安六铁路对门寨隧道大型溶洞群形成机理分析及整治方案设计  

Formation Mechanism Analysis and Treatment Scheme Design of Large Karst Cavern Group in Duimenzhai Tunnel of Anshui-Liupanshui Railway

作　　者：周关学[1] 王科[1] 冯涛[1] ZHOU Guanxue;WANG Ke;FENG Tao(China Railway Eryuan Engineering Group Co.Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道建筑》2020年第11期75-79,共5页Railway Engineering

基　　金：国家重点研发计划(2016YFC0802206)。

摘　　要：安顺至六盘水高速铁路对门寨隧道施工揭示出大型溶洞群。为确保隧道施工及运营安全,对隧址区开展了工程地质及水文地质补充调查,采用测量、物探、钻探等多种方法查明了溶洞形态及特征,观测了地下暗河水量及溶腔壁水位,并对溶洞群形成机理进行了分析,设计出整治方案。具体措施为:地下水位低的隧底大型溶腔采用“弃渣+C20混凝土”分层间隔回填;地下水位高的大溶腔采用桩筏结构处理;洞身溶腔采用混凝土护墙或C20混凝土回填密实,溶腔壁采用锚网喷防护;地下水来水侧设置泄水洞。经现场实施,该方案整治效果良好。Large karst cave group was revealed during the construction of Duimenzhai Tunnel of Anshun-Liupanshui high speed Railway.In order to ensure the safety of construction and operation of the tunnel,supplementary investigations of engineering geology and hydrogeology were carried out in the tunnel area.The morphology and characteristics of karst caves were found out by various methods,such as surveying,geophysical prospecting and drilling,etc.The water volume of the underground river as well as the water level of the cavern wall were observed.The formation mechanism of karst cave group was analyzed,and the treatment scheme was designed.The specific measures are as follows.Large karst caves at the tunnel bottom with low groundwater level shall be treated with“waste slag+C20 concrete”layered interval backfilling,and the ones with high groundwater level shall be treated with pile-raft structure.The karst caves across by the tunnel shall be treated by concrete retaining wall or backfilled densely with C20 concrete,and the cave wall shall be supported by bolt-mesh-spurting.The drainage tunnel shall be set on the inflowing side of the groundwater.The scheme shows a good treatment effect after implementation on site.

关 键 词：铁路隧道 整治方案设计 现场试验 大型溶洞群 机理分析 分层间隔回填 桩筏结构 泄水洞 

分 类 号：U451[建筑科学—桥梁与隧道工程]