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APPLICATION OF THE ROOF DISTURBANCE TO MONITORING AND PREDICTING THE GROUND PRESSURE
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作者 付国彬 钱鸣高 《Journal of China University of Mining and Technology》 1992年第1期74-82,共9页
Based on study of the influence of main roof fracture on ground pressure, this paper considered the immediate roof as a semi-infinite long beam on a Winkler elastic foundation. In the model the coal seam is the founda... Based on study of the influence of main roof fracture on ground pressure, this paper considered the immediate roof as a semi-infinite long beam on a Winkler elastic foundation. In the model the coal seam is the foundation and the pressure caused by mian roof deflection is the load. Having solved the model and analyzed relevant factors,the authors indicate that the disturbance caused by the breakage of the mian roof can be observed in both gates of longwall face and explain why it can be. The paper points out that the applicability of the method to obtain the disturbance information by measuring the loads on supports is wider than that by measuring the roof convergence rate. The results are useful for monitoring and predicting ground pressure. 展开更多
关键词 underground pressure roof disturbance beam on elastic foundation
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Enhanced elastic beam model with BADS integrated for settlement assessment of immersed tunnels
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作者 Cong Tang Shu-Yu He +2 位作者 Zheng Guan Wan-Huan Zhou Zhen-Yu Yin 《Underground Space》 SCIE EI CSCD 2023年第5期79-88,共10页
Excessive settlement may induce structural damage and water leakage in immersed tunnels,seriously threatening the tunnels’safety.However,making accurate assessment of the settlement in immersed tunnels is difficult d... Excessive settlement may induce structural damage and water leakage in immersed tunnels,seriously threatening the tunnels’safety.However,making accurate assessment of the settlement in immersed tunnels is difficult due to the incomplete knowledge of the geotechnical parameters and the inadequacy of the model itself.This paper proposes an effective method to accurately assess the settlement in immersed tunnels.An enhanced beam on elastic foundation model(E-BEFM)is developed for the settlement assessment,with the Bayesian adaptive direct search algorithm adopted to estimate unknown model parameters based on previous observations.The proposed method is applied to a field case of the Hong Kong–Zhuhai–Macao immersed tunnel.The original BEFM is used for comparison to highlight the better assessment performance of E-BEFM,particularly for joints’differential settlement.Results show that the proposed method can provide accurate predictions of the total settlement,angular distortion(a representation of tubes’relatively differential settlement),and joints’differential settlement,which consequently supports the associated maintenance decision-making and potential risk prevention for immersed tunnels in service. 展开更多
关键词 Immersed tunnel SETTLEMENT Beam on elastic foundation model Bayesian adaptive direct search Hong Kong-Zhuhai-Macao tunnel
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