Construction Technology And Test Of Bridge Pile Foundation In Special Cave Area

Since the mid-1990 s,with the large-scale investment in public infrastructure construction in China,large-scale bridges and various super high-rise buildings have sprung up everywhere,and large-scale buildings are immediately coming up with structural requirements.More and more high,the pile foundation is widely used as a simple and efficient foundation.Bored piles have many advantages such as simple construction process,low construction risk,fast pile-forming speed,and low requirements for mechanical equipment.Therefore,they have been widely adopted in the construction of various structures.In the actual application process,subject to the actual geological conditions,there are many deficiencies in the construction process,which poses great risks to the quality and safety of the pile foundation hole.Therefore,it is very necessary at this stage for the bored pile.Further study of the operating techniques and pile-based testing to better guide the actual construction.There are many types of karst caves and their generation principles.Compared with the general address,the karst area has too many uncertain factors,which makes it impossible to clearly define the geological conditions,which brings great difficulty to the actual design and construction of the project.And bothered.In this paper,the Yangmeizhou Bridge pile foundation is taken as an engineering example to study the caves and complex geological conditions in this area,to carry out complex cave stability and pile foundation research in the cave development area,and to analyze the construction and detection of large bridge pile foundations in the cave area.The field provides a more appropriate theoretical basis and more detailed technical support for similar projects.This has very important engineering guiding implications for the construction and testing of extra large bridge pile foundations in karst development areas.This paper expounds the basic principles of karst,which includes various conditions for the formation of karst caves,various types of karst caves and various forms,the causes and types of karst formations;the effects of karst caves on bridge pile foundations and corresponding Treatment measures,which also pointed out the influence of cave water on the pile foundation of the bridge,the influence of the karst cave on the pile foundation of the bridge,and various treatment measures of the cave.In this paper,Yangmeizhou Bridge is used as an engineering example to study the formation mechanism and investigation of karst caves.According to the actual situation,a variety of different measures have been taken to deal with it,and a better karst treatment method has been formed,which is further verified by ultrasonic testing.The integrity of the pile foundation provides a good reference value for similar projects.