These findings, backed up by other data collected from conventional inspections, led London Underground to investigate the replacement of the tunnel lining.
这些发现，是从常规检查而收集出来的其它数据中被证实，引致伦敦地下铁要调查研究隧洞衬砌的替代物。
2
Many site tests have also proved that the strength of anchor and shotcrete support is much greater than that of conventional in situ concrete lining.