Table 2 Surrounding rock classification...

Table 2

Surrounding rock classification sample database for large-section rock tunnel faces

Surrounding rock class	Tunnel name	Main lithology	Sample size
Surrounding rock class	Tunnel name	Main lithology	Geological sketch	Drilling parameter
III	Xinhua	Dolomite, slate, shale	24	24
III	Xiangjiawan	Shale, limestone	97	97
IV	Gaojiaping	Shale, limestone	21	21
	Chufeng	Dolomite, etc.	18	18
	Xinhua	Dolomite, slate, shale	44	44
	Xiangjiawan	Shale, limestone	6	6
	Xiangluping	Mudstone	35	35
V	Gaojiaping	Shale, limestone	46	46
V	Xinhua	Dolomite, slate, shale	8	8
Total			299	299

Surrounding rock class	Tunnel name	Main lithology	Sample size
Surrounding rock class	Tunnel name	Main lithology	Geological sketch	Drilling parameter
III	Xinhua	Dolomite, slate, shale	24	24
III	Xiangjiawan	Shale, limestone	97	97
IV	Gaojiaping	Shale, limestone	21	21
	Chufeng	Dolomite, etc.	18	18
	Xinhua	Dolomite, slate, shale	44	44
	Xiangjiawan	Shale, limestone	6	6
	Xiangluping	Mudstone	35	35
V	Gaojiaping	Shale, limestone	46	46
V	Xinhua	Dolomite, slate, shale	8	8
Total			299	299