摘要
为解决GZ隧道洞口段道床隆起引起列车限速运行的问题,采用人工测量及补勘等手段,探索道床隆起病害的原因,并提出相应的整治措施;采用人工及自动测量方法监测道床隆起整治前后的道床变形,以分析评价道床隆起的整治效果。结果表明:1)洞口段位处浅埋、偏压和基底承载力不均的组合工况中是道床隆起的主要外因,隧道开挖引起的地层偏压调整不充分,偏压力对隧底结构的挤压造成道床横断面出现不同程度的隆起; 2)针对明洞段地基不均和隧道洞口浅埋且地形偏压等主要因素,提出道床隆起整治采用明洞耳墙底注浆、洞外锚固桩、道床锚杆等加固措施; 3)自动监测成果表明,整治前K1966+310. 0～+322. 5段测点L6～L8、L10、L11的上拱速率为1. 38～3. 70 mm/月,整治后2018年2月15日—9月7日测点L6～L8、L10的上拱速率为0. 53～0. 69mm/月,上拱速率减小了56. 6%～85. 1%,2018年5月13日—9月7日测点L11未继续上拱; 4)人工监测成果表明,2018年3月22日—9月7日,除了K1966+320. 0测点B2和K1966+325. 0测点B2明显隆起外,K1966+300～+340段各测点上拱缓慢,且部分测点有小量值沉降; 5)据目前监测成果,初步分析认为本段道床隆起整治目标未完全实现,道床变形监测仍在继续,应继续进行整治效果监测与分析。
In order to solve the problem of train speed limitation induced by track bed heaving in the entrance section of GZ Tunnel,the causes for heaving disease of track bed are explored by using manual monitoring method and supplementary exploration,and corresponding countermeasures are proposed.The deformation of track bed before and after the treatment on track bed heaving is observed by manual and auto-monitoring,and the effects of the treatment on the track bed heaving are evaluated.The results show that:(1)The main external causes of the track bed heaving are considered to be the combined working conditions of shallow-buried depth,unsymmetrical pressure and uneven bearing capacity at the entrance section of the tunnel;the tunneling-induced unsymmetrical pressure of the stratum is not fully adjusted,and the compression of unsymmetrical pressure on tunnel bottom structure causes the heaving of cross-section of track bed.(2)Considering the main factors such as the uneven foundation of the open-cut tunnel section and the shallow-buried depth and unsymmetrical pressure of the tunnel entrance,etc.,some countermeasures such as the grouting of the ear wall bottom of the open-cut tunnel,anchoring piles outside the tunnel,and rockbolt reinforcement of the track bed are proposed to prevent the track bed heaving.(3)The auto-monitoring results show that the heaving rate of the monitoring points No.L 6 to L 8,L 10 and L 11 at K1966+310.0^+322.5 ranges from 1.38 mm to 3.70 mm per month before the treatment,and that of the monitoring points No.L 6 to L 8 and L 10 ranges from 0.53 mm to 0.69 mm per month from Feb.15th to Sep.7th,2018 after the treatment;and the heaving rate is reduced by 56.6%to 85.1%.However,no further heaving is found at the monitoring point No.L 11 from May 13rd to Sep.7th,2018.(4)The manual monitoring results show that the monitoring points at K1966+300^+340 heave slowly and some monitoring points show small settlement,except for the obvious heaving of the monitoring points No.B 2 at K1966+320.0 and K1966+325.0
作者
李奎
刘凯
LI Kui;LIU Kai(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610083,Sichuan,China)
出处
《隧道建设（中英文）》
北大核心
2018年第11期1910-1918,共9页
Tunnel Construction
关键词
客运专线
隧道洞口
道床隆起
病害整治
浅埋偏压
锚固桩
锚杆加固
自动监测
人工监测
passenger-dedicated railway
tunnel entrance
track bed heaving
disease treatment
shallow-buried unsymmetrically-pressured tunnel
anchoring pile
rockbolt reinforcement
auto-monitoring
manual monitoring
