The Influence Mechanism of In Situ Stress State on the Stability of Deep-Buried-Curved Tunnel in Qinghai-Tibet Plateau and Its Adjacent Region

Table 6

Comparison of rockburst intensity between predictive equations and actual construction at typical deep-buried tunnels.

	Deep-buried tunnel	The maximum depth (m)	In situ stress measurement					(MPa)	φ (°)	(position)		Rockburst intensity
			Lithology	Text depth (m)	(MPa)	(MPa)	KH					Predictive equations	Other assess methods	Actual construction
1	Chainage 09+706 in the Neelum-Jhelum Hydroelectric Project, Pakistan [18]	1860	Sandstone	1550	Unclear	Unclear	1.25	86	90	41.19 (roof)	0.77	Severe	Severe	Severe
2	Guigala Expressway tunnel, China [75]	1200	Granite	560	21.78	14.84	1.47	75.4	89	45.64 (roof)	0.6	Severe	Severe	Unclear
3	Dangjinshan railway tunnel, China [76]	764	Mica, quartz, schist	551	28.56	14.64	1.95	87	21	38.61 (corner)	0.50	Moderate	Moderate	Unclear
4	Bayu railway tunnel, China [44]	2073	Granite	583	17.72	15.13	1.17	151.9	87	39.85 (corner)	0.42	Moderate	Moderate	Yes
5	Gaoligong mountain railway tunnel, China [77, 78]	1600	Granite	699	28.68	18.87	1.52	70.7–125.4	15	34.07 (corner)	0.28–0.48	Weak-moderate	Yes	Weak-moderate
6	7# laboratory of Jinping II Hydropower Station, China [79, 60]	2525	Marble	2400	67.32	69.2	0.97	99–114	45	51.67 (corner and sidewall)	0.23–0.33	Weak-moderate	Unclear	Weak-moderate, spalling
7	Zheduoshan railway tunnel, China [15]	1124	Quartz and siltstone	248	17.44	6.55	2.66	62.2–140.6	30	53.12 (roof)	0.37–0.85	Moderate-severe	Moderate-severe	Unclear
8	Erlang Mountain highway tunnel, China [16, 61]	760	Siltstone	750	35.3	8.1	4.36	139.9	20	82.48 (roof)	0.59	Severe	Unclear	Severe
9	Muzhailing railway tunnel, China [62]	600	Sandstone	330	26.22	8.95	2.93	94.5–98.5	3.5	45.64 (roof)	0.46–0.48	Moderate	Moderate	Yes
10	Micang Mountain highway tunnel, China [45]	>1000	Granite	600	28.43	11.94	1.18	102.7	86	81.52 (roof)	0.78	Severe	Severe	Yes
11	Ping’an tunnel, China [83]	Unclear	Limestone	1350–1430	31.52	15.17	2.08	28.7–76.6	6	37.79 (corner)	0.49–1.31	Moderate-severe	Moderate-severe	Moderate-severe
12	Qinling railway tunnel, China [84, 85]	1600	Granite	560	19.7	14.5	1.35	95–130	31	34.88 (corner)	0.27–0.37	Weak-moderate	Yes	Weak-moderate
13	Xinbaiyanzhai railway tunnel, China [86]	Unclear	Syenite	444	23.44	13.45	1.74	105.9–169.7	15	35.95 (corner)	0.21–0.33	Weak-moderate	Yes	Spalling
14	Baziling railway tunnel, China [87]	695	Limestone	546	14.95	14.46	1.02	64.6	51	57.04 (corner)	0.53	Moderate	Moderate	Unclear
15	−205 m level of Zhazixi Antimony Mine, China [88]	605	Quartz and sandstone	605	19.61	8	2.05	65.2	22	39.20 (corner)	0.60	Severe	Unclear	Severe

Note: “yes” means rockburst occured but intensity unknown.