博碩士論文 103322104 完整後設資料紀錄

DC 欄位 語言
DC.contributor土木工程學系zh_TW
DC.creator廖明傑zh_TW
DC.creatorMing-Chieh Liaoen_US
dc.date.accessioned2017-8-9T07:39:07Z
dc.date.available2017-8-9T07:39:07Z
dc.date.issued2017
dc.identifier.urihttp://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=103322104
dc.contributor.department土木工程學系zh_TW
DC.description國立中央大學zh_TW
DC.descriptionNational Central Universityen_US
dc.description.abstract由於岩體中常伴隨節理面構造,因此使得岩體整體剪力強度不止受到岩體本身材料強度之影響,同時也受到節理面存在而可能有變化。岩石節理面之存在對於岩體剪力強度之影響,已有Barton提出之公式可推估岩體受節理面影響下之剪力強度,其中節理面粗糙度為重要之影響因素,且通常用節理面粗糙度係數(簡稱JRC)來表示岩體節理面剖面之粗糙程度。 Barton(1977)提出之視覺對照法為最早評估岩石節理剖面JRC的方法,但由於此方式較為主觀,因此近年來許多學者提出了數值量化的客觀方式來評估JRC,如利用剖面線段長度的方均根值Z2、碎形維度D,或利用線段角度的傾角擬合參數C等,希望能夠更客觀的評估JRC值。由於不同理論或假設在評估JRC上會造成某些程度之高估或是低估,因此,本研究蒐集並數位化86條岩石節理剖面(已知JRC),並對其進行統計分析,發現其剖面節理面的高程差呈現常態分佈,且其高程差之標準差與JRC值具有高度相關性。因此,藉由上述岩石節理面剖面之統計參數,本研究隨機生成了一千組新的岩石節理剖面,並使用前人所提出的各項JRC評估法進行JRC的計算並比較,以對於各JRC評估法所得值之分佈趨勢提出建議。 除此之外,本研究使用離散元素軟體PFC2D建立岩石單壓強度試驗之模型與岩石節理面之基本摩擦角直剪模型進行模擬,取得此模型之岩石力學參數後,分別對其中一組隨機生成之岩石節理剖面與Barton提出之標準剖面建立直接剪力試驗的數值模型,藉由此數值模型所得的結果與Barton(1977)提出之剪力強度經驗公式進行比較,結果發現,隨機生成之節理面的剪力力學行為與Barton之標準剖面及利用經驗公式計算出來的結果相符。zh_TW
dc.description.abstract Because the rock mass is often accompanied by the joint, the overall shear strength of the rock mass is affected not only by the strength of the material itself, but also by the existence of the joint. The influence of the existence of rock joints on the shear strength of rock mass has been proposed by Barton to estimate the shear strength of rock mass under the influence of joint. Where the joint surface roughness is an important influencing factor, and the joint roughness coefficient (JRC) is usually used to represent the roughness of the section. Barton (1977) proposed the visual comparison method for the earliest assessment of the JRC method, but because of this approach is more subjective, in recent years, many scholars have proposed numerical quantitative objective way to assess JRC. Due to different theories or assumptions in the assessment of JRC will cause some overestimation or underestimation, in this study, 86 rock joint sections (known as JRC) were collected and digitized and analyzed statistically. It is found that the elevation difference of the joint surface is normal distribution, and the standard deviation of the elevation difference is highly correlated with the JRC value. In this study, a new set of new rock joint sections was generated by the above parameters and use different JRC evaluation method for JRC calculation and comparison, and finally the JRC assessment of the distribution of the value of the trend of the proposed recommendations. In addition, we use the PFC2D to simulate the unconfined compression test of rock and the basic friction angle of rock joint direct shear test After obtaining the rock mechanics parameters of this model, the numerical model of the direct shear test was established for one of the randomly generated rock joint and the standard profile proposed by Barton. The results obtained by this numerical model are compared with the empirical formula of shear strength proposed by Barton (1977). The results show that the shear mechanics behavior of the randomly generated joints is in accordance with the Barton standard profile and the empirical formula.en_US
DC.subject岩石節理面zh_TW
DC.subjectJRCzh_TW
DC.subject隨機模擬zh_TW
DC.subjectPFC2Dzh_TW
DC.subjectRock Jointsen_US
DC.subjectJRCen_US
DC.subjectRandomly Generateden_US
DC.subjectPFC2Den_US
DC.title岩石節理面之隨機模擬與其離散元素模型之力學性質分析zh_TW
dc.language.isozh-TWzh-TW
DC.type博碩士論文zh_TW
DC.typethesisen_US
DC.publisherNational Central Universityen_US

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