爆破作用下层状围岩隧道突变失稳判据研究

doi:10.16265/j.cnki.issn1003-3033.2024.01.2440

中国安全科学学报 ›› 2024, Vol. 34 ›› Issue (1): 171-178.doi: 10.16265/j.cnki.issn1003-3033.2024.01.2440

爆破作用下层状围岩隧道突变失稳判据研究

彭亚雄¹^,²(), 周子霈¹, 姚颖康², 刘运思¹, 左清军³

¹ 湖南科技大学岩土工程稳定控制与健康监测湖南省重点实验室,湖南湘潭 411201
² 江汉大学省部共建精细爆破国家重点实验室,湖北武汉 430056
³ 三峡大学防灾减灾湖北省重点实验室,湖北宜昌 443002

收稿日期:2023-08-10 修回日期:2023-11-13 出版日期:2024-01-28
作者简介:
彭亚雄 (1990—),男,湖南宁乡人,博士,副教授,主要从事隧道与爆破工程等方面的研究。E-mail:1020172@hnust.edu.cn。
姚颖康,高级工程师
刘运思,副教授
左清军,副教授
基金资助:
湖南省教育厅科学研究项目(22B0486); 江汉大学省部共建精细爆破国家重点实验室; 江汉大学爆破工程湖北省重点实验室联合开放基金资助(PBSKL-2022-D-08)

Study on catastrophe instability criterion of layered surrounding rock in tunnel under blasting

PENG Yaxiong¹^,²(), ZHOU Zipei¹, YAO Yingkang², LIU Yunsi¹, ZUO Qingjun³

¹ Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring, Hunan University of Science and Technology, Xiangtan Hunan 411201, China
² State Key Laboratory of Precision Blasting, Jianghan University, Wuhan Hubei 4300561, China
³ Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang Hubei 443002, China

Received:2023-08-10 Revised:2023-11-13 Published:2024-01-28

摘要/Abstract

摘要：

为判断爆破振动与损伤作用下层状岩体隧道的围岩稳定性,根据层状围岩失稳特征建立隧道力学模型,考虑爆破损伤和振动效应,构建层状围岩隧道系统总势能方程和突变失稳判据,分析爆破作用下层状围岩稳定性演化规律;并以沪昆高铁湖南段姚家隧道为工程背景,分析层状围岩隧道稳定性。结果表明:层状围岩隧道发生突变失稳的充要条件是满足分岔集方程,即当突变特征值Δ≤0时系统可能发生突变失稳;爆破累积效应造成围岩刚度不断降低,爆破药量增加提高爆破振动效应,这些均导致层状围岩失稳概率增加;实际隧道失稳评价结果与施工现场情况、监测结果一致,验证了失稳判据的有效性。

关键词: 爆破作用, 层状围岩隧道, 失稳判据, 突变理论, 稳定性

Abstract:

In order to judge the stability of the surrounding rock in a tunnel under the blasting vibration and damage, the mechanics model was established according to the instability characteristics of the layered surrounding rock. Considering the blasting damage and vibration effect, the total potential energy equation and catastrophe instability criterion were established, and the stability evolution law of tunnel under blasting was analyzed. Taking Yaojia tunnel in Hunan of Shanghai-Kunming high-speed railway as an engineering background, the stability of the layered surrounding rock in the tunnel was analyzed. The results show that the necessary and sufficient condition for the catastrophe instability of layered surrounding rock in the tunnel satisfies the bifurcation equation, that is, when the mutation eigenvalue Δ≤0, the system may suffer catastrophe instability. The cumulative effect of blasting results in the continuous reduction of surrounding rock stiffness, and the increase of blasting charge aggravates the blasting vibration effect, both of which increase instability probability for stratified surrounding rock. The actual instability evaluation results are consistent with the construction site situation and monitoring results, which verifies the effectiveness of the instability criterion.

Key words: blasting effect, layered surrounding rock tunnel, instability criterion, catastrophe theory, stability

中图分类号:

彭亚雄, 周子霈, 姚颖康, 刘运思, 左清军. 爆破作用下层状围岩隧道突变失稳判据研究[J]. 中国安全科学学报, 2024, 34(1): 171-178.

PENG Yaxiong, ZHOU Zipei, YAO Yingkang, LIU Yunsi, ZUO Qingjun. Study on catastrophe instability criterion of layered surrounding rock in tunnel under blasting[J]. China Safety Science Journal, 2024, 34(1): 171-178.

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断面里程	计算参数	累积爆破次数
断面里程	计算参数	0	5	10	15
DK380+837	v_i/(m·s^-1)	3 786	3 619	3 428	3 185
DK380+837	D	0	0.086	0.180	0.292
DK381+263	v_i/(m·s^-1)	3 931	3 770	3 584	3 347
DK381+263	D	0	0.080	0.169	0.275
DK384+029	v_i/(m·s^-1)	4 047	3 885	3 700	3 478
DK384+029	D	0	0.078	0.164	0.261

断面里程	围岩物理力学参数									爆破与振动参数
断面里程	γ_c/(kN·m^-3)	E₀/GPa	I	l/m	h/cm	α/(°)	τ/kPa	c/MPa	φ/(°)	K	ζ	f/Hz	Q/kg
DK380+837	26.4	35.58	0.01	5.2	5.0	32	60	0.20	26	179	1.42	25.5	22.6
DK381+263	25.3	32.52	0.01	5.1	5.0	41	50	0.22	26	256	1.80	21.3	23.8
DK384+029	26.8	34.87	0.01	4.9	5.0	62	55	0.21	26	209	1.54	26.4	24.2

爆破作用下层状围岩隧道突变失稳判据研究

Study on catastrophe instability criterion of layered surrounding rock in tunnel under blasting

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