块石含量及形状对胶结土石混合体力学性能影响的大型三轴试验
本文选题：胶结土石混合体 切入点：大三轴试验 出处：《岩土力学》2017年01期
【摘要】：胶结土石混合体在自然界中分布广泛,为了揭示块石含量和块石形状对其力学特性的影响,开展了一系列室内大三轴试验研究。首先,通过掺有一定量水泥的土石混合体试样与未掺水泥的试样进行对比,以论证土石混合体有必要进一步划分为胶结土石混合体和无胶结土石混合体。然后,针对胶结土石混合体设计并进行了不同块石含量和块石形状的对比试验。最后,对胶结土石混合体力学特性的块石含量和块石形状效应进行了分析探讨。结果表明:水泥掺入比为3%的土石混合体试样较未掺水泥的试样强度和模量均有大幅提高,有明显的应变软化和局部化剪切带;在给定条件下,胶结土石混合体的峰值强度和脆性指数均随含石量的增加而减小;当含石量为40%时,块石为碎石的胶结土石混合体试样与块石为卵石的试样相比峰值强度略低,而残余强度略高;而当含石量为70%时,无论是峰值强度还是残余强度,块石为碎石的试样均比块石为卵石的试样大,围压较大时尤为明显。
[Abstract]:Cemented soil-rock mixture is widely distributed in nature. In order to reveal the influence of mass content and shape on its mechanical properties, a series of laboratory triaxial tests were carried out. By comparing the soil-rock mixture with a certain amount of cement with or without cement, it is proved that it is necessary to further divide the soil-rock mixture into cemented soil-rock mixture and non-cemented soil-rock mixture, and then it is necessary to divide the soil-rock mixture into cemented soil-rock mixture and non-cemented soil-rock mixture. According to the design of cemented soil-rock mixture, the contrast tests of different rock mass content and rock shape are carried out. The mass content and shape effect of cemented soil-rock mixture are analyzed and discussed. The results show that the strength and modulus of soil-rock mixture with cement ratio of 3% are greatly improved than that of uncement. There are obvious strain-softening and localized shear bands, the peak strength and brittleness index of cemented soil-rock mixture decrease with the increase of rock content under given conditions, and when the rock content is 40%, the peak strength and brittleness index of cemented soil-rock mixture decrease with the increase of rock content. The peak strength and residual strength of cemented soil-rock mixture specimens with aggregate rock as gravel are slightly lower than those of gravel samples, while the residual strength is slightly higher when the rock content is 70, whether it is peak strength or residual strength, The samples with crushed stones are larger than those with pebbles, especially when the confining pressure is high.
【作者单位】： 武汉大学土木建筑工程学院;
【基金】：国家自然科学基金项目(No.41272342)~~
【分类号】：TU411
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