【摘要】：針對(duì)未改良和水泥改良的泥質(zhì)板巖砂土,利用振動(dòng)三軸儀開展不同加載頻率和圍壓作用下的循環(huán)振動(dòng)加載試驗(yàn),研究土的動(dòng)彈性模量、阻尼比、動(dòng)力強(qiáng)度和動(dòng)力累積變形等參數(shù)的變化規(guī)律,對(duì)比改良土和未改良土的試驗(yàn)結(jié)果,分析和評(píng)價(jià)改良效果。研究結(jié)果表明:改良土的動(dòng)應(yīng)力與動(dòng)應(yīng)變關(guān)系骨干曲線為雙曲線;改良土阻尼比隨動(dòng)應(yīng)變幅值增大而增大,近似為雙曲線函數(shù)關(guān)系;改良土初始動(dòng)彈性模量隨圍壓增大而增大,最大阻尼比隨圍壓增大而減小;改良土初始動(dòng)彈性模量隨加載頻率增大而增大,但加載頻率對(duì)最大阻尼比的影響不大;改良土動(dòng)應(yīng)力強(qiáng)度和破壞振次的對(duì)數(shù)呈線性遞減關(guān)系;水泥改良后,泥質(zhì)板巖土的動(dòng)力強(qiáng)度和初始動(dòng)彈性模量顯著提高,而最大阻尼比變化不大。改良土動(dòng)力變形穩(wěn)定性比未改良土的強(qiáng)。
[Abstract]:In order to study the dynamic elastic modulus and damping ratio of unmodified and cement-modified clay slate sand, the cyclic vibration loading tests under different loading frequencies and confining pressures were carried out by using vibration triaxial apparatus, and the dynamic elastic modulus and damping ratio of the soil were studied. The variation rule of dynamic strength and dynamic accumulative deformation is compared with the experimental results of improved soil and unimproved soil, and the effect of improvement is analyzed and evaluated. The results show that the relationship between dynamic stress and dynamic strain of the improved soil is hyperbolic, and the damping ratio of the modified soil increases with the increase of the amplitude of dynamic strain, which is approximately a hyperbolic function relation. The initial elastic modulus of the improved soil increases with the increase of the confining pressure, and the maximum damping ratio decreases with the increase of the confining pressure, while the initial elastic modulus of the modified soil increases with the increase of the loading frequency, but the loading frequency has little effect on the maximum damping ratio. The dynamic stress intensity and the logarithm of the failure vibration of the modified soil are linearly decreasing, and the dynamic strength and initial dynamic elastic modulus of the muddy rock and soil are significantly increased after cement modification, but the maximum damping ratio does not change much. The dynamic deformation stability of the improved soil is stronger than that of the unimproved soil.
【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(guó)家自然科學(xué)基金資助項(xiàng)目(51308210)~~
【分類號(hào)】：U416.1

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