大学水利与土木工程学院,北京100083

出　　处：《岩石力学与工程学报》2006年第3期618-622,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：教育部高等学校骨干教师资助计划项目(2000-65)

摘　　要：利用数字图形测量系统可以定量研究膜嵌入问题。数字图像测量系统可以经过非接触测量方式精确得到试样的体积变化及排水管的体积变化,排水管的体积变化包括试样的体积变化和膜嵌入引起的体积变化。通过对多种砂砾试验材料在不同围压下的等向固结试验,利用平面变形假定,用排水管的体积变化减去试验固结的体积变化之后得到的就是膜嵌入量。根据试验得出的结果,分析了在一定粒径范围内膜嵌入量与其主要影响因素σ3,d50之间的关系,改进了膜嵌入量的计算公式;提出了对于含有细颗粒较多的级配砂用d50进行分析不太合理,还应考虑颗粒级配的不均匀系数的影响,或用其他特征粒径的建议。The problem of membrane penetration can be studied quantitatively based on digital image measurement system. By non-contact measurement technique of the digital image system, the precise volume changes of specimen and water pipe can be gained. The volume change of water pipe includes the specimen＇s volume change and that caused by membrane penetration. Through the drained-loading tests of some sand materials, using the planar deformation assumption, the membrane penetration is obtained by subtraction the specimen skeleton＇s volume change from the discharge pipe＇s in the process of drained-loading test. Based on the test results, the relation between the membrane penetration and its mainly influential factors, such as б3, d50, are analyzed and the formula of membrane penetration is improved. It is not reasonable for graded sand including high percentage of fine particle using ds0 to analyze the membrane penetration. The influence of gradation＇s uneven or other characteristic particle size should be taken into account.

关 键 词：土力学 膜嵌入 三轴试验 数字图像测量 

分 类 号：TU411.4[建筑科学—岩土工程]