综合勘探方法确定浅层地基土承载力特征值对比分析

Comparative Analysis of Determining the Bearing Capacity Characteristic Value of Shallow Foundation Soil by Integrated Exploring Method

研究目的：不同的勘探方法在同一地点取得的承载力值存在差异，单一勘探方法在缺乏经验的地区显得尤其不足，本文旨在通过对比分析天津泰达科技工业区进行的综合勘探试验成果，以取得各勘探方法之间的系数关系，从而作为确定承载力特征值的依据，进而表明综合勘探方法在岩土工程勘察项目中的优势。研究结论：静力触探结果与载荷试验结果最为接近，钻探取样结果偏差较大，轻型动力触探随深度增加结果偏离值增大；通过对试验数据的对比分析，得出的系数关系为：静力触探对比系数为0．9～1．1，钻探取样对比系数为0．5～1．2，轻型动力触探对比系数为0．6～1．0。

Research purposes： Different exploring methods result in different values in the same place. Using one method is not enough, especially in the areas we are not very familiar with. This paper comparatively analyzes the experimental achievements in integrated exploring for Tianjin TEDA Technological and Industrial District for the purpose of obtaining the coefficient relation among some exploring methods to provide the basis for confirming the characteristic value of bearing capacity and indicating the advantage of integrated exploring methods in geotechnique survey. Research conclusions：The value from the cone penetration test is approximate to that from loading test. The value from the drill and sampling has a large deviation. The value deviation from the general dynamic penetration will become larger as the depth increases. The coefficients are as follows ： 0.9 - 1.1 for the cone penetration ; 0.5 - 1.2 for the drill and sampling; 0.6 - 1.0 for the general dynamic penetration.