为掌握含气地层中盾构隧道渗漏气引起的地层变形对隧道结构的影响,以苏通气体绝缘金属封闭输电线路(gas-insulated metal enclosed transmission line,GIL)项目中江底富含高压浅层气地层为研究对象,利用自主开发的有限元程序,并采用非...为掌握含气地层中盾构隧道渗漏气引起的地层变形对隧道结构的影响,以苏通气体绝缘金属封闭输电线路(gas-insulated metal enclosed transmission line,GIL)项目中江底富含高压浅层气地层为研究对象,利用自主开发的有限元程序,并采用非饱和弹塑性本构模型,对含气地层不均匀沉降对盾构隧道结构的影响进行了三维固-液-气耦合数值模拟分析。结果表明:排气引起的地层不均匀沉降会导致隧道沉降,产生附加内力。其中,渗气口附近沉降位移最大,含气地层下部由于卸荷效应会有少许回弹;同时,沉降位移最大处所在截面的附加弯矩也最大;越远离含气层的位置,截面附加弯矩越小。展开更多
D-S evidence theory provides a good approach to fuse uncertain inlbrmation. In this article, we introduce seismic multi-attribute fusion based on D-S evidence theory to predict the coalbed methane （CBM） concentrated...D-S evidence theory provides a good approach to fuse uncertain inlbrmation. In this article, we introduce seismic multi-attribute fusion based on D-S evidence theory to predict the coalbed methane （CBM） concentrated areas. First, we choose seismic attributes that are most sensitive to CBM content changes with the guidance of CBM content measured at well sites. Then the selected seismic attributes are fused using D-S evidence theory and the fusion results are used to predict CBM-enriched area. The application shows that the predicted CBM content and the measured values are basically consistent. The results indicate that using D-S evidence theory in seismic multi-attribute fusion to predict CBM-enriched areas is feasible.展开更多
文摘为掌握含气地层中盾构隧道渗漏气引起的地层变形对隧道结构的影响,以苏通气体绝缘金属封闭输电线路(gas-insulated metal enclosed transmission line,GIL)项目中江底富含高压浅层气地层为研究对象,利用自主开发的有限元程序,并采用非饱和弹塑性本构模型,对含气地层不均匀沉降对盾构隧道结构的影响进行了三维固-液-气耦合数值模拟分析。结果表明:排气引起的地层不均匀沉降会导致隧道沉降,产生附加内力。其中,渗气口附近沉降位移最大,含气地层下部由于卸荷效应会有少许回弹;同时,沉降位移最大处所在截面的附加弯矩也最大;越远离含气层的位置,截面附加弯矩越小。
基金supported by the National Basic Research Program of China (973 Program) (No. 2009CB219603)Key Special National Project (No. 2008ZX05035)Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘D-S evidence theory provides a good approach to fuse uncertain inlbrmation. In this article, we introduce seismic multi-attribute fusion based on D-S evidence theory to predict the coalbed methane （CBM） concentrated areas. First, we choose seismic attributes that are most sensitive to CBM content changes with the guidance of CBM content measured at well sites. Then the selected seismic attributes are fused using D-S evidence theory and the fusion results are used to predict CBM-enriched area. The application shows that the predicted CBM content and the measured values are basically consistent. The results indicate that using D-S evidence theory in seismic multi-attribute fusion to predict CBM-enriched areas is feasible.
