普立特大桥隧道锚碇区岩体工程地质特性研究  

Geological Characteristics of Rock Masses Engineering in the Tunnel Anchorage Area at Puli Bridge

作　　者：喻正富 夏国邦 王世谷 张奇华[2] 杜胜华 

机构地区：[1]云南普宣高速公路建设指挥部,云南宣威655400 [2]长江科学院水利部岩土力学与工程重点实验室,武汉430010 [3]长江水利委员会长江岩土工程总公司,武汉430010

出　　处：《长江科学院院报》2015年第8期72-77,共6页Journal of Changjiang River Scientific Research Institute

基　　金：云南省交通运输厅科技项目(云交科2011(LH)12-a号)

摘　　要：在建的普宣高速普立特大桥为主跨628 m的悬索桥,其一侧采用隧道锚碇。隧道锚碇区岩体主要存在的工程地质问题是岩体卸荷与岩溶问题。开挖了长120 m的探洞,并在探洞内开展现场岩石力学试验、声波测试和地质描述,获得了岩体物理力学参数与岩体基本质量分级情况。在此基础上,分析了岩体卸荷与岩溶随高程变化和埋深发育的规律。针对岩溶地区建设隧道锚碇可能存在的工程地质问题,探索了一条采用地表地质调查、地质测绘、钻探、洞探、坑槽探、钻孔弹性波测试、勘探斜洞、原位试验钻孔等多种勘探方法的综合勘探技术与分析方法,为隧道锚设计与稳定分析提供了基本依据,可在类似工程中推广。Puli bridge is a large suspension bridge with a main span of 628 m and tunnel-type anchorage on one side. Rock mass unloading and karst problem are the key issues of engineering geology in the tunnel anchorage area. An exploration hole of 120 m long was excavated through the center of the anchorage,and in-situ rock mechanical test,sonic test and geological description were conducted in the exploration hole. The physical and mechanical parameters of rock masses and the classification of basic quality of rock masses were obtained. On this basis,the regularities of rock mass unloading and karst development varying with elevation and embedded depth were analyzed. Comprehensive investigation technologies and analysis methods involving ground surface geological survey,geological mapping,drilling,tunnel excavation,pitting,trenching,elastic wave testing,and in-situ testing are explored in view of the possible engineering geological problems of tunnel anchorage in karst region. These technologies provide fundamental data for the design of tunnel anchorage and the stability analysis,and are worth to be popularized in similar works.

关 键 词：普立特大桥 隧道锚碇 岩体卸荷 岩溶 岩体力学试验 

分 类 号：U452.11[建筑科学—桥梁与隧道工程]