水泥改良泥质板岩土动力特性试验
发布时间：2019-04-10 13:00
【摘要】：针对未改良和水泥改良的泥质板岩砂土,利用振动三轴仪开展不同加载频率和围压作用下的循环振动加载试验,研究土的动弹性模量、阻尼比、动力强度和动力累积变形等参数的变化规律,对比改良土和未改良土的试验结果,分析和评价改良效果。研究结果表明:改良土的动应力与动应变关系骨干曲线为双曲线;改良土阻尼比随动应变幅值增大而增大,近似为双曲线函数关系;改良土初始动弹性模量随围压增大而增大,最大阻尼比随围压增大而减小;改良土初始动弹性模量随加载频率增大而增大,但加载频率对最大阻尼比的影响不大;改良土动应力强度和破坏振次的对数呈线性递减关系;水泥改良后,泥质板岩土的动力强度和初始动弹性模量显著提高,而最大阻尼比变化不大。改良土动力变形稳定性比未改良土的强。
[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.
【作者单位】： 中南大学土木工程学院;湖南理工学院土木建筑工程学院;
【基金】：国家自然科学基金资助项目(51308210)~~
【分类号】：U416.1
本文编号：2455818
[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.
【作者单位】： 中南大学土木工程学院;湖南理工学院土木建筑工程学院;
【基金】：国家自然科学基金资助项目(51308210)~~
【分类号】：U416.1
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