利用标贯试验击数确定岩土参数的探讨

标准贯入试验目前已广泛应用于各类工程勘察施工,然而在冲积平原等湖泊、河流和沿海地区常出现标贯击数确定的岩土物理、力学性质与土工试验和静力触探结果不匹配的情况。本文结合长江左岸I级阶地上的具体工程案例,同时对标贯试验、土工试验和静力触探的试验结果进行对比分析,而后对标贯试验结果进行杆长修正,使三者确定的岩土性能指标更匹配,并对标贯试验结果出现误差的原因进行了分析。研究成果对同类工程勘察施工具有参考价值。

Discussion about the Determination of Rock and Soil Properties by Blow Counts of SPT

Standard penetration test(SPT)has been widely applied in various types of engineering investigation and construction.However,the physical and mechanical properties of rocks and soils determined by the blow counts of SPT usually do not match the results of indoor geotechnical test and static cone penetration test(CPT),especially when the construction site locates at alluvial plains(e.g.lakefront,riverside and costal area,etc.).In view of this situation,a specific engineering project which locates at the first terrace on the left bank of the Yangtze River was analyzed in this paper to compare and discuss the results of SPT,indoor geotechnical test and static CPT simultaneously.And then,the results of SPT was corrected according to its rod length to make sure the physical and mechanical properties of rocks and soils obtained by the above mentioned three ways match each other better.Besides,the reasons for the error of SPT tests were analyzed.