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Measurement Technology for Strata Displacement at Different Depths Induced by Shield-Driven Tunnelling
(1Beijing Urban Construction Group Co. Ltd., Beijing 100088; 2 China University of Mining and Technology, School of Mechanics and Civil Engineering, Beijing 100083)
Abstract Based on a study of the measurement technology for strata displacement at different depths induced by shield tunnel excavation, a kind of high-precision displacement measurement technology was put forward and successfully used and validated in Beijing metro line 14. First, the technology integrates the static level system with a single-point displacement meter by platform anchorage, calculating the displacement measurement with high precision, high frequency and low disturbance. Secondly, using the cutterhead center as a zero point, a dynamic coordinate system was established under the assumption of stable tunnel excavation in homogeneous strata, and the coordi? nate transformation of displacements in different depths was proved to be feasible. Finally, the multiple regression analysis method was used to eliminate the influence of actual unstable construction parameters on the measurement results, guaranteeing the accuracy of the measurement data, guiding the control of settlement induced by shield tunnelling and design, and supporting construction and risk management of shield tunnels in complex conditions.
Abstract：
Based on a study of the measurement technology for strata displacement at different depths induced by shield tunnel excavation, a kind of high-precision displacement measurement technology was put forward and successfully used and validated in Beijing metro line 14. First, the technology integrates the static level system with a single-point displacement meter by platform anchorage, calculating the displacement measurement with high precision, high frequency and low disturbance. Secondly, using the cutterhead center as a zero point, a dynamic coordinate system was established under the assumption of stable tunnel excavation in homogeneous strata, and the coordi? nate transformation of displacements in different depths was proved to be feasible. Finally, the multiple regression analysis method was used to eliminate the influence of actual unstable construction parameters on the measurement results, guaranteeing the accuracy of the measurement data, guiding the control of settlement induced by shield tunnelling and design, and supporting construction and risk management of shield tunnels in complex conditions.
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Cite this article:
.Measurement Technology for Strata Displacement at Different Depths Induced by Shield-Driven Tunnelling[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(4): 123-130
2017, Vol. 54 