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时间:2020-03-25
《微环境对龙游石窟粉砂岩风化的影响.pdf》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、JournalofEngineeringGeology工程地质学报1004-9665/2010/18(5)一0742—06微环境对龙游石窟粉砂岩风化的影响:l:张中俭①张路青①李丽慧①王学良①傅燕②李粉霞③(①中国科学院工程地质力学重点实验室中国科学院地质与地球物理研究所北京100029)(②浙江省龙游石窟研究所龙游324400)(③南方医科大学生物技术学院广州510515)摘要通过龙游石窟2号洞离洞口较近的洞内围岩的风化程度比离洞口较远的洞内围岩的风化程度更为严重的事实来论证微环境对粉砂岩风化的影响。为了描述围岩风化的严重程度,利用橡皮泥压模法对龙游石窟2号洞洞口附近围岩
2、和洞内围岩的凿痕深度进行了量测。量测结果表明,洞内围岩凿痕的最大高差和最大起伏度的平均值分别为10.2ram和0.43。与之相比,洞口附近围岩凿痕的相应值都较小,分别为8.0mm和0.35。以上数据说明洞口围岩凿痕的风化深度较大,粗糙程度较小,被“磨平”的趋势更严重。作者认为,2号洞洞口附近和洞内的微环境差异(主要包括降水、温度、光照和苔藓等)造成了上述围岩风化程度的差异。关键词微环境地下洞室风化程度风化深度粉砂岩中图分类号:P642文献标识码:AINFLUENCEoFMICRo.ENVIRoNMENTToPELITICSILTSTONEASSURRoUNDINGRoCKo
3、FLoNGYoUUNDERGROUNDCAVERNSZHANGZhonNian①ZHANGLuqing①LILihui①WANGXueliang①FUYan②LIFenxia③(O)KeyLaboratoryofEngineeringGeomechanics,InstituteofGeologyandGeophysics,ChineseAcademyofSciences,Beijing100029))((~Instituteof~ongyouGrottoes,Longyou324400)(~SchoolofBiotechnology,SouthernMedicalUnive
4、rsity,Guangzhou510515)AbstractFivecomp1atecavernswereun—wateredanddiscoveredinLongyouinJune1992.TheyweremanuallycavedinsihstoBeatshallowdepthsmorethan2000yearsago.AstimegoesOil,weatheringofthesurroundingrockofthecavernsisincreasingseverely.Thefactthattheweatheringdegreeofthesurroundingrock
5、nearbytheen_trance0ftheN0.2cavernismoreseriousthanthatinsidetheNo.2cavernareexplainedwiththeweatheringdifer—enceoftheDeliticsihstoneduethedifferenceinthemicro.environments.Thedepthsofthechiselmarksofthesur—mundingr0cknearbytheentranceandinsidethecavernNo.2weremeasuredusingplasticene.Thecor
6、espondingcurvesofchise1markdepthswereobtained.Accordingtothemeasuredresults,themeanvaluesofthemaximumhighrecessionandthemaximamfluctuationratioofthechiselmarksinsidethecavernis10.2mmand0.43re。sDectivelv.Thec0respondingvaluesofthechiselmarknearbytheentrancearesmaller.Theirmeanvaluesare8.0mm
7、and0.35respectively.Theabovevaluesindicatethattheweatheringdegreeofchiselmarksnearbytheeli’trancearelargerthanthatinsidethecavern.Itisbelievedthattheabovediferenceintheweatheringdegreeis收稿日期:2010—01—14;收到修改稿日期:2010—04—08.基金项目:国家自然科学基金资助(40672190;40902088),龙游石窟
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