晚石炭纪，沉积岩（整块岩石经风、水的外力侵蚀，然后均匀沉淀而形成）广泛分布于那些有可能反复被洪水侵袭的地区；
During the Late Carboniferous, sedimentary rocks—rocks eroded by wind and water and deposited as fine sediments—carpeted much of the region, which might have been partially flooded from time to time.
低围压时，岩石试件内材料并未趋于均匀化，非均质性显著，强度尺寸效应明显；
At low confining pressures, the inhomogeneity of rock materials results in obvious strength-size effect.
根据全断面岩石掘进机盘形滚刀工作时的受力，建立了刀盘受力均匀且横向载荷为零的盘刀布置规律。
According to forces applying on the disk-shaped cutters of whole-section tunneler, cutter arrangement rules are established with even loading on the disk and null traverse load.
应用推荐