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1、第25卷第12期巖石力學(xué)與工程學(xué)報(bào)Vol.25No.122006年12月ChineseJournalofRockMechanicsandEngineeringDec.，2006巖體節(jié)理平均跡長和跡線中點(diǎn)面密度估計(jì)楊春和，包宏濤，王貴賓，梅濤(中國科學(xué)院武漢巖土力學(xué)研究所，湖北武漢430071)摘要：在現(xiàn)場(chǎng)節(jié)理調(diào)查中，采用圓形窗口直接進(jìn)行節(jié)理調(diào)查并不實(shí)用。將所有的跡線類型設(shè)計(jì)成統(tǒng)一的數(shù)據(jù)結(jié)構(gòu)，讀取現(xiàn)場(chǎng)測(cè)量的數(shù)據(jù)；然后在生成的節(jié)理跡線圖上布置圓形取樣窗口。根據(jù)測(cè)量數(shù)據(jù)的具體情況調(diào)整圓形取樣窗口的位置、數(shù)量和半徑，同時(shí)判斷并記錄每個(gè)圓形取樣窗口對(duì)應(yīng)的各種跡線類型的數(shù)量。利用圓形窗口法原理
2、，在估計(jì)節(jié)理跡線平均長度的同時(shí)計(jì)算出節(jié)理跡線中點(diǎn)面密度。對(duì)于實(shí)際測(cè)量數(shù)據(jù)，節(jié)理跡線中點(diǎn)并非均勻分布，選擇恰當(dāng)?shù)膱A形窗口位置和半徑，才能得出合理的結(jié)果。采用同心圓法和相切圓法對(duì)岌岌采石場(chǎng)巖體節(jié)理的平均跡長和跡線中點(diǎn)面密度進(jìn)行估計(jì)，分析表明采用相切圓法能夠得出穩(wěn)定且具有一致性的結(jié)果。利用該法計(jì)算出中國高放廢物處置庫甘肅北山預(yù)選區(qū)域岌岌采石場(chǎng)斷裂兩側(cè)露頭的平均跡長和跡線中點(diǎn)面密度，分析斷裂對(duì)兩側(cè)巖體節(jié)理影響的范圍。關(guān)鍵詞：巖石力學(xué)；巖體節(jié)理；圓形窗口法；平均跡長；跡線中點(diǎn)面密度；斷裂影響范圍中圖分類號(hào)：TU452文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1000–6915(2006)12–2475–06E
3、STIMATIONOFMEANTRACELENGTHANDTRACEMIDPOINTDENSITYOFROCKMASSJOINTSYANGChunhe，BAOHongtao，WANGGuibin，MEITao(InstituteofRockandSoilMechanics，ChineseAcademyofSciences，Wuhan，Hubei430071，China)Abstract：Circularsamplewindowmethodisnotapplicableforjointsurveyinginfield.Auniformdatastructureisdesignedfo
4、rjointdataofalltracetypes.Thejointtracemapisdrawnaccordingtofieldsurveyingdata，andcircularsamplewindowsarearrangedonthejointtracemap.Theposition，quantityandradiusofthecircularwindowsareadjustedtothespecificconditionsofsurveyingdata.Simultaneously，thequantityofdifferenttracetypesinthesamecircle
5、isidentifiedandrecorded.Basedonthecircularsamplewindowmethodtheory，thetracemidpointdensityofjointisobtainedtoestimatethemeantracelength.Thedistributionofthetracemidpointisnotuniform，anditisfarfrombeinginsignificantforreasonableresultsthatpositionandradiusofcircularsamplewindowareselectedapprop
6、riately.ConcentriccirclemethodandtangentcirclemethodareappliedtoestimatingthemeantracelengthandthetracemidpointdensityinJijiquarry.Itindicatesthattangentcirclemethodisstableandreasonable.Thejointdata，whicharesurveyedinthecandidateregionofhighradioactivewasteinBeishanMount，GansuProvince，China，a
7、reanalyzedwithtangentcirclemethod.Asaresult，theinfluencerangeofthefaultisconcludedbyanalyzingthemeantracelengthandthetracemidpointdensityofjointonthebothsidesofthefault.Keywords：rockmechanics；rockmassjoint；circularsamplewindowmethod；mea
