本文選題：道路工程 + 損傷模型�。� 參考：《公路交通科技》2017年05期

【摘要】：針對(duì)土-結(jié)構(gòu)接觸面剪切特性,基于現(xiàn)有統(tǒng)計(jì)損傷理論提出了土-結(jié)構(gòu)接觸面剪切損傷模型及模型參數(shù)的確定方法。利用大型直剪儀對(duì)紅黏土-混凝土結(jié)構(gòu)接觸面進(jìn)行直剪試驗(yàn),分析了紅黏土-結(jié)構(gòu)接觸面上剪應(yīng)力-應(yīng)變特性。根據(jù)試驗(yàn)結(jié)果得到紅黏土-結(jié)構(gòu)接觸面剪切損傷模型的相關(guān)參數(shù),建立了基于Weibull分布的損傷模型參數(shù)與法向應(yīng)力的關(guān)系,并對(duì)模型進(jìn)行了修正。最后將理論計(jì)算結(jié)果與試驗(yàn)結(jié)果進(jìn)行了對(duì)比分析,驗(yàn)證了該模型的合理性。研究成果表明:法向應(yīng)力水平越大,黏性土-結(jié)構(gòu)接觸面剪切軟化現(xiàn)象越不顯著,應(yīng)力應(yīng)變關(guān)系由軟化型轉(zhuǎn)變?yōu)槿踯浕�。通過對(duì)接觸面直剪試驗(yàn)的成果進(jìn)行驗(yàn)證,模型計(jì)算與試驗(yàn)結(jié)果吻合較好,證明了文中提出的剪切損傷模型具有能夠充分反映土-結(jié)構(gòu)接觸面軟化特性和應(yīng)力狀態(tài)的特點(diǎn),模型參數(shù)較少。
[Abstract]:According to the shear characteristics of soil-structure interface, based on the existing statistical damage theory, the shear damage model of soil-structure contact surface and the method of determining the parameters of the model are proposed. The shear stress-strain characteristics of red clay concrete structure interface are analyzed by using a large direct shear apparatus. Based on the experimental results, the parameters of the shear damage model of the red clay structure interface are obtained. The relationship between the parameters of the damage model and the normal stress based on the Weibull distribution is established, and the model is modified. Finally, the rationality of the model is verified by comparing the theoretical results with the experimental results. The results show that the greater the normal stress level, the less obvious the shear softening of the clay soil-structure interface, and the change of the stress-strain relationship from softening type to weak softening type. Through the verification of the results of direct shear test on the contact surface, the model calculation is in good agreement with the experimental results. It is proved that the proposed shear damage model can fully reflect the softening characteristics and stress state of soil-structure interface. The model parameters are less.
【作者單位】： 中南大學(xué)土木工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51378514)
【分類號(hào)】：U416.01
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本文編號(hào)：1867566