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to the loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader030vdocumentsnetreader030viewer20220220185b876e867f8b9a2d238ca17bhtml5thumbnails9jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=10Page 10button div class=ts-imagea href=https:reader030vdocumentsnetreader030viewer20220220185b876e867f8b9a2d238ca17bhtml5page10jpg target=_blank img data-url=-december-94-introduction-page-2-tunnel-excavation-by-a-tunnel-boring-machinehtmlpage=10 data-page=10 class=ts-thumb lazyload alt=Page 10: scda9b588dd0ee343jimcontentcom · December 94 Introduction page 2 Tunnel excavation by a tunnel boring machine TBM is a common method becoming more and more competitive to the loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC 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