第33卷第6期 2016年11月
土木工程与管理学报 Journal of Civil Engineering and Management
Vol. 33 No.6 Nov.2016
基于不同数据处理方法的击实特性求解及应用
赵敏，厉广广，尹文静
（西安工业大学建筑工程学院，陕西西安710032）
摘要：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。关键词：击实曲线；拟合；最大干密度；数据插值；最优含水率
中图分类号：U416
文章编号：2095-0985（2016)06-0022-04
文献标识码：A
Solution and Application of Compaction Characteristic Based on
DifferentDataProcessingMethods ZHAO Min, LI Guang-guang, YIN Wen-jing
( School of Civil and Architecture Engineering,Xi' an Technological University, Xi' an 710032, China) Abstract: 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 O 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.
Key words: compaction curve; fitting; maximum dry density; data interpolation; optimum moisture
content
压实度是保证路基强度和稳定性的直接因素之一，在外力作用下，路基压实土干密度增加从而改变其压实度]，工程中通常以室内标准击实试验曲线来确定土的最大干密度，以之作为衡量压
收稿日期：2016-03-31修回日期：2016-05-20
实性的重要指标。目前关于土的标准击实试验理论和计算方法已相对成熟，主要包括数解法（数据差值)和图解法（曲线拟合）两种。文献[2,3］对击实试验的试验方法进行介绍，并研究了最大
作者简介：赵敏(1970-），女，陕西杨凌人，教授，硕士，研究方向为岩土工程、隧道与城市地下工程、岩土工程测试理论与技术
万方数据zhaominxait@163.com）