發(fā)布時間：2018-04-03 15:22

  本文選題：飽和尾粉土　切入點：循環(huán)應力比　出處：《巖土工程學報》2017年11期

【摘要】：為了研究累積塑性應變增長方式與能量耗散的關(guān)系,從機理方面進一步細化累積塑性應變增長方式�；陲柡臀卜弁猎�3種孔隙比條件下不同循環(huán)應力比的固結(jié)不排水循環(huán)剪切試驗,改進傳統(tǒng)能量耗散計算方法,依據(jù)塑性應變累積能量耗散與黏滯累積能量耗散的關(guān)系對累積塑性應變增長方式進行了重新分類,并從能量耗散機理上闡述累積塑性應變的開展。研究結(jié)果表明:隨著循環(huán)應力比增大,黏滯累積能量耗散速率將逐漸超越塑性應變累積能量耗散速率。將累積塑性應變增長形式細分為4類:穩(wěn)定型、穩(wěn)定破壞型、破壞型、和崩塌型。同時認為塑性應變累積能量耗散的產(chǎn)生是由于砂粒、粉粒等較大顆粒發(fā)生顆粒重排,而黏滯累積能量耗散的產(chǎn)生是由于黏粒、膠粒等較小顆粒間雙電離子層內(nèi)弱結(jié)合水發(fā)生脫離,粒間發(fā)生相對滑移。上述能量耗散機理與建立的累積塑性應變增長方式分類相一致,為進一步研究累積塑性應變模型提供研究基礎。
[Abstract]:In order to study the relationship between cumulative plastic strain growth mode and energy dissipation, the mechanism of cumulative plastic strain growth mode is further refined.Based on the consolidation undrained cyclic shear tests of saturated tailings under three different void ratios, the traditional calculation method of energy dissipation is improved.According to the relationship between cumulative energy dissipation of plastic strain and cumulative energy dissipation of viscous strain, the growth modes of cumulative plastic strain are reclassified, and the development of cumulative plastic strain is expounded from the mechanism of energy dissipation.The results show that the viscous cumulative energy dissipation rate will exceed the plastic strain cumulative energy dissipation rate with the increase of cyclic stress ratio.The accumulative plastic strain growth forms are divided into four types: stable type, stable failure type, failure type and collapse type.At the same time, it is considered that the generation of cumulative energy dissipation of plastic strain is due to particle rearrangement of sand and silt particles, while the cumulative energy dissipation of viscous strain is caused by clay particles.The weak bound water in the double electric ion layer is separated and the relative slippage occurs between the smaller particles such as colloidal particles.The energy dissipation mechanism mentioned above is consistent with the classification of cumulative plastic strain growth mode, which provides a basis for further study of cumulative plastic strain model.
【作者單位】： 華南理工大學土木與交通學院;華南理工大學亞熱帶建筑科學國家重點實驗室;廣東省重工建筑設計院有限公司;
【基金】：亞熱帶建筑科學國家重點實驗室自主研究課題項目(2015ZC20)
【分類號】：TU43

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本文編號：1705771