【作者】 金威； 丁文其； 徐前卫； 叶亮；

【Author】 Jin Wei;Ding Wenqi;Xu Qianwei;Ye Liang;Department of Geotechnical Engineering,Tongji University;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University;School of Transportation Engineering,Tongji University;

【机构】 同济大学土木工程学院地下建筑与工程系； 同济大学岩土及地下工程教育部重点实验室； 同济大学交通运输学院；

【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。更多还原

【Abstract】 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.更多还原