重复利用土击实试验对比及其准确性探讨

土的最大干密度和最优含水率是土方工程中抗压、抗剪、抗渗等性能的关键性指标。基于泾阳地区的马兰黄土，通过室内标准击实试验，对土重复使用和不重复使用的击实曲线进行对比分析，并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，验证击实试验结果的可靠性。研究表明：泾阳地区马兰黄土的最大干密度为1.735gcm-3，最优含水率为17.07%；重复利用土的最大干密度为1.762gcm-3，最优含水率为16.69%，相对非重复利用土，最大干密度增大1.56%，最优含水量减小2.23%。利用插值函数得到的最优含水率与最大干密度与击实试验的结论基本一致，表明击实试验的准确性。三点二次插值法思路明确、计算简便，为求解最大干密度和最优含水量提供了理论依据，具有较高的适用性。

DISCUSSION ON COMPARISON AND ACCURACY OF REUSABLE SOIL COMPACTION TEST

The maximum dry density and optimal moisture content of soil are key indicators of compression, shear and penetration in earthwork. Based on the Malan loess in Jingyang area, compaction curves of reused soil and non-reused soil are contrasted and analyzed through the indoor standard compaction test, and the paper presents the method of using three-point two-time interpolation function to establish the functional relation between the maximum dry density and the optimum moisture content so as to indicate the reliability of the compaction test results. The research indicates that the optimum water content of Malan loess in Jingyang area is 17.07% and the maximum dry density is 1.735g cm-3. The optimum water content and the maximum dry density of reused soil are 1.762g cm-3 and 16.69%,respectively. Compared with non-reused soil, the maximum dry density increased by 1.56% and the optimal water content decreased by 2.23%.The conclusion obtained by using the three-point two-time interpolation function is basically consistent with the compaction test, which shows the accuracy of the compaction test. The method has the advantages of clear thinking and simple calculation, and has high applicability, which provides a theoretical basis for solving the maximum dry density and the optimal water content.