摘要
岩溶地貌形态丰富多样,在岩溶发育地区修建桥梁时,需要详细探明溶洞发育情况并及时采取处治措施,以确保桥梁结构安全。以蛤蟆滩大桥为工程背景,主要从溶洞探测方法、顶板安全厚度分析和采取处治措施等3个方面进行研究。首先采用高密度电法和地质雷达法初步了解溶洞发育情况,然后根据物探结果,通过地质钻探法探明溶洞埋深、跨度、充填物和附近地层结构;利用FLAC 3D对在一定荷载作用下3种不同顶板厚度的结构进行数值计算,分析得出该依托工程溶洞顶板的安全厚度为3.0m;在总结已有的溶洞处理方法基础上,对全充填型溶洞采用注浆法进行加固,最后通过检测表明处理效果良好。
The karst landforms are variable in terms of structure.When constructing bridges in karst areas,it is necessary to investigate in detail the development status of the caves and take timely measures to ensure the safety of the bridge structure.In the paper,the Hamatan Bridge is taken as the project background,the studies are carried out from three aspects:the cavern detection method,the roof safety thickness analysis and the treatment measures.Firstly,the high-density electric method and geological radar method are used to understand the development of the cave.Then,according to the results of geophysical exploration,the depth,span,filling and nearby stratum structure of the cave are proved by geological drilling method.The FLAC 3D is used to numerically calculate the structure of three different roof thicknesses under a certain load,and it is worked out that the safe thickness of the roof of the supporting cave is 3.0 m.On the basis of summarizing the existing cave processing methods,the fully filled cave is reinforced by grouting method and finally pass the testing which proves that the treatment effect is good.
作者
杨晓华
李爱明
李吉富
YANG Xiao-hua;LI Ai-ming;LI Ji-fu(Chang’an University,Xi'an 7100641 China;Inner Mongolia Transport Design and Research Institute Co.Ltd.,Hohhot 010010,China)
出处
《公路》
北大核心
2020年第10期100-106,共7页
Highway
关键词
桥梁工程
桩基下伏溶洞
顶板稳定性评价
数值模拟
注浆法
处治
bridge engineering
karst cave beneath pile foundation
evaluation of top slab stability
numerical simulation
grouting method
treatment
