深部高地应力环境下含白云母及石墨炭质板岩蠕变模型构建及其应用

来源期刊:中南大学学报(自然科学版)2021年第2期

论文作者:陈秋南 谢云鹏 贺泳超 陈正红 田伟权 周亚军 黄小城 李松

文章页码:568 - 579

关键词:隧道工程;炭质板岩;高地应力;蠕变模型;二次开发

Key words:tunnel engineering; carbonaceous slate; high geostress; creep model; secondary exploration

摘    要:为研究深部高地应力环境下含白云母及石墨炭质板岩蠕变变形规律和加速蠕变特性,开展室内40 MPa围压下分级加载蠕变试验,结合硬化损伤理论改进CVISC模型,构建可以响应加速蠕变阶段的硬化损伤蠕变模型。通过推导不同应力水平下的三维蠕变差分方程,实现新模型的FLAC3D二次开发,并对其进行验证和应用。研究结果表明:新建模型可正确反映炭质板岩试样的衰减蠕变、稳态蠕变和加速蠕变的全蠕变特性,模拟结果与室内试验蠕变曲线规律一致。应用FLAC3D中新建模型模拟实际工况,围岩变形量与现场实测数据较为吻合,拱顶沉降和水平收敛的相对误差分别为3.9%和9.4%,表明新模型具有工程适用性。研究成果可对西部地区高地应力环境下含白云母和石墨的炭质板岩隧道围岩蠕变变形提供理论参考。

Abstract: To investigate the creep deformation and accelerated creep characteristics of carbonaceous slate rich in muscovite and graphite in deep high geostress environment, a hardening damage creep model which can respond to accelerated creep stage was improved by graded loading creep test under 40 MPa confining pressure, combined with hardening damage theory. By deducing the three-dimensional creep difference equation at different stress levels, the FLAC3D secondary development of the new model was realized and verified and applied. The results show that the new model can correctly reflect the decay creep, steady creep and accelerated creep characteristics of carbonaceous slate samples in the simulation, which is consistent with the creep curve of laboratory test. By using the new model in the FLAC3D software to simulate the actual working conditions, the deformation of surrounding rock is in good agreement with the field measured data. The relative errors of vault settlement and unilateral horizontal convergence are 3.9% and 9.4%, respectively, which verifies the engineering applicability of the new model. The results provide theoretical reference for creep deformation of carbonaceous slate tunnel with muscovite and graphite under high geostress environment in western area.

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