标准击实试验最佳含水量和最大干密度的理论计算

Numerical method to result analysis of indoor standard compaction test

针对目前公路路基填土中利用室内标准击实试验确定最大干密度和最佳含水量时存在的随意性问题 ,在对大量的试验结果分析的基础上 ,提出利用三点二次插值函数的方法建立土的干密度和含水量的函数关系。从而为求解土的最大干密度和最佳含水量的数值解的确定提供了理论依据。由插值函数的误差分析可以看出 ,用插值函数数值解确定标准击实试验结果是完全可行的 ,该方法思路明确、计算简便 ,可望在公路路基填土工程压实质量指标的确定中得到推广和应用。

As to the problem of ambiguity when indoor standard compaction test is used to determine the biggest dry density and the optimum moisture content in subgrade filling, on the basis of many test result analyses, the paper presents the method of using three point two time interpolation function to establish the functional relation between the biggest dry density and the optimum moisture content so as to provide the theoretical basis for the determination of the biggest dry density and the optimum moisture content. Through the error analysis of interpolation function, it is clear to see that it is feasible to use interpolation function to decide the result of the standard compaction test. This method is clear in thoughts and simple in calculation and is expected to put into use in the determination of compaction quality index in subgrade filling engineering.