非均質(zhì)性對(duì)巖石Ⅰ型斷裂特性影響的數(shù)值模擬研究(英文)
發(fā)布時(shí)間:2020-12-31 00:29
由于巖石的抗拉強(qiáng)度遠(yuǎn)低于其抗壓強(qiáng)度,其對(duì)拉伸荷載比壓縮荷載更加敏感。因此研究拉伸荷載下巖石的斷裂特性對(duì)于深入理解巖石的破壞機(jī)制具有重要意義。本研究中,作者利用巖石破壞過(guò)程分析系統(tǒng)RFPA,對(duì)不同均質(zhì)度巖石Ⅰ型裂紋擴(kuò)展過(guò)程展開(kāi)了研究。隨著巖石均質(zhì)程度的提高,裂紋逐漸向韌帶區(qū)域集中,并且裂紋分叉逐漸減少,主裂紋趨于平滑。當(dāng)均質(zhì)度在1.5~5區(qū)間內(nèi),巖石裂紋行為和力學(xué)性能受均質(zhì)度的影響比較嚴(yán)重。當(dāng)均質(zhì)度大于30時(shí),二者基本不受均質(zhì)度差異的影響,此時(shí)巖石可基本上認(rèn)為是均質(zhì)材料。細(xì)觀尺度上巖石力學(xué)性質(zhì)分布影響了巖石整體和局部強(qiáng)度,進(jìn)而影響了裂紋行為。
【文章來(lái)源】:Journal of Central South University. 2020年10期
【文章頁(yè)數(shù)】:15 頁(yè)
【文章目錄】:
1 Introduction
2 A brief introduction to numerical method
3 Numerical model and boundary conditions
4 Effects of rock homogeneity on crack behaviors
4.1 Cracking process
4.2 Subcritical crack length during tensile loading
4.3 R curves
5 Effects of rock homogeneity on macro-mechanical properties
5.1 Stress-strain curve and uniaxial tensile strength
5.2 Initial cracking toughness and unstable fracture toughness
5.3 Acoustic emissions and damage evolutions
6 Conclusions
Contributors
Conflict of interest
【參考文獻(xiàn)】:
期刊論文
[1]巖石非均質(zhì)度對(duì)其力學(xué)性能的影響研究[J]. 羅榮,曾亞武,曹源,黎玲. 巖土力學(xué). 2012(12)
本文編號(hào):2948589
【文章來(lái)源】:Journal of Central South University. 2020年10期
【文章頁(yè)數(shù)】:15 頁(yè)
【文章目錄】:
1 Introduction
2 A brief introduction to numerical method
3 Numerical model and boundary conditions
4 Effects of rock homogeneity on crack behaviors
4.1 Cracking process
4.2 Subcritical crack length during tensile loading
4.3 R curves
5 Effects of rock homogeneity on macro-mechanical properties
5.1 Stress-strain curve and uniaxial tensile strength
5.2 Initial cracking toughness and unstable fracture toughness
5.3 Acoustic emissions and damage evolutions
6 Conclusions
Contributors
Conflict of interest
【參考文獻(xiàn)】:
期刊論文
[1]巖石非均質(zhì)度對(duì)其力學(xué)性能的影響研究[J]. 羅榮,曾亞武,曹源,黎玲. 巖土力學(xué). 2012(12)
本文編號(hào):2948589
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