本文選題：土動力學(xué) + 粗粒土�。� 參考：《湖南大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年09期

【摘要】：為研究干濕循環(huán)作用對水泥改良泥質(zhì)板巖粗粒土的動力穩(wěn)定性影響,以標(biāo)準(zhǔn)養(yǎng)護(hù)齡期達(dá)28d的水泥改良泥質(zhì)板巖粗粒土為試樣,設(shè)計(jì)干濕循環(huán)條件下的改良土大型動三軸壓縮試驗(yàn).通過試驗(yàn)研究改良土動彈性模量、阻尼比和動應(yīng)力強(qiáng)度等力學(xué)特征參數(shù)隨干濕循環(huán)次數(shù)變化的規(guī)律,分析圍壓對干濕循環(huán)效應(yīng)的影響,探討干濕循環(huán)作用的影響機(jī)理.研究結(jié)果表明:1)隨著干濕循環(huán)作用次數(shù)增加,最大動彈性模量和動強(qiáng)度均有所衰減,但衰減到一定程度后逐漸趨于穩(wěn)定;2)最大阻尼比隨著干濕循環(huán)作用次數(shù)增加而增加,但增加到一定程度后逐漸趨于穩(wěn)定;3)干濕循環(huán)作用下,圍壓越大,最大動彈性模量和動強(qiáng)度的衰減幅度越小,最大阻尼比的增加幅度也越小.
[Abstract]:In order to study the effect of dry and wet cycling on the dynamic stability of cement-modified muddy slate coarse grained soil, the cement modified muddy slate coarse grained soil with a standard curing age of 28 days was taken as the sample. A large dynamic triaxial compression test of improved soil under dry and wet cycle was designed. The variation of dynamic elastic modulus, damping ratio and dynamic stress intensity of improved soil with the times of dry and wet cycles is studied. The influence of confining pressure on the effect of dry and wet circulation is analyzed, and the mechanism of the effect of dry and wet circulation is discussed. The results show that the maximum dynamic modulus of elasticity and dynamic strength decrease with the increase of dry-wet cycle times, but tend to stabilize gradually after decreasing to a certain extent) the maximum damping ratio increases with the increase of dry and wet cycles. However, the larger the confining pressure, the smaller the attenuation amplitude of the maximum dynamic modulus of elasticity and the dynamic strength, and the smaller the increase of the maximum damping ratio.
【作者單位】： 中南大學(xué)土木工程學(xué)院;湖南理工學(xué)院土木建筑工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51308210)~~
【分類號】：TU41

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