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含有燧石的白垩已成功地被局部断面钻臂式切割机掘进。这种切割机,或者用掏槽方法剥落燧石岩球和夹层,或者用为此目的而设计的切割工具的锋利刃口,对准目标冲击破碎燧石。现今的研究对象是:测定安装在全断面隧道掘进机刀盘上的刮刀和盘刀,在掘进含有燧石的白垩时的能力。
The chalked chalk has been successfully driven by a partial cross-section arm-cutting machine. This type of cutting machine either peels off flint balls and interbed by undercutting or a sharp edge of a cutting tool designed for this purpose, aimed at the target impact crushing flint. Today’s research object is to determine the ability of a scraper and a disk cutter mounted on a cutter head of a full face tunnel boring machine to drill chalked chalks.