静力触探估算安徽省沿江平原黏性土物理力学性质指标方法研究

Determination of physical and mechanical property indexes of cohesive soils in hills and plains along the Yangtze River in Anhui Province based on CPT

静力触探是确定土层物理力学性质指标的手段之一,但应与地区经验相结合。文章搜集了安徽省沿江丘陵平原地区百余份工程勘察资料,计算了主要土层黏性土的比贯入阻力ps的算术平均值、厚度加权平均值和最小平均值,分析了3种统计平均值和各常见物理力学性质指标的统计学特征及其相关性,并逐一进行拟合和分析。结果表明:3种统计平均值的分布特征都非常接近,并无明显差异,而各常见物理力学性质指标的分布特征各异,但各平均值与大多数的常见物理力学性质指标均显著相关;ps的最小平均值与常见物理力学性质指标间的拟合效果最好,且检验结果表明拟合回归方程显著,因此研究区黏性土层的主要物理力学性质指标可用ps的最小平均值按该文得到的经验公式确定。文章最后制定了根据ps值划分黏性土稠度状态的方案。

Cone penetration test(CPT)is a method to determine the physical and mechanical property indexes of soil layers,but it should be combined with regional experience.In this paper,more than 100 engineering investigation data of the hills and plains along the Yangtze River in Anhui Province are collected,the arithmetic means,thickness weighted means and minimum means of specific penetration resistance ps of cohesive soils(the main soil layers in the area)are calculated.Then,the statistical characteristics and correlation of three kinds of statistical average values and common physical and mechanical property indexes are analyzed,and the fitting and analysis are carried out one by one.The results show that the distribution characteristics of the three statistical average values are very close,and the distribution characteristics of the common physical and mechanical property indexes are different from each other,but the average values are significantly related to most of the common physical and mechanical property indexes;the fitting effect between the minimum mean of ps and the common physical and mechanical property indexes is the best,and the test results show that the fitting regression equation is significant which can be used to determine the main physical and mechanical properties of cohesive soils in the study area by the minimum mean of ps.Finally,the scheme of dividing the consistency state of cohesive soils according to ps is established.