基于不同数据处理方法的击实特性求解及应用

Solution and Application of Compaction Characteristic Based on Different Data Processing Methods

结合土工击实试验相关规程,以江苏某省道改扩建工程路基土随机取样试验数据为依托,对两种击实最佳指标求解方法进行对比分析,应用二次曲线拟合法对不同灰剂量、不同制备方法和不同击实方式混合料击实指标进行求解。结果表明:路基土的最佳击实指标求解宜采用三点二次插值法或二次曲线拟合法,曲线拟合次数不宜过高,否则容易导致最大干密度虚假偏大,压实度偏小,影响道路压实效果;改变土样的石灰剂量,由0增大至8%,最优含水率呈二次曲线递减,最大干密度呈三次曲线递增;击实土重复利用所测最大干密度比原状土大,最优含水率比原状土小;与轻型击实相比,重型击实的最大干密度要大得多,而最佳含水率要小得多。

This paper combined with the practice of geotechnical testing regulations, based on a Jiangsu highway expansion project of subgrade soil random sampling test data, it compared and analyzed the two kinds of solving methods of compaction, and used the quadratic fitting curves method to solve compaction index of mixture with different lime content, preparation and compaction methods. Results show that： it＇ s suggested to use the three point two interpolation method or the two curve fitting method to solve the best compaction index of subgrade soil indicators. In order to ensure the reasonable compaction effect and avoid the maximum dry density being false partial large or the compaction degree being false partial small, the n-power of curve fitting should not be too high ; When the lime content increased from 0 to 8%, the optimal water content was decreased in a trend of quadratic curve, the maximum dry density was increased in a trend of cubic curves; compared to the undisturbed soil, the maximum dry density of compacted soil is relatively larger, while the optimum moisture content is smaller; compared with light hammer, the maximum dry density of heavy compaction is much larger, while the optimum moisture content is much smaller.