土工标准击实试验数据的简化拟合模型及分析

Simplified Fitting Models and Analysis of Soil Compaction Test

用标准重型击实试验的方法,取得各种土样的击实数据,采用4次多项式数学模型拟合土样5种不同含水量与干密度之间的关系,并进一步将模型简化为3种试验数据的2次多项式模型,以此确定最佳含水量xm和最大干密度ρm.运用上述模型计算了55组粗粒土、细粒土等土样的重型击实试验数据,并与目前工程中普遍使用的人工作图法进行比较.结果表明,模型有较高的精度,其中根据2次多项式简化模型确定的xm和ρm不但精度较高,而且可减少约40%的试验工作量,具有较好的工程实用性.

Compaction data of various soil samples were obtained by standard compaction test. The paper fitted the relations between five various water contents and dry density by artificial mapping and 4th order polynomial, based on that the data was simplified to second-order polynomial model fitting of three kinds of test data, and so the optimum water content xm and maximum dry density ρm was determined. Fifty-five groups test data of coarse-grained soil, fine soil and special soil were computed by the model. And the computation results from the simplified model have good precision compared with the mapping method, which may obtain different results because of the human factor, so that 40% of test workload can be reduced, which is obviously useful.