摘要
软基建坝必须对软基的结构、分层、物理力学性质、渗透性作全面分析研究。其中的砂卵石层取样,应力求保持样品不受扰动。常规法采用试坑、浅(竖)井取样,取样效果虽好,但受深度的限制。国外采用冻结法、化学灌浆法、钢板桩法钻取水下原状样,但耗资巨大,难以实施。研制一种新的钻进方法来提高砂卵石层取样的原状性是非常必要的。
When constructing a soft foundation dam, the structure, layer, mechanical property and permeability of bases should be studied. Specially, in sand and gravel sampling, the original layers, composition and grain gradation should be kept. It is a difficult problem all the time to take undisturbed soil sample in sand and gravel layer during constructing the soft dam. Generally, sampling is in the test pit and the shaft, but the sample depth is limited. In other countries, frozen method, chemical grouting method and steel sheet pile method are used for the sampling gradation under water. But these methods are difficult to be put into effort, because cost is too much. In order to improve the undisturbed property in sand and gravel layer sampling, a new drilling method is necessary to be studied so as to satisfy the grain grading analysis.
出处
《地质与勘探》
CAS
CSCD
北大核心
2003年第2期91-94,共4页
Geology and Exploration
基金
九五"攻关项目(编号:96-221-01-03)资助。
关键词
砂卵石层
空气潜孔锤
渗透性
冻结法
化学灌浆法
取样技术
undisturbed soil sample,grain gradation,down-hole hammer drilling,big aperture,non-consolidation washing
