本文選題：巖石力學(xué)　切入點(diǎn)：次加載面　出處：《巖石力學(xué)與工程學(xué)報(bào)》2017年10期

【摘要】：為較準(zhǔn)確反映巖體工程在地震荷載下的響應(yīng),結(jié)合Drucker-Prager屈服準(zhǔn)則和次加載面理論,初步構(gòu)建基于Drucker-Prager準(zhǔn)則的次加載面應(yīng)力路徑模型,在此基礎(chǔ)上,除計(jì)算彈性模量的率效應(yīng)之外,還在Drucker-Prager準(zhǔn)則上考慮強(qiáng)度的率效應(yīng),提出巖石材料的動(dòng)態(tài)模型,并把該模型運(yùn)用到滇中引水香爐山隧洞中。計(jì)算結(jié)果表明,相對(duì)于Drucker-Prager準(zhǔn)則,應(yīng)力路徑模型能較好地描述玄武巖在循環(huán)荷載下體現(xiàn)的曼辛效應(yīng)和棘輪效應(yīng),由于沒有考慮率效應(yīng),表現(xiàn)出應(yīng)力 應(yīng)變曲線的斜率沒有試驗(yàn)曲線大,且累計(jì)應(yīng)變也比試驗(yàn)曲線大;在巖石循環(huán)加卸載過程中,動(dòng)態(tài)模型得出的模量上比次加載面應(yīng)力路徑模型模擬的要大,同時(shí)變形量也較次加載面應(yīng)力路徑模型要小,因此該模型能較好地反映巖石的動(dòng)態(tài)力學(xué)性質(zhì)和變形性質(zhì);相比于Drucker-Prager準(zhǔn)則下,采用動(dòng)態(tài)模型得出隧洞的左側(cè)監(jiān)測(cè)點(diǎn)和右側(cè)監(jiān)測(cè)點(diǎn)的瞬時(shí)相對(duì)變形峰值增大了0.67 cm,同樣底部和頂部以及左右兩側(cè)的永久相對(duì)變形也分別增大了0.19和0.77 cm,說明動(dòng)態(tài)模型可以較好地反映圍巖殘余大變形;巖石動(dòng)態(tài)模型相對(duì)于Drucker-Prager準(zhǔn)則和線彈性本構(gòu),更具有濾掉高頻的功能。說明該模型能很好地運(yùn)用到巖石動(dòng)力學(xué)中,同時(shí)也為準(zhǔn)確分析巖體工程在地震作用下的響應(yīng)奠定了一個(gè)很好的基礎(chǔ)。
[Abstract]:In order to accurately reflect the response of rock mass engineering under earthquake load, combined with Drucker-Prager yield criterion and sub-loading plane theory, the stress path model of sub-loading plane based on Drucker-Prager criterion is constructed preliminarily. On this basis, the rate effect of elastic modulus is calculated. Considering the rate effect of strength on the basis of Drucker-Prager criterion, a dynamic model of rock materials is proposed and applied to the Xiangushan tunnel in central Yunnan. The calculation results show that the model is relative to the Drucker-Prager criterion. The stress path model can well describe the Mansin effect and ratchet effect of basalt under cyclic loading. The slope of the stress-strain curve is not as large as the experimental curve because the rate-effect is not taken into account. In the process of cyclic loading and unloading of rock, the modulus of dynamic model is larger than that of the model of secondary loading plane stress path, and the amount of deformation is smaller than that of secondary loading plane stress path model. Therefore, the model can better reflect the dynamic mechanical properties and deformation properties of rock, compared with the Drucker-Prager criterion, The instantaneous relative deformation peak of the left and right monitoring points of the tunnel is increased by 0.67 cm, and the permanent relative deformation of the bottom and the top and the left and right sides of the tunnel is also increased by 0.19 cm and 0.77 cm, respectively, by using the dynamic model. The model can well reflect the large residual deformation of surrounding rock. Compared with Drucker-Prager criterion and linear elastic constitutive model, rock dynamic model has the function of filtering out high frequency, which shows that the model can be applied to rock dynamics. It also lays a good foundation for accurately analyzing the response of rock mass engineering under earthquake.
【作者單位】： 中國科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國家重點(diǎn)實(shí)驗(yàn)室;武漢科技大學(xué)城市學(xué)院;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)項(xiàng)目(2015CB057905) 云南聯(lián)合基金重點(diǎn)項(xiàng)目(U1402231)~~
【分類號(hào)】：TU45

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