本文選題：統(tǒng)計(jì)損傷理論 + 鄧肯—張模型�。� 參考：《水利水電技術(shù)》2017年04期

【摘要】：由于鄧肯—張EB模型沒有考慮顆粒破碎損傷對(duì)材料變形及強(qiáng)度的影響,不能模擬堆石料應(yīng)變軟化的缺陷,故將統(tǒng)計(jì)損傷理論引入鄧肯—張雙曲線模型。通過探討堆石料應(yīng)力—應(yīng)變曲線不同階段損傷變量的規(guī)律,描述堆石料的損傷破碎過程,考慮其損傷閾值的影響,建立了鄧肯—張修正模型表達(dá)式,該模型參數(shù)能通過試驗(yàn)數(shù)據(jù)擬合得出。經(jīng)過驗(yàn)證,鄧肯張修正模型在高圍壓下能較好的模擬堆石料破碎損傷的全過程,低圍壓下退化為常規(guī)鄧肯—張模型。與傳統(tǒng)鄧肯—張模型、統(tǒng)計(jì)損傷模型、彈塑性模型及試驗(yàn)結(jié)果相比較,其形式簡單、參數(shù)少。研究成果可應(yīng)用于底部圍壓較大的高堆石壩分析,為堆石壩的設(shè)計(jì)計(jì)算提供參考。
[Abstract]:The statistical damage theory is introduced to the Duncan-Zhang hyperbolic model because the Duncan-Zhang EB model does not consider the effect of particle breaking damage on the deformation and strength of materials and can not simulate the defect of strain softening of rockfill. Through discussing the law of damage variable in different stages of stress-strain curve of rockfill, describing the damage and breaking process of rockfill, considering the influence of damage threshold, the modified model expression of Duncan Chang is established. The model parameters can be obtained by fitting the experimental data. It is proved that Duncan's modified model can simulate the whole process of rockfill damage under high confining pressure and degenerate into conventional Duncan's-Zhang model at low confining pressure. Compared with the traditional Duncan-Chang model, the statistical damage model, the elastoplastic model and the experimental results, the form is simple and the parameters are less. The research results can be applied to the analysis of high rockfill dams with high bottom confining pressure and provide reference for the design and calculation of rockfill dams.
【作者單位】： 中國農(nóng)業(yè)大學(xué)水利與土木工程學(xué)院;南水北調(diào)中線干線工程建設(shè)管理局;
【基金】：國家自然科學(xué)基金青年基金項(xiàng)目(51309224)
【分類號(hào)】：TV41

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