Study on catastrophe instability criterion of surrounding rock in tunnels blasting crossing water-rich fault zones

doi:10.16265/j.cnki.issn1003-3033.2022.05.0887

Abstract

Abstract:

In order to solve instability problems of tunnels blasting through rich water fault zones, based on instability mechanical model of tunnel-fault system under blasting, a cusp catastrophic model was established considering the combined effects of blasting and groundwater. Instability mechanism of surrounding rock under tunnel-fault system was revealed, and its instability criterion was developed. Then, with resource allocation project of Pingtan and Minjiangkou in Fujian as an example, rock stability of tunnels crossing water-rich fault zones was evaluated. The results show that the instability of surrounding rock is a result of internal and external factors. Due to long-term water-rock interaction and cumulative blasting, mechanical properties of surrounding rock in water-rich fault zones are constantly weakened, and catastrophe criterion, k value, is constantly reduced, which probably leads to instability and failure of the rock. The results of instability risk evaluation based on the criterion are consistent with field conditions.

Key words: water-rich fault zone, tunnel blasting, instability criterion, underground water, cusp catastrophe model

PENG Yaxiong, LIU Guangjin, HUANG Zhigang, LYU Hubo, WU Li. Study on catastrophe instability criterion of surrounding rock in tunnels blasting crossing water-rich fault zones[J]. China Safety Science Journal, 2022, 32(5): 104-111.

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References 16

[1]	陈明, 卢文波, 严鹏, 等. 爆破开挖对岩体含水裂纹扩展的扰动机制[J]. 岩土力学, 2014, 35(6): 1555-1560.
	CHEN Ming, LU Wenbo, YAN Peng, et al. Disturbance mechanism of blasting excavation to aquiferous rock crack propagation[J]. Rock and Soil Mechanics, 2014, 35(6): 1555-1560.
[2]	左清军, 吴立, 林存友, 等. 富水软岩隧道跨越断层段塌方机制分析及处治措施[J]. 岩石力学与工程学报, 2016, 35(2): 369-377.
	ZUO Qingjun, WU Li, LIN Cunyou, et al. Collapse mechanism and treatment measures for tunnel in water-rich soft rock crossing fault[J]. Chinese Journal of Rock Mechanics and Engineering, 2016, 35(2): 369-377.
[3]	KIANI M, AKHLAGHI T, GHALANDARZADEH A. Experimental modeling of segmental shallow tunnels in alluvial affected by normal faults[J]. Tunnelling and Underground Space Technology, 2016, 51: 108-119. doi: 10.1016/j.tust.2015.10.005
[4]	吕国鹏, 周传波. 隧道断层带注浆加固围岩体爆破动力损伤特征[J]. 岩石力学与工程学报, 2021, 40(10): 2038-2047.
	LYU Guopeng, ZHOU Chuanbo. Damage characteristics of tunnel grouting rock mass induced to blasting in fault zones[J]. Chinese Journal of Rock Mechanics and Engineering, 2021, 40(10): 2038-2047.
[5]	祁彬溪, 王凡, 陈捷翎. 粘滑断层错动作用下穿越断层隧道结构响应数值模拟[J]. 建筑结构, 2020, 50(增2): 753-758.
	QI Binxi, WANG Fan, CHEN Jieling. Numerical simulation on structural response of tunnel passing through fault under the action of stick slip fault dislocation[J]. Building Structure, 2020, 50(S2): 753-758.
[6]	张向阳, 任尚磊, 许林峰. 断层错动作用下隧道衬砌围岩破坏机理研究[J]. 地下空间与工程学报, 2021, 17(1): 290-299.
	ZHANG Xiangyang, REN Shanglei, XU Linfeng. Study on coupled failure mechanism of tunnel structural surrounding rock under fault motion[J]. Chinese Journal of Underground Space and Engineering, 2021, 17(1): 290-299.
[7]	宋瑞刚, 张顶立, 文明. 穿越断层破碎带深埋隧道围岩失稳的突变理论分析[J]. 土木工程学报, 2015, 48(增1): 289-292.
	SONG Ruigang, ZHANG Dingli, WEN Ming. The cusp catastrophe theory analysis for instability of deep-buried tunnels surrounding rock through fault fracture zone[J]. China Civil Engineering Journal, 2015, 48(S1): 289-292.
[8]	PENG Yaxiong, WU Li, CHEN Chunhui, et al. Stability analysis of surrounding rock in tunnel crossing water-rich fault based on catastrophe theory[J]. Geotechnical and Geology Engineering, 2020, 38(1):415-423.
[9]	王家臣, 孙书伟. 露天矿边坡工程[M]. 北京: 科学出版社, 2016: 26-29.
[10]	殷有泉, 杜静. 地震过程的燕尾型突变模型[J]. 地震学报, 1994, 16(4): 416-422.
	YIN Youquan, DU Jing. A swallowtail catastrophe model of seismic process[J]. Acta Seismologica Sinica, 1994, 16(4): 416-422.
[11]	朱传云, 喻胜春. 爆破引起岩体损伤的判别方法研究[J]. 工程爆破, 2001, 4(1): 12-16.
	ZHU Chuanyun, YU Shengchun. Research on the discrimination method of rock mass damage caused by blasting[J]. Engineering Blasting, 2001, 4(1): 12-16.
[12]	王智德, 马祖遥. 爆破荷载作用下顺层岩质边坡的损伤特性研究[J]. 中国安全科学学报, 2018, 28(11): 72-79. doi: 10.16265/j.cnki.issn1003-3033.2018.11.012
	WANG Zhide, MA Zuyao. Damage characteristics of bedding rock slope under blasting load[J]. China Safety Science Journal, 2018, 28(11): 72-79. doi: 10.16265/j.cnki.issn1003-3033.2018.11.012
[13]	周子涵, 陈忠辉, 包敏, 等. 顺倾断续节理岩质边坡的稳定性突变[J]. 煤炭学报, 2020, 45(增1): 161-172.
	ZHOU Zihan, CHEN Zhonghui, BAO Min, et al. Stability of rock slope with bedding intermittent joints based on catastrophe theory[J]. Journal of China Coal Society, 2020, 45(S1): 161-172.
[14]	夏开宗, 刘秀敏, 陈从新, 等. 考虑突变理论的顺层岩质边坡失稳研究[J]. 岩土力学, 2015, 36(2): 477-486.
	XIA Kaizong, LIU Xiumin, CHEN Congxin, et al. Analysis of mechanism of bedding rock slope instability with catastrophe theory[J]. Rock and Soil Mechanics, 2015, 36(2): 477-486.
[15]	刘波, 肖红飞. 隧道下伏溶洞顶板安全厚度确定方法[J]. 中国安全科学学报, 2019, 29(4): 104-111. doi: 10.16265/j.cnki.issn1003-3033.2019.04.017
	LIU Bo, XIAO Hongfei. Method for determining safe thickness of cave roofs under a tunnel[J]. China Safety Science Journal, 2019, 29(4): 104-111. doi: 10.16265/j.cnki.issn1003-3033.2019.04.017
[16]	秦四清, 王思敬, 孙强, 等. 非线性岩土力学基础[M]. 北京: 地质出版社, 2008: 37-38.

断层带编号	里程	围岩容重γ/ (kN·m^-3)	G_e/GPa	G_s/GPa	m	l_e/l_s	ω_e/%	ω_s/%	d/m	θ/(°)
F32	D12+199~D12+211	19.4	2.14	2.01	1.2	0.3	22.8	23.8	12	65
F55	D3+845~D3+863	19.8	2.25	1.98	1.2	0.2	24.4	26.9	18	76

炮孔类型	孔数	孔深/m	药量/kg	起爆段别
掏槽孔	4	2.3	7.2	1
辅助孔	54	2.1	75.6	3、5、7、9
底孔	9	2.1	10.8	13
光爆孔	19	2.1	11.4	11

断层带编号	孔深/m	累积爆破次数
断层带编号	孔深/m	0	5	10	15
F32	3.0	3 380	3 231	3 061	2 844
	4.0	3 510	3 366	3 200	2 988
	5.0	3 613	3 469	3 304	3 105
D	—	0	0.082	0.171	0.276
断层带编号	孔深/m	累积爆破次数
断层带编号	孔深/m	F55	3.0	3 588	3 407	3 204	2 947
4.0	3 660		3 486	3 291	3 045
5.0	3 801		3 627	3 434	3 202
D	—	0	0.094	0.193	0.308