摘要
针对江西武吉高速公路隧道的Ⅱ～Ⅴ级围岩,通过分级增量循环加卸载试验、剪切流变试验和双轴压缩流变试验研究围岩的流变特性,并对模型进行辨识.试验结果表明Ⅱ～Ⅳ级围岩具有过渡蠕变和定常蠕变过程,表现为脆性破坏;Ⅴ级围岩则具有过渡蠕变、定常蠕变和加速蠕变过程,表现为塑性破坏.通过模型辨识,采用广义Kelvin模型模拟Ⅱ～Ⅳ级围岩,采用非线性流变元件NRC模型与西原模型的串联模型模拟Ⅴ级围岩,可较好模拟围岩流变特性;同时得到与应力水平有关的围岩流变力学参数.模型辨识的方法可应用于板岩以外的其他岩石.
Circular increment step load and unload test,shear rheological test and two-axes compression test were carried out to study the rheological properties based on Ⅱ-Ⅴ grade surrounding rock of Wuji highway tunnels in Jiangxi Province.The test results show that Ⅱ-Ⅳ grade surrounding rocks contain two creep sections,namely transitionary creep and stability creep,and the failure behavior of the rocks is brittle fracture.Ⅴ grade surrounding rock contains three creep sections,namely transitionary creep,stability creep and accelerating creep,and the failure behavior of the rock is plastic yield.Ⅱ-Ⅳ grade surrounding rock can be reasonably simulated with generalized Kelvin model through the model identification,while Ⅴ grade surrounding rock agrees well with the nonlinear model.Rheological parameters related to stress level were also obtained by model identification.The method of model identification can be applied to other rock beyond slates.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第5期664-672,共9页
Journal of Tongji University:Natural Science
关键词
岩石
流变试验
模型辨识
围岩级别
rock
rheological test
model identification
rock grade
