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Model-Testing Technology for an Extra-Large Span Tunnel in Soft Rock
(1 Department of Geotechnical Engineering, Tongji University, Shanghai 200092;
2 Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092;
3 School of Transportation Engineering, Tongji University, Shanghai 200092)
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.
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.
JIN Wei-1,
2 ,
DING Wen-Qi-1 etc
.Model-Testing Technology for an Extra-Large Span Tunnel in Soft Rock[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(5): 99-107
2014, Vol. 51 