复线隧道爆破振动信号分析与爆破施工实践

发布时间：2018-05-20 04:30

本文选题：爆破震动 + 复线隧道　；参考：《太原理工大学》2014年硕士论文

【摘要】：随着社会经济的快速发展,我国的经济和科技水平也有了突飞猛进的进步,经济发展需要大量的矿山开采、水利水电的开发以及各种公路、铁路等基础设施的建设,这些工程中涉及到大量的隧道开挖。另一方面隧道开挖的环境也越来越复杂,除隧道上方的建筑外常常碰到平行的既有隧道。复线隧道爆破产生的振动对既有隧道的影响一般都比较大,相当一部分的爆破震动对邻近既有隧道造成损伤,大大减低了既有隧道的使用寿命,因此必须对隧道爆破振动进行控制。本文通过根据对既有隧道的爆破振动信号分析,确定了控制振动的关键所在,确保复线隧道施工的安全,文中简单介绍了分析爆破振动信号的几种方法(1)快速傅里叶变换(2)小波变换(3)HHT变换,发现HHT方法是最适合隧道爆破振动信号的分析方法。通过对复线隧道中既有隧道爆破震动信号采集,运用matlab数值分析计算采用HHT法分解爆破震动振速信号,将经验模态函数分解成固有模态函数,来确定爆破振动方案的可行性,提出科学可靠安全的爆破方案,并指导后续施工。基于新风平岭隧道爆破掘进施工工程,采集了爆破掘进作业中既有隧道迎爆侧和背爆侧的墙中、底板测点的爆破震动波形,通过对振动测试数据和数值模拟数据的对比分析,发现隧道爆破振动的如下特点：迎爆侧受爆炸应力波的直接入射影响径向质点振速大于其它2个方向的振速；迎爆侧边墙偏上为最危险区,起拱处次之,底板相对安全；根据分析结果优化了爆破参数,提高了施工进度,同时也保证既有隧道的安全运营。
[Abstract]:With the rapid development of social economy, the level of economy and science and technology of our country has also made rapid progress. Economic development requires a large amount of mining, water conservancy and hydropower development, as well as the construction of various basic facilities such as roads, railways, etc. These projects involve a large number of tunnel excavations. On the other hand, the environment of tunnel excavation is becoming more and more complicated, except for the buildings above the tunnel, parallel existing tunnels are often encountered. The vibration produced by blasting in double-track tunnel has a great influence on the existing tunnel, and a considerable part of the blasting vibration causes damage to the adjacent existing tunnel, which greatly reduces the service life of the existing tunnel. Therefore, the blasting vibration of the tunnel must be controlled. Based on the analysis of blasting vibration signals of existing tunnels, the key to control vibration is determined in this paper to ensure the safety of double-track tunnel construction. In this paper, several methods for analyzing blasting vibration signal are introduced in this paper: (1) Fast Fourier transform (FFT) wavelet transform (HHT). It is found that HHT method is the most suitable method for analyzing blasting vibration signal of tunnel. By collecting the blasting vibration signal of the existing tunnel in the double-track tunnel, using the matlab numerical analysis method to decompose the blasting vibration velocity signal and decomposing the empirical mode function into the inherent modal function, the feasibility of the blasting vibration scheme is determined. A scientific, reliable and safe blasting scheme is put forward, and the subsequent construction is guided. Based on the blasting tunneling construction of Xinfeng Pingling Tunnel, the blasting vibration waveforms of the measuring points of the bottom plate in the wall of the existing tunnel blasting side and the back blasting side in the blasting tunneling operation are collected, and the vibration test data and the numerical simulation data are compared and analyzed through the comparison and analysis of the vibration test data and the numerical simulation data. The characteristics of blasting vibration of tunnel are as follows: the vibration velocity of radial particle is larger than that of the other two directions by the direct incident of explosion stress wave on the side of the tunnel, the wall on the side of the face of the explosion is the most dangerous area, the arch is the second, and the floor is relatively safe. According to the analysis results, the blasting parameters are optimized, the construction progress is improved, and the safe operation of the existing tunnels is ensured.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.6

【参考文献】