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文章结合湖南常吉高速公路岩溶地区5座大中桥钻孔灌注桩的钻孔施工处理经验,阐述了在复杂岩溶地质条件下大桥桥基穿越多层溶洞和尺寸较大且充填物为流塑状砂性土的溶洞钻孔施工的几点处理方法。在当前勘探方法和手段及准确程度有待提高的情况下,应尽量采取其他类型桥基代替钻孔灌注桩基。选用质量好的钻机和钻头对保证施工进度也是一个重要环节。穿越多层溶洞尤其是穿越呈富水流塑状填充物的高大溶洞的钻孔施工,目前尚未且很难形成统一工法,有待各有关单位进一步总结经验,对具体情况进行认真的研究,以期取得更加规范和有效的施工方法。
In this paper, combined with experience of drilling construction of five large and medium-sized bored piles in the karst area of Changji Expressway in Hunan Province, this paper expounds that under the complex karst geological conditions, the bridge foundation passes through multi-layered karst caves, How to deal with the construction of cave in sand soil. In the current exploration methods and means to be improved and the accuracy of the situation should be taken to replace other types of bored pile foundation. Selection of good quality drilling rig and drill bit to ensure the progress of the construction is an important part. Through the multi-layer karst cave, in particular, through the drilling of a large cave filled with water flow plastic filler, it is not yet yet difficult to form a unified method, the relevant units pending further summary of experience, the specific circumstances of a serious study in order to achieve more Standardized and effective construction methods.