摘要
圆梁山隧道是渝怀铁路线上最长的隧道,隧道主要穿越毛坝向斜核部、桐麻岭背斜和冷水河浅埋段,发育有毛坝向斜、桐麻岭背斜及伴生断裂。受地质构造影响,毛坝向斜存在P2w+c和P1q+m两层承压水,据定测深孔钻探表明,承压水压力高达4.42～4.60MPa。根据地质勘探资料及周边环境情况,预估隧道正常涌水量为98000m3/d,最大涌水量为145000m3/d。在圆梁山隧道施工中,先后在桐麻岭背斜和毛坝向斜遇到了5个深埋充填型溶洞,溶洞形态各异,充填介质不同,有粉细砂、粉质黏性土和黏土多种,其中,2#溶洞充填介质为粉细砂层,其施工难度最大。受高压、富水、岩溶等诱导因素影响,施工中多次突发了大规模的涌水、涌砂和涌泥等工程灾害,给工程的安全顺利施工造成了极其严重的影响。针对2#溶洞平导高压富水粉细砂层地质特点,研究出了由普通水泥单液浆、超细水泥单液浆、普通水泥–水玻璃双液浆、超细水泥–水玻璃双液浆、TGRM单液浆和HSC单液浆组成的注浆材料配套体系,并对2#溶洞平导施工过程中出现的2次较为被动的后退回填局面以及施工中的注浆设计、注浆参数选择和注浆效果检查评定进行了总结分析,以期对类似工程的设计、施工提供借鉴价值。
Yuanliangshan tunnel, with a total length of 11.068 km, is the longest runnel on Chongqing-Huaihua railway/The tunnel goes mainly through the core of Maoba syncline core, Tongrnaling anticline and Lengshuihe shallow-buried section, where the Maoba syncline, Tongmaling anticline and ruptured zones develop. Because of the influences ori the geological structures, there exist two layers of artesian water of P2w＋c and Plq＋m. The deep-hole drilling exploration shows that the pressure of the artesian water reaches up to 4.42 - 4.60 MPa. On the basis of the exploration data and the surrounding environment, it is estimated that the normal water inflow of the complete tunnel reaches 98 000 m^3/d with the maximum water inflow of 145 000 m^3/d. During the construction of Yuanliangshan tunnel, 5 karst caves have been encountered in Tongmaling anticline and Maoba syncline, which have different shapes and different filling materials such as fine silty sand, silty clay and clay. Among them, the karst cave No.2 is the most difficult for it is filled silty fine sand layers. Due to the influence of the high pressure, rich water and karst geology, several large-scaled sudden water inflows, sand inflows and mud inflows are encountered, which have imposed serious influences on the safe and successful constructions of the tunnel. By means of silty fine sand layers, the paper researches the grouting systems that consists of cement single liquid grouting material, MC super and thin cement single liquid grouting materials, cement and water glass of liquid grouting materials, MC super and thin cement and water glass of liquid grouting materials, TGRM single liquid grouting material, and HSC single liquid grouting material, respectively. The grouting design, grouting parameter, grouting result check of the karst cave No.2 and two passive countermarch returns to fill the situation are analyzed, which can provide an important reference for future tunnels under similar geological conditions.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2006年第1期191-198,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
铁道部科研项目(2001G009)
关键词
隧道工程
深埋充填型溶洞
高压富水粉细砂层
注浆材料
施工技术
tunneling engineering
deep-buried karst caves of filling type
silty fine sand layers of high pressure and rich water
grouting material
construction technique
