圭嘎拉隧道石门揭煤岩柱安全厚度及动力特性

doi:10.16265/j.cnki.issn 1003-3033.2021.07.008

中国安全科学学报 ›› 2021, Vol. 31 ›› Issue (7): 56-62.doi: 10.16265/j.cnki.issn 1003-3033.2021.07.008

圭嘎拉隧道石门揭煤岩柱安全厚度及动力特性

谢全敏教授, 晏理想, 周圣国, 王智德^** 副教授, 杨文东教授

武汉理工大学土木工程与建筑学院,湖北武汉 430070

收稿日期:2021-04-04 修回日期:2021-06-15 出版日期:2021-07-28 发布日期:2022-01-28
通讯作者: ** 王智德(1983—),男,湖南湘乡人,博士,副教授,主要从事隧道与地下工程方面的研究。E-mail:wangzhide-wuhan@whut.edu.cn。
作者简介:谢全敏 (1968—),男,四川泸州人,博士,教授,主要从事隧道与地下工程方面的研究。E-mail: xiequanmin@126.com。
基金资助:
国家自然科学基金资助(51779197);武汉市城乡建设委员会科技计划项目(201740,201941)。

Safety thickness and dynamic characteristics of rock pillar of uncovering coal at rock cross-cut in Guigala tunnel

XIE Quanmin, YAN Lixiang, ZHOU Shengguo, WANG Zhide, YANG Wendong

School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan Hubei 430070, China

Received:2021-04-04 Revised:2021-06-15 Online:2021-07-28 Published:2022-01-28

摘要/Abstract

摘要： 为解决煤系地层公路隧道施工中瓦斯气体泄漏、爆炸及煤层突出、挤出、压出等地质灾害问题,以西藏拉泽高速公路圭嘎拉隧道为研究对象,采用结构力学理论,结合岩柱爆破损伤范围大小和地应力与煤层瓦斯压力作用下岩柱安全厚度,得出不同煤层倾角隧道石门揭煤的岩柱安全厚度计算式,得到圭嘎拉隧道石门揭煤岩柱安全厚度;运用数值模拟法建立煤系地层公路隧道石门揭煤动力学模型,研究石门揭煤掏槽爆破微差间隔时间对煤层及其顶底板的动力特性,获得煤层与顶底板动力响应特征。结果表明:圭嘎啦隧道石门揭煤安全厚度2.8 m是合理的;随着微差间隔时间增加,动力响应强度降低,石门揭煤爆破最佳微差间隔时间为50 ms;随着煤层倾角增大,动力响应强度增强,应适当减小急倾斜和倾斜煤层揭煤深度,可适当增大缓倾斜煤层揭煤深度。

关键词: 石门揭煤, 岩柱安全厚度, 动力响应, 煤系地层, 公路隧道

Abstract: In order to address geological disasters such as gas leakage, explosion, coal seam outburst, extrusion and pulsion in construction of highway tunnel with coal-bearing strata, with Guigala tunnel of Laze highway as research object, theoretical analysis on structural mechanics was conducted, and blasting damage range size of rock pillar and its safety thickness under pressure of coal seam gas were considered to deduce calculation formula of safety thickness for uncovering coal at rock cross-cut in tunnels with different inclination of coal seams, by using which safety thickness in Guyala tunnel was obtained. Then, numerical simulation was applied to establish a dynamic model of uncovering coal at rock cross-cut in highway tunnels with coal-bearing strata, dynamic characteristics of coal seam and its roof and floor, which was under millisecond time of cutting blasting of the uncovering coal, were studied, and dynamic response characteristic of coal seam contacting roof and floor were acquired. The results show that safety thickness of rock pillar at 8m in Guyala tunnel is reasonable. Dynamic response strength decreases as millisecond interval time increases, and the best interval for uncovering coal at rock cross-cut is 50ms. However, the strength increases along with increase of coal seam dip angle, so it is necessary to properly reduce coal uncovering depth in steeply inclined and inclined coal seams and increase that of gently inclined coal seams.

Key words: uncovering coal at rock cross-cut, safety thickness of rock pillar, dynamic response, coal-bearing strata, highway tunnel

中图分类号:

X915.5

谢全敏, 晏理想, 周圣国, 王智德, 杨文东. 圭嘎拉隧道石门揭煤岩柱安全厚度及动力特性[J]. 中国安全科学学报, 2021, 31(7): 56-62.

XIE Quanmin, YAN Lixiang, ZHOU Shengguo, WANG Zhide, YANG Wendong. Safety thickness and dynamic characteristics of rock pillar of uncovering coal at rock cross-cut in Guigala tunnel[J]. China Safety Science Journal, 2021, 31(7): 56-62.

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圭嘎拉隧道石门揭煤岩柱安全厚度及动力特性

Safety thickness and dynamic characteristics of rock pillar of uncovering coal at rock cross-cut in Guigala tunnel

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