南水北调中线一期工程穿黄隧洞纵向变形研究
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摘要
南水北调工程穿黄隧洞纵向变形主要受施工扰动、下卧土层沉降变化以及河床冲淤等因素的影响。为此,通过河工模型试验,揭示了冲淤荷载的变化情况,分析了其在地震荷载作用下的分布及影响,着重对在内水压载和冲淤作用下的不同工况进行了计算分析。提出了针对上述3种荷载组合情况下的隧洞管段的布置方案,论证了该方案可适应纵向变形,且具有一定的安全裕度。
The longitudinal deformation of Yellow River Crossing Tunnel of Middle Route Project of S-N Water Diversion is mainly affected by construction disturbance,settlement variation of underlying soil layer,souring and silting of river channel.Therefore,through hydraulic model test,we demonstrated variation of scouring and silting load,analyzed the deformation distribution and influence under seismic load,and mainly calculated deformation under the conditions of different internal water pressures and souring and silting.The arrangement scheme of the tunnel aiming at the 3 load combination conditions is proposed.It is verified that the proposed scheme can adapt to longitudinal deformation and has safety margin.
The longitudinal deformation of Yellow River Crossing Tunnel of Middle Route Project of S-N Water Diversion is mainly affected by construction disturbance,settlement variation of underlying soil layer,souring and silting of river channel.Therefore,through hydraulic model test,we demonstrated variation of scouring and silting load,analyzed the deformation distribution and influence under seismic load,and mainly calculated deformation under the conditions of different internal water pressures and souring and silting.The arrangement scheme of the tunnel aiming at the 3 load combination conditions is proposed.It is verified that the proposed scheme can adapt to longitudinal deformation and has safety margin.
引文
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