TBM在某引水隧道施工中应用研究

发布时间：2018-06-01 05:17

本文选题：TBM + 不良地质因素　；参考：《长春工程学院》2017年硕士论文

【摘要】：TBM工法是当今世界隧道工程建设中最为先进的施工方法,具有快速、安全、环保等优势被广泛应用于各国交通、水利等部门的地下工程建设中。然而,TBM在具有上述优点的同时,在施工过程中,也存在一些问题,主要表现为两方面,一方面,不良地质因素如软弱围岩变形、隧洞突涌水等,处理措施不当将会发展成严重工程事故,造成巨大人员伤亡和经济损失;另一方面,国内目前仍沿用传统钻爆法以围岩稳定性为主的分级方法,但TBM是利用机械能破岩掘进,在施工过程中,刀盘和护盾对围岩具有挤密作用,使TBM开挖后的隧道可在短时间内保持稳定。因此,原分级方法并不能科学指导TBM施工。综上所述,研究TBM施工中主要工程地质灾害的产生原因、危害及防治措施以及研究适合于开敞式TBM的围岩分级方法,在现代TBM工法隧道技术研究中具有非常重要地位。本文以开敞式TBM为例,结合“吉林中部城市引松供水”项目论述不良地质因素如软弱围岩变形、隧洞突涌水、岩爆等产生的原因,造成的危害并提出处理措施。其中,隧洞突涌水为本项目中最为常见的工程地质灾害,在大量室内试验的基础上,选定堵漏浆液的主要组分及各组分所占的比例,并通过正交试验对配方进行优选。优选配方为:水灰比为0.59,缓凝剂酒石酸的含量为0.25%、PHP溶液的含量为3%,速凝剂铝酸钠的含量为1.6%。该配方性能参数:可泵期为30min,初凝时间96min,终凝时间104min。对优选浆液终凝时形成的结石体进行了渗透系数的测定并对浆液结石体试块进行了1天、7天和28天的抗压强度试验,结果表明该优化配方形成的结石体具有较高的强度和防渗性能,现场应用效果表明,所研制的浆液对“吉林中部城市引松供水”隧道施工项目中的突涌水问题有较好的堵漏效果。依据现场搜集不同桩号岩石的饱和单轴抗压强度、岩体完整性系数、渣料特征、开挖后实际揭露岩面特征,以施工速度为主要标准将原分级方法划分的围岩等级细分为8级,并依据不同等级围岩给出相应的推荐掘进参数。该分级方法在“吉林中部城市引松供水”项目中应用效果较好。
[Abstract]:TBM method is the most advanced construction method in the tunnel engineering construction in the world. It has the advantages of fast, safe and environmental protection and has been widely used in the underground engineering construction of traffic, water conservancy and other departments in various countries. However, while TBM has the advantages mentioned above, there are also some problems in the construction process, which are mainly manifested in two aspects: on the one hand, the bad geological factors such as the deformation of weak surrounding rock, the water gushing of tunnel, etc. Improper treatment measures will develop into serious engineering accidents, resulting in huge casualties and economic losses. On the other hand, the traditional classification method of rock stability is still used in China, but TBM is driven by mechanical energy. In the process of construction, the cutter head and shield have compaction effect on the surrounding rock, so that the tunnel after TBM excavation can be kept stable in a short time. Therefore, the original classification method can not scientifically guide the construction of TBM. To sum up, it is very important to study the causes, hazards and prevention measures of the main engineering geological hazards in TBM construction, as well as the surrounding rock classification method suitable for open TBM. It is of great importance in the research of modern TBM tunnel technology. Taking open type TBM as an example, this paper discusses the causes of bad geological factors, such as deformation of weak surrounding rock, water gushing of tunnel and rockburst, combined with the project of "diversion and Water supply in Central Jilin City", and puts forward some measures to deal with them. The water gushing of tunnel is the most common engineering geological hazard in this project. On the basis of a large number of laboratory tests, the main components and the proportion of each component of the slurry are selected, and the formula is optimized by orthogonal test. The optimum formula is as follows: water cement ratio is 0.59, tartaric acid content is 0.25 and PHP solution content is 3, and sodium aluminate accelerant is 1.6. The formula performance parameters: the pump period is 30 min, the initial setting time is 96 min, and the final setting time is 104 min. The permeability coefficient of the stone formed during the final coagulation of the optimal slurry was measured, and the compressive strength tests were carried out for 1 day, 7 days and 28 days, respectively. The results show that the stone body formed by the optimized formula has higher strength and anti-seepage performance, and the field application results show that, The developed slurry has a good effect on blocking leakage in the tunnel construction project of "diversion and Water supply of Central Jilin City". According to the collection of saturated uniaxial compressive strength, integrity coefficient of rock mass, slag material characteristics and actual exposure of rock surface characteristics after excavation, the grade of surrounding rock which was classified by the original classification method is divided into 8 grades according to the main standard of construction speed. And according to different grade surrounding rock, the corresponding recommended tunneling parameters are given. The classification method has been applied well in the project of "diversion and Water supply of Central Jilin City".
【学位授予单位】：长春工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV554

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