近距离交叉隧道软岩蠕变特性研究

发布时间：2018-06-18 11:31

本文选题：岩石 + 三轴蠕变试验　；参考：《桂林理工大学学报》2017年03期

【摘要】：为研究云南某公路隧道上穿既有铁路隧道交叉段粉砂岩蠕变特性,利用TLW-2000三轴流变仪对现场试样进行了不同围压条件下的分级加载三轴蠕变试验。结果表明:在相同的偏应力条件下,围压越大,蠕变变形和瞬时变形越小;蠕变变形量随着载荷级数的增加呈现先减小,然后稳定,最后急剧增大的规律。另外,粉砂岩的起始蠕变速率随着围压的增大而减小。通过分析粉砂岩蠕变曲线的变化趋势,并考虑到蠕变过程中的损伤和硬化效应,采用非线性蠕变模型拟合实验数据。拟合结果表明非线性蠕变模型能够描述粉砂岩的蠕变特性。
[Abstract]:In order to study the creep characteristics of siltstone in the cross section of a highway tunnel in Yunnan Province, triaxial creep tests under different confining pressures were carried out by using TLW-2000 triaxial rheometer. The results show that the higher the confining pressure is, the smaller the creep deformation and instantaneous deformation are, and the creep deformation decreases with the increase of load series, then stabilizes, and finally increases sharply. In addition, the initial creep rate of siltstone decreases with the increase of confining pressure. By analyzing the variation trend of creep curve of siltstone and considering the damage and hardening effect during creep, the experimental data were fitted by nonlinear creep model. The fitting results show that the nonlinear creep model can describe the creep characteristics of siltstone.
【作者单位】：云南省公路开发投资有限责任公司;中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室;云南上鹤高速公路建设指挥部;中国科学院大学;
【基金】：云南省交通科技项目[云交科教(2016)140(A)]
【分类号】：U451.2

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