Q_2黄土浸水前后微观结构变化研究.pdf

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1、第34卷第5期岩土力学Vl01．34NO．52013年5月RockandSoilMechanicsMav2013文章编号：1000-7598(2013)O5—1319一O6Q2黄土浸水前后微观结构变化研究方祥位一，申春妮，汪龙，陈正汉，成培江(1．后勤工程学院岩土力学与地质环境保护重庆市重点实验室，重庆401311；2．重庆交通科研设计院有限公司，重庆4000673．重庆科技学院建筑工程学院，重庆401331)摘要：对陕西蒲城电厂Q黄土浸水前后的试样进行微观结构对比测试，得到了大量珍贵的微观结构图片。浸水前后Q：黄土的微观结构定性、定量分析表明：架空孔隙受力作用影响较大

2、，对水的作用敏感；粒间孔隙对压力和水的作用相对较迟钝；Q黄土的湿陷峰值压力大于200kPa。随着压力的增大，Q2黄土的灰度熵、欧拉数和孔隙的面积比例、圆形度、定向度、分布分维减小；而颗粒的面积比例、圆形度、定向度、分布分维将增大；随着水的浸入，各量将继续减小或增大；浸水后孔径大于20um的孔隙含量减少，孔径小于20jam的孔隙含量增加，湿陷的过程中大部分孔隙都在发生变化，大孔隙变成中、d,SE隙，中、小孔隙则变为更小的孔隙。浸水前后微观结构的变化能较好地解释Q黄土特殊的湿陷性。关键词：Q2黄土；浸水；微观结构；湿陷性中图分类号：Tu444文献标识码：AResearcho

3、nmicrostructureofQ2loessbeforeandafterwettingFANGXiang—wei一，SHENChun—ni，WANGLong，CHENZheng—han，CHENGPei-jiang(1．ChongqingKeyLaboratoryofGeomechanics&GeoenvironmentProtection，LogisticalEngineeringUniversity,Chongqing401311，China；2．ChongqingCommunicationsResearch＆DesignInstitute，Chongqing4

4、00067，China；3．DepartmentofArchitecturalandCivilEngineering，ChongqingUniversityofScienceandTechnology,Chongqing401331，China)Abstract：ThemicrostructurechangesofQ2loessinPuchengpowerplant，ShaanxiprovincebeforeandafterwettingarestudiedbyusingQuantaESEM(environmentscanningelectronmicroscope)．

5、Alotofmicrostructurepicturesareobtained．ThemicrostructurequalitativeanalysisresultsofQ2loessbeforeandafterwettingwithdiferentpressuresshowthattheintra-particleporesaremoresensibletopressureandwaterthaninter-particlepores．ThemaximumpressureofcollapsibilityofQ2loessismorethan200kPa．Thearea

6、proportion，theroundness，theorientationandthedistributionfi'actaldimensionofpore，theayentropy,theEulervaluedecreasewithincreaseofpressureandwetting；however,theareaproportion，theroundness，theorientationandthedistributionfractaldimensionofparticleincreasewithpressureandwetting．Thequantities

7、ofporeswithdiametergreaterthan20gmduringwetting；whilethequantitiesofporeswithdiameterlessthan20umtheporecontentincreasesduringwetting．Mostporeschangeduringweting；thelargeporesturnintomediumandsmallpores；themediumandsmallporesturnintosmallerpores．Thepeculiarcollapsibilityo