隧道顶板 meaning in Chinese

tunnel roof

Research on choosing minimal rock cover and analysing stability of xiamen subsea tunnel
厦门海底隧道顶板厚度选择及其开挖稳定性分析
With an analysis of soil liquefaction potential for free field of nanjing metro line 1 under 7 degree earthquake , as well as for excavated field , in line with railway engineering anti - earthquake design specification , dynamic triaxial tests and theoretical analysis using efficient stress method , the author comes to the conclusion that , when metro plate is located at layer s and the layer is thick , liquefied area is at metro bottom plate ; in some local section liquefied area is at metro top plate , or arch sides at the top of metro in most places
摘要采用铁路工程抗震设计规范、动三轴试验及有效应力的理论分析相结合的方法，对南京地铁南北线（ 1号线）区间隧道开挖后其地基土在7度地震情况下的土层液化情况进行分析得出：当隧道底板坐落在5层且5层较厚时的液化区出现在隧道衬砌底板处；局部地段液化区出现在隧道顶部及拱腰；大部分地段的液化区出现在隧道顶板上方。