岩溶区客运专线桥梁桩基地质勘察方法与技术浅析

The Geological Survey Method and Technology of Bridge Foundation Using Pile in the Passenger Dedicated Railway in Karst Area

灰岩分布区岩溶发育易引发地面下沉、开裂,是地质灾害及路、桥、建筑物等工程设施的主要隐患,铁路客运专线桥梁工程一般选用桩基础的形式通过;岩溶作为一种常见的不良地质,其发育特征具有一定的规律性,但在较小范围的特定区内,其出现有着随机性,桥梁墩台勘察若依靠逐桩钻探不仅投入较大,也难以达到理想的效果。本文结合岩溶区客运专线勘察设计的经验,阐述了通过利用定测阶段钻孔和采用跨孔弹性波CT优化布置钻孔数量及位置的综合勘探方法,可以用最少的工作量则能全面、准确地揭示桥梁墩台地质情况,满足桥梁专业设计需求。

It is very easy to lead to ground subsidence, cracking in the distribution area of karst, also it is the main risks of geological disasters, and roads, bridges, buildings and other engineering facilities,so the passenger dedicated railway bridge project used by in the form of pile foundation generally.As a common adverse geology, karst with a certain regularity in the development features, but in a smaller range of specific areas, it has appeared random, if only relying on the bridge piers investigation by drilling one by one, it is difficult to achieve the desired results. By the experience＇of survey and design of the passenger dedicated railway in krast area,this paper explained the integrated exploration approach by the use of drilling in testing phase and Cross-hole elastic wave CT to optimize the number and location of drilling, revealed the geology of bridge piers with the least amount of work fully and accurately, meeting the needs of the bridge design.