【作者】 张宇；

【导师】 张向东； 张淑坤；

【作者基本信息】 辽宁工程技术大学 ， 岩土工程， 2023， 硕士

【摘要】 随着我国隧道建设进入飞速发展阶段,安全问题也逐渐引起我们的重视,由瓦斯而引发的施工安全事故屡见不鲜,因此国内外大批学者相继对隧道中瓦斯安全问题进行深入的研究,并取得很多有用的成果。然而通过我们查阅可以看出,这些研究大部分针对于煤系地层,而对于非煤系地层的研究成果较少,尤其关于水利方面更为稀少。非煤系地层与煤系地层相比更需引起重视,因其具有随机性,突发性的特点,大大增加了施工危险性。因此本文以朝阳一标引水隧洞C1#工作面瓦斯逸出情况为工程背景,开展现场调研、岩石物理力学试验、理论分析、仿真模拟及现场工业试验等手段,对施工作用下隧洞内部围岩应力场变化、瓦斯压力渗透性变化情况进行探究,主要研究成果如下:(1)通过现场调研结果,结合室内物理力学实验,确定稳态与非稳态条件下瓦斯渗透性影响因素,建立围岩变形渗透率模型,确定渗透率变化存在“V”型折点,并确定极值点条件。(2)通过仿真模拟手段,对隧洞给施工进行模拟,确定在施工作用下,围岩内部应力变化、塑性区变化及瓦斯压力变化对围岩渗透性影响规律。(3)基于围岩变形及围岩渗透性影响因素提出注浆、抽排方案,采用COMSOL和Midas对多种方案进行模拟,并根据实用性、价值性的要求对方案进行选择;并通过现场工业性试验对选择方案进行效果检测,根据现场效果分析表明,该注浆—抽排方案对隧洞内瓦斯治理效果很好,可为类似地质条件下的瓦斯控制工程提供参考。该论文有图161幅、表17个、参考文献72篇。更多还原

【Abstract】 With the rapid development of tunnel construction in China,safety issues have gradually attracted our attention,and construction safety accidents caused by gas are not uncommon.Therefore,a large number of scholars at home and abroad have conducted in-depth research on the problem of gas in tunnels,and achieved many useful results.However,we can see from our review that most of these studies focus on coal measures strata,while for non coal measures strata,research results are limited,Especially for water conservancy,it is rare.Compared with coal measure strata,non coal measure strata need more attention.Because of its randomness and abruptness,it greatly increases the risk of construction.Therefore,based on the gas escape situation of the C1 # working face of the headrace tunnel of Chaoyang Lot I,this paper carries out field research,rock physical and mechanical tests,theoretical analysis,simulation and field industrial tests,and explores the changes in the stress field of the surrounding rock inside the tunnel and the changes in gas pressure permeability under construction.The main research results are as follows:(1)Based on the field investigation results,combined with the indoor physical and mechanical experiments,the influencing factors of gas permeability under steady and unsteady conditions are determined,the surrounding rock deformation permeability model is established,the "V" type break point of permeability change is determined,and the extreme point conditions are determined.(2)By means of simulation,the tunnel construction is simulated to determine the law of the influence of the change of internal stress,plastic zone and gas pressure on the permeability of surrounding rock under the construction.(3)Based on the factors affecting the deformation and permeability of surrounding rock,the grouting and drainage scheme is proposed,and multiple schemes are simulated through COMSOL and Midas.The scheme is selected according to its practicality and value,and the effect of the selected scheme is tested through on-site industrial tests.According to the on-site effect analysis,the grouting and drainage scheme is more appropriate for gas control in the tunnel,It can provide reference for gas control under similar geological conditions.This paper has 161 figures,17 tables and 72 references.更多还原