标准贯入试验在中泰铁路中的应用与研究

中泰铁路作为国外重点项目,具有地质勘察时间紧、任务重、成本高的特点。标准贯入试验(SPT)作为一种操作简单,指标可靠易用的方法可有效解决上述问题。如何将国外操作工艺所获得的指标合理地运用到我国设计理念中,显得极为重要。从SPT的原理入手,通过对有国内成熟经验地区的SPT数据与地层主要物理力学指标的对比分析,而后结合该项目国内外的SPT对比试验数据进行数据拟合,得出SPT与常用物理力学指标之间的经验公式并将其应用于设计中。同时发现随着深度的增加,N_泰相对N_中来说数据偏大的现象愈加明显,并从钻探方法及SPT方法两个方面进行综合分析,最终得出SPT方法的优越性及日后应用中的注意事项和进一步的研究方向。

Application and Research of Standard Penetration Test in China-Thailand Railway

China- Thailand railway is a key project abroad. It is characterized by tight schedule,heavy task and high cost in geological survey. The standard penetration test( SPT) can effectively solve the problem due to its simple operation and credible indicators. Thus,how to introduce the indexes of the operation process obtained abroad in the domestic design becomes particularly important. Based on the principle of SPT,the data of SPT and the main physical mechanic indexes of strata obtained in areas with mature experiences of China are compared and analyzed,and the relevant parameters are fitted with the contrast test date from home and abroad to draw up the empirical formula between the SPT and the general physical mechanic indexes,which are to be applied to the design. Meanwhile,it is found that the phenomenon of the N- THA larger than the N- CHA is more obvious with the increase in depth. The advantages of SPT method and the precautions in application are identified based on the analysis of both drilling method and SPT method,and future studies are addressed.