武汉长江Ⅰ级阶地原状土样获取技术研究

Research on technology of obtaining undisturbed soil samples from Wuhan first stage terrace of the Yangtze River

本文分析了原状土样获取的技术标准现状和行业现状,研究了钻进方式、取样工具选取的适宜性综合分析、土样的封装及运输。对比试验研究表明,在武汉长江Ⅰ级阶地粘土层段采用锤击钻进配合使用敞口薄壁取土器,在砂土层采用锤击和回转组合钻进配合使用内置环刀取土器,辅以胶盖自封和胶带密封,取得的原状样品在现场质量评测、室内样品制备性和试验性方面均有比较良好的表现,基于此套方法获取的原状样原始结构受扰动较小,土的原始结构力保持良好。

In this paper,the current technical standards and industry status for obtaining undisturbed soil samples is introduced,moreover,the drilling methods,comprehensive analysis of suitability for sampling tool selection,soil sample packaging and transportation methods are studied.The comparative experimental research indicates that the original obtained samples show excellent performance in on‑site quality evaluation,indoor sample preparation,and experimental performance under the following two conditions in Wuhan first stage terrace of the Yangtze River.In clay laye,hammer drilling combined with open thin‑walled soil samplers is adopted,while in sandy soil layer,the hammer and rotary drilling combined with built‑in ring cutter soil sampler is used supplemented by rubber cover and tape sealing.Based on this method,the original structure of the sample is less disturbed,and the original structural force of the soil is also well maintained.