摘要
利用大型地质力学模型试验台架开展软弱围岩特大跨度隧道开挖模型试验的技术研究,主要包括软弱围岩相似材料的配制方法、模型试验台架及加载系统、围岩应力量测系统及围岩位移量测系统。采用单点薄膜压力传感器进行围岩应力量测,具有准确、灵敏和扰动小等特点。文章基于光栅尺与PIV的围岩位移量测技术,开展了一组软弱围岩特大跨度隧道毛洞开挖模型试验,研究隧道开挖对围岩应力场和位移场的影响规律。结果表明,模型试验系统具备优良的操作性能及先进的测试水平,可满足大型岩土模型试验研究需要,对实际工程有一定的指导意义。
Based on a geo-mechanical model test stand,the model-testing technology for an extra-large span tunnel within soft rock is studied.Included in this study are the preparation of similar materials,model test stands,loading systems,and stress and displacement measurement systems.Regarding stress measurement,the single-point thin film pressure sensor is used because of its characteristics of high precision,sound sensitivity,and little disturbance.For the rock displacement distribution,the grating scale and PIV-based displacement measurement technique is used.The model test results verify the excellent operating performance and advanced measuring level of the model test system,which satisfy the requirements of a large-scale geo-mechanical model test.
出处
《现代隧道技术》
EI
北大核心
2014年第5期99-107,共9页
Modern Tunnelling Technology
基金
国家高技术研究发展计划(863计划)(No.2012AA112502)
国家重点基础研究发展计划(973计划)(No.2014CB046905)
复杂环境下浅埋大断面互通隧道结构关键技术研究
关键词
软弱围岩
模型试验
相似材料
应力量测
位移量测
Soft rock
Model test
Similar material
Stress measurement
Displacement measurement
