长江科学院院报2016，Vol.33Issue(10)：67-71,5.DOI:10.11988/ckyyb.20150832
软岩隧道锚变形破坏机理缩尺模型试验研究
Scale Model Test on the Deformation and Failure Mechanism of Tunnel-type Anchorage Surrounded by Soft Rock
周火明 1李维树 1王帅 2吴相超 1王中豪1
作者信息
- 1. 长江科学院 重庆分院，重庆 400026
- 2. 长江科学院 水利部岩土力学与工程重点实验室，武汉 430010
- 折叠
摘要
Abstract
To study the failure mechanism and failure mode of tunnel -type anchorage at soft rocks, overloading fail-ure test was conducted through 1 ∶10 scale field model of tunnel-type anchorage.The surface deformation and inter-nal deformation, the results of borehole inclinometers and the cracks of tunnel -type anchorage model in the overloa-ding process were analyzed.The deformation-load curve and the characteristics of deformation failure of tunnel -type anchorage model under thrust were obtained .Furthermore, the results were comprehensively analyzed in association with numerical simulation results.Research results showed that: similar with the deformation failure of soft rock un -der loading test, the whole process of the deformation failure of tunnel -type anchorage model experienced three sta -ges.Destructive bottom boundary was formed by tension -shear between the bottom of anchorage and contact area of rocks.Due to upward extrusion, longitudinal tensile cracks of rocks above the anchorage and shear fractures with angle of about 45 degrees to the anchorage were formed.The ultimate bearing capacity of tunnel -type anchorage is mainly decided by the tensile capacity and shear capacity of rocks on the bottom boundary and top of the anchorage .关键词
隧道锚/缩尺模型试验/数值模拟/变形破坏机理/破坏模式Key words
tunnel-type anchorage/scaled model test/numerica1 simulation/deformation and failure mechanism/failure mode分类
交通工程引用本文复制引用
周火明,李维树,王帅,吴相超,王中豪..软岩隧道锚变形破坏机理缩尺模型试验研究[J].长江科学院院报,2016,33(10):67-71,5.
