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          華中科技大學學報(自然科學版) 2020, Vol. 48 Issue (9): 126-132 DOI10.13245/j.hust.200922

          欄目:土木工程
          層狀巖石單軸壓縮損傷本構模型研究
          史 越 , 傅鶴林 , 伍毅敏 , 鄧皇適
          中南大學土木工程學院,湖南 長沙 410075
          摘要 為揭示層狀巖石在單軸壓縮條件下的損傷演化機理,將橫觀各向同性體的柯西轉軸方程和隨機損傷理論結合,建立考慮荷載損傷的層狀巖石損傷本構模型;通過不同層理傾角炭質千枚巖的單軸壓縮試驗,驗證模型的合理性和準確性,并從細觀圖像、力學參數、破壞模式和損傷演化等角度討論炭質千枚巖的各向異性特征.研究結果表明:所建模型的理論曲線與試驗數據曲線基本相符,能夠較好地反映和預測單軸加載條件下層狀巖石的非線性力學行為;炭質千枚巖的各向異性顯著,在層理傾角從0°~90°變化的過程中,強度、峰值應變和泊松比先減小后增大,彈性模量逐漸增大,并依次產生張剪復合破壞、剪切滑移破壞和劈裂張拉破壞等三種破壞類型;不同層理傾角巖樣的損傷演化規律基本相同,損傷演化曲線均經歷了緩慢上升、快速上升和趨于穩定等3個階段,損傷演化率曲線均服從正態分布,但損傷發展速率各不相同,進而改變了材料的力學性能.這將為層狀巖體受荷損傷計算、各向異性研究、圍巖穩定性分析和巖層掘進施工等提供理論依據和技術參考.
          關鍵詞 巖石力學 ;橫觀各向同性 ;本構模型 ;損傷演化 ;單軸壓縮
          Study on damage constitutive model of layered rock under uniaxial compression
          SHI Yue , FU Helin , WU Yimin , DENG Huangshi
          School of Civil Engineering,Central South University,Changsha 410075,Chinaa
          Abstract To reveal the damage evolution mechanism of layered rock in loading process,a new damage constitutive model was established by combining the Cauchy rotation equation of transversely isotropic body and random damage theory.According to the uniaxial compression test of carbonaceous phyllite with seven different bedding angles,this damage model was verified and modified.In addition,the anisotropic characteristic of carbonaceous phyllite was discussed from the meso image,mechanical parameters,failure modes and damage evolutions.It is shown that the theoretical curve of model is consistent with the experimental data,and the nonlinear mechanical behavior of the layered rock in loading can be reflected generally by this model.During the foliation plane changing from 0° to 90°,the strength,peak strain and Poisson’s ratio decreases firstly and then increases,while the elastic modulus increases gradually,and there are three kinds failure modes can be observed in turn,including compound tensile-shear failure,shear slipping failure and tensile splitting failure.The damage evolution laws of different foliation orientations are basically same.The total damage evolution curves have experienced three stages,including slow rise,rapid rise and approaching stability.In addition,all damage evolution rate curves follow the normal distribution,but the rate of damage development are different completely,which may lead to the different mechanical property of layered rock.This study will provide references for layered rock in damage calculation,anisotropy investigation,stability analysis and engineering construction in future.
          Keywords rock mechanics ; transversely isotropic ; constitutive model ; damage evolution ; uniaxial compression
          基金資助國家自然科學基金資助項目(51978668,51578550);中央高?;究蒲袠I務費專項資金資助項目(2018zzts193)

          中圖分類號TU458
          文獻標志碼A
          文章編號1671-4512(2020)09-0126-07
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          文獻來源
          史 越, 傅鶴林, 伍毅敏, 鄧皇適. 層狀巖石單軸壓縮損傷本構模型研究[J]. 華中科技大學學報(自然科學版), 2020, 48(9): 126-132
          DOI:10.13245/j.hust.200922
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