第三系粉砂质泥岩风化特性

《第三系粉砂质泥岩风化特性》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、ReV1ew第三系粉砂质泥岩风化特性吴启红’，徐青，彭振斌’，彭文祥’，尹泉’1．中南大学地学与环境工程学院．长沙4100832．江苏省地质调查研究院，南京210018摘要为研究第三系粉砂质泥岩的风化特性，通过不同的试验，对不同风化程度的粉砂质泥岩岩体分别进行工程特性、风化耐久性和风化速度研究。通过测试风化岩体的矿物成分、化学成分及物理力学性质来对其工程特性进行研究：通过抗压强度试验、软化崩解性试验对其风化耐久性进行研究；通过对所处4种不同环境的风化岩石的观测试验来对其风化速度进行研究。试验结果表明：随着岩体风

2、化程度的加深，岩石中黏土矿物含量增加，活动性强的化学成分相对减少，岩石干密度降低、总孔隙度和吸水率增大，力学性能降低。岩体更容易软化崩解。岩石的风化速率与自身的风化状态和暴露的面积有关。关键词第三系；泥质粉砂岩；工程特性；风化耐久性；风化速度中圈分类号P642．3文献标识码A文章缩号1000-7857(2010)06—0065-04StudyontheWeatheringCharacteristicsofTertiaryPeliticSiltstoneWUQihong，XUQing，PENGZhenbin，PE

3、NGWenxiang，YINQuan1．SchoolofGeoscienceandEnvironmentEngineering)；CentrdSouthUniversit),Changsha410083,China2．GeologicalSurveyof~angsuProvince，Nanjing210018,ChinaA阳cITostudytheweatheringcharacteristicsoftertiarypeliticsihstone．eachsiltymudstonewithdifferentwe

4、atheringdegreesisanalyzedinmanydifferentexperimentations．Theresearchingfieldsinvolveitsengineeringcharacteristics，weatheringdurabilityandweatheringspeed．Theengineeringcharacteristicswererevealedbytestingmineralcomposition，chemicalcompositionandmechanicalprop

5、ertiesofrockmasswithdifferentweatheringdegrees．Theweatheringdurabilitywasshownbytestingcompressivestrengthandslakedurabilityofdiferentrocksamples．Theweatheringspeedwasdeterminedinfourdiferentexperimentalconditionsfortheweatheringrock．Thetestresultsshowthatwi

6、ththegrowthofweatheringdegreeoftherocknlass，thecontentofclaymineralsintherockmassincreases，thechemicalcompositionwithhighactivityintherockmassdecreasesrelatively，thedrydensityofthesiltymudstonedecreases，thetotalporosityandthewaterabsorptionrateofthesiltymuds

7、toneincreases，themechanicalpropertiesareweakened，andtherockmassbecomeseasytosoftenandcollapse．Atthesametime，theweatheringspeedoftherockmassisrelatedtotheweatheringdegreeandtheexposedareaoftherockmass．Theresearchfindingsprovidesometheoreticalbasisforunderstan

8、dingtheTertiaryPeliticSihstoneandsolvingrelatedproblemsinpracticalengineering．Keywordstertiary；siltymudstone；engineeringcharacteristics；weatheringdurability；weatheringspeed0引言矿物多呈片状，铁质物多沿近平行的微细裂