带有支洞的水工隧洞施工通风数值模拟研究
发布时间：2018-10-05 11:54
【摘要】：隧洞建设广泛的应用于工程实践中,其爆破产生的一氧化碳和粉尘等有害物质严重危害施工人员的健康和施工设备的正常运行。为了使隧洞内的有害物质浓度控制在安全标准值之内,需要对隧洞进行通风处理。因此通风问题成为制约施工进度的瓶颈。研究炮烟在通风条件下的时间与空间分布规律,为通风设计的合理性和准确性提供依据,有效解决工程实际问题成为研究的重中之重。引汉济渭工程是陕西省缓解关中渭河沿线城市和工业缺水问题,而提出的由汉江调水到渭河流域的大型水利工程。椒溪河隧洞工程为穿河段,地形地质相对复杂,采用从支洞向两侧主洞进行开挖的施工方式,隧洞施工期的通风问题比较严重。本文采用数值模拟方法对带有支洞隧洞的通风过程进行模拟,得出以下主要结论:(1)采用压入式通风方式的隧洞,通风后掌子面附近和支洞与主洞的交叉位置存在由多个涡流组成的涡流区,当气体流动通道不顺畅时,涡流区中的涡流大小和位置呈现周期性的变化。涡流的存在对爆破炮烟有一定的阻滞作用,不利于有害物质的排散。(2)隧洞的涡流区影响爆破后产生的有害物质的排散,部分CO等气体残留于涡流区的中心,排出过程较为缓慢,不利于施工人员的进一步施工,影响施工进度。根据隧洞爆破后可能产生的涡流区进行针对性的通风,可以有效的排散隧洞内的污浊空气,提高通风效率。(3)有害气体的排出过程分为移动和扩散,随着通风时间的增加,CO在排出的过程中,隧洞内的CO峰值不断降低,分布范围逐渐增大,文章模拟和预测了隧洞内有害物质降低至安全浓度所需时间的规律,并给出相关的建议。(4)建立了风管漏风的隧洞模型,分析隧洞不同漏风点的漏风量及规律,研究风管漏风对隧道内的流场和浓度场分布的影响,并对漏风量的影响因素进行了一定的研究。
[Abstract]:Tunnel construction is widely used in engineering practice. The harmful substances such as carbon monoxide and dust produced by blasting seriously endanger the health of construction personnel and the normal operation of construction equipment. In order to control the concentration of harmful substances in the tunnel within the safe standard value, ventilation should be carried out in the tunnel. Therefore, ventilation has become a bottleneck restricting construction progress. To study the time and space distribution of gun smoke under ventilation conditions, to provide the basis for the rationality and accuracy of ventilation design, and to effectively solve the practical problems of engineering become the most important part of the research. The Huan-Ji-Wei project is a large-scale water conservancy project from the Hanjiang River to the Weihe River basin proposed by Shaanxi Province to alleviate the water shortage in cities and industries along the Weihe River in Guanzhong. The tunnel of Jiaoxihe River is a river crossing section with relatively complicated topography and geology. The ventilation problem of the tunnel during the construction period is quite serious because of the construction mode of excavation from the branch tunnel to the main tunnel on both sides of the tunnel. In this paper, numerical simulation method is used to simulate the ventilation process of tunnel with branch tunnel. The main conclusions are as follows: (1) the tunnel with pressure-in ventilation, After ventilation, there is a eddy current region in the vicinity of the palm surface and the cross position between the branch tunnel and the main hole. When the gas flow channel is not smooth, the eddy current size and position in the vortex zone change periodically. The existence of eddy current has a certain blocking effect on blasting smoke, which is not conducive to the emission of harmful substances. (2) the eddy current zone of the tunnel affects the emission of harmful substances after blasting, and some gases such as CO remain in the center of the vortex zone, and the discharge process is relatively slow. It is unfavorable to the further construction of the construction personnel and affects the progress of the construction. According to the possible eddy current zone after tunnel blasting, the ventilation can effectively disperse the dirty air in the tunnel and improve the ventilation efficiency. (3) the discharge process of harmful gas can be divided into moving and diffusing. With the increase of ventilation time, the peak value of CO in the tunnel decreases continuously, and the distribution range increases gradually. This paper simulates and predicts the law of the time required for the reduction of harmful substances to the safe concentration in the tunnel. And the relevant suggestions are given. (4) the tunnel model of air tube leakage is established, the leakage quantity and law of different air leakage points in tunnel are analyzed, and the influence of air leakage on the distribution of flow field and concentration field in tunnel is studied. The influence factors of air leakage are also studied.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV554
本文编号：2253283
[Abstract]:Tunnel construction is widely used in engineering practice. The harmful substances such as carbon monoxide and dust produced by blasting seriously endanger the health of construction personnel and the normal operation of construction equipment. In order to control the concentration of harmful substances in the tunnel within the safe standard value, ventilation should be carried out in the tunnel. Therefore, ventilation has become a bottleneck restricting construction progress. To study the time and space distribution of gun smoke under ventilation conditions, to provide the basis for the rationality and accuracy of ventilation design, and to effectively solve the practical problems of engineering become the most important part of the research. The Huan-Ji-Wei project is a large-scale water conservancy project from the Hanjiang River to the Weihe River basin proposed by Shaanxi Province to alleviate the water shortage in cities and industries along the Weihe River in Guanzhong. The tunnel of Jiaoxihe River is a river crossing section with relatively complicated topography and geology. The ventilation problem of the tunnel during the construction period is quite serious because of the construction mode of excavation from the branch tunnel to the main tunnel on both sides of the tunnel. In this paper, numerical simulation method is used to simulate the ventilation process of tunnel with branch tunnel. The main conclusions are as follows: (1) the tunnel with pressure-in ventilation, After ventilation, there is a eddy current region in the vicinity of the palm surface and the cross position between the branch tunnel and the main hole. When the gas flow channel is not smooth, the eddy current size and position in the vortex zone change periodically. The existence of eddy current has a certain blocking effect on blasting smoke, which is not conducive to the emission of harmful substances. (2) the eddy current zone of the tunnel affects the emission of harmful substances after blasting, and some gases such as CO remain in the center of the vortex zone, and the discharge process is relatively slow. It is unfavorable to the further construction of the construction personnel and affects the progress of the construction. According to the possible eddy current zone after tunnel blasting, the ventilation can effectively disperse the dirty air in the tunnel and improve the ventilation efficiency. (3) the discharge process of harmful gas can be divided into moving and diffusing. With the increase of ventilation time, the peak value of CO in the tunnel decreases continuously, and the distribution range increases gradually. This paper simulates and predicts the law of the time required for the reduction of harmful substances to the safe concentration in the tunnel. And the relevant suggestions are given. (4) the tunnel model of air tube leakage is established, the leakage quantity and law of different air leakage points in tunnel are analyzed, and the influence of air leakage on the distribution of flow field and concentration field in tunnel is studied. The influence factors of air leakage are also studied.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV554
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