水平旋喷超前预支护加固技术在隧道富水粉细砂层施工中的应用
发布时间：2019-05-06 13:46
【摘要】：水平旋喷在国外已成功地应用于各种软弱不良地层的预支护加固中。最近几年,水平高压旋喷技术在国内隧道软弱围岩加固中应用较为广泛,该技术是在常规旋喷技术的基础上,发展起来的一项新的地层加固施工技术。措施不到位,不但危及施工安全,甚至会影响到运营安全。而超前预加固技术不仅可以提高软弱地层的强度和围岩稳定性,更重要的是可以保证在安全的前提下高效、顺利地完成施工任务。为克服在地下水富集的粉细砂层围岩中施工存在困难的技术难题,采用超前水平旋喷技术,对隧道内的富水粉细砂软弱地层进行超前预加固,形成的固结体不仅可以提高桩体周围的岩体强度,而且起到了很好的防渗止水效果,成功解决了桃树坪隧道富水粉细砂层中存在的施工难题,具有广阔的应用前景。本文依托兰榆铁路桃树坪隧道工程,通过对隧道工程围岩特性研究,对水平旋喷超前预加固技术和掌子面稳定性进行初步分析,主要内容包括:1、分析探讨了富水第三系粉细砂层成因环境、物质组成、结构构造、成岩程度以及隧道开挖后,围岩自稳性差,产生大变形,发生外挤、坍塌、塑化、流变、甚至涌砂、涌水现象的根本原因。2、对水平旋喷桩预支护技术作用机理进行说明,同时对水平旋喷桩技术方案进行一定的分析,总结了该工法的施工特点,工艺流程,参数控制,现场施工常见问题及处理措施,最后对水平旋喷效果进行分析得出水平旋喷桩有更好的经济效益,并对稳定围岩的稳定起到了很好的作用。3、通过对不同断面进行监控分析,各断面的围岩压力、接触压力、二衬钢筋应力值均处于压力范围内,采用水平旋喷超前预加固,围岩变形、收敛值减少,有效的控制了隧道渗水。
[Abstract]:Horizontal rotary shotcrete has been successfully applied to the pre-supporting and strengthening of various weak and poor strata abroad. In recent years, horizontal high-pressure rotary jet technology has been widely used in soft surrounding rock reinforcement of tunnels in China. This technology is a new stratum reinforcement construction technology developed on the basis of conventional rotary injection technique. Measures are not in place, not only endanger the safety of construction, and even affect the safety of operations. The advanced pre-reinforcement technology can not only improve the strength of weak strata and the stability of surrounding rocks, but also ensure the high efficiency and smooth completion of construction tasks on the premise of safety. In order to overcome the difficult technical problems existing in the construction of the surrounding rock of fine sand bed enriched in groundwater, the advance horizontal jet technique was used to pre-reinforce the soft strata with rich water powder and fine sand in the tunnel, and the water-rich fine sand in the tunnel was pre-strengthened in advance. The consolidation body can not only improve the strength of rock mass around the pile, but also play a good anti-seepage and water-stop effect, and successfully solve the construction problems existing in the water-rich fine sand layer of Taoshuping Tunnel, which has a broad application prospect. In this paper, relying on the Taoshuping tunnel project of Lanyu Railway, through the study of the surrounding rock characteristics of the tunnel engineering, a preliminary analysis is made on the pre-strengthening technology and the stability of the palm surface of the horizontal rotary jet prereinforcement technology. The main contents are as follows: 1, The genetic environment, material composition, structure, diagenetic degree and tunnel excavation of water-rich Tertiary fine silty sand are analyzed and discussed. The surrounding rock has poor self-stability, large deformation, extruding, collapsing, plasticizing, rheological, and even sand gushing after tunnel excavation. 2. Explain the mechanism of horizontal rotary jet grouting pile pre-supporting technology, at the same time, analyze the technical scheme of horizontal rotary jetting pile, summarize the construction characteristics, technological process and parameter control of the construction method, and make an analysis of the technical scheme of horizontal rotary jetting pile, and summarize the construction characteristics, technological process and parameter control of this construction method. The common problems and treatment measures in site construction are discussed. Finally, it is concluded that horizontal rotary jet pile has better economic benefit and has a good effect on stabilizing surrounding rock. 3, through monitoring and analysis on different sections, the horizontal rotary jet pile has a better economic benefit. 3, through the monitoring and analysis of different sections, it is concluded that the horizontal rotary jet pile has a better economic benefit. The surrounding rock pressure, contact pressure and second lining reinforcement stress value of each section are all in the range of pressure. Horizontal rotary jet is used to pre-reinforce the surrounding rock, deformation of surrounding rock, decrease of convergence value, and effective control of tunnel seepage.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.7
本文编号：2470222
[Abstract]:Horizontal rotary shotcrete has been successfully applied to the pre-supporting and strengthening of various weak and poor strata abroad. In recent years, horizontal high-pressure rotary jet technology has been widely used in soft surrounding rock reinforcement of tunnels in China. This technology is a new stratum reinforcement construction technology developed on the basis of conventional rotary injection technique. Measures are not in place, not only endanger the safety of construction, and even affect the safety of operations. The advanced pre-reinforcement technology can not only improve the strength of weak strata and the stability of surrounding rocks, but also ensure the high efficiency and smooth completion of construction tasks on the premise of safety. In order to overcome the difficult technical problems existing in the construction of the surrounding rock of fine sand bed enriched in groundwater, the advance horizontal jet technique was used to pre-reinforce the soft strata with rich water powder and fine sand in the tunnel, and the water-rich fine sand in the tunnel was pre-strengthened in advance. The consolidation body can not only improve the strength of rock mass around the pile, but also play a good anti-seepage and water-stop effect, and successfully solve the construction problems existing in the water-rich fine sand layer of Taoshuping Tunnel, which has a broad application prospect. In this paper, relying on the Taoshuping tunnel project of Lanyu Railway, through the study of the surrounding rock characteristics of the tunnel engineering, a preliminary analysis is made on the pre-strengthening technology and the stability of the palm surface of the horizontal rotary jet prereinforcement technology. The main contents are as follows: 1, The genetic environment, material composition, structure, diagenetic degree and tunnel excavation of water-rich Tertiary fine silty sand are analyzed and discussed. The surrounding rock has poor self-stability, large deformation, extruding, collapsing, plasticizing, rheological, and even sand gushing after tunnel excavation. 2. Explain the mechanism of horizontal rotary jet grouting pile pre-supporting technology, at the same time, analyze the technical scheme of horizontal rotary jetting pile, summarize the construction characteristics, technological process and parameter control of the construction method, and make an analysis of the technical scheme of horizontal rotary jetting pile, and summarize the construction characteristics, technological process and parameter control of this construction method. The common problems and treatment measures in site construction are discussed. Finally, it is concluded that horizontal rotary jet pile has better economic benefit and has a good effect on stabilizing surrounding rock. 3, through monitoring and analysis on different sections, the horizontal rotary jet pile has a better economic benefit. 3, through the monitoring and analysis of different sections, it is concluded that the horizontal rotary jet pile has a better economic benefit. The surrounding rock pressure, contact pressure and second lining reinforcement stress value of each section are all in the range of pressure. Horizontal rotary jet is used to pre-reinforce the surrounding rock, deformation of surrounding rock, decrease of convergence value, and effective control of tunnel seepage.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.7
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