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高液限土是我国南方公路建设中经常遇到的一类特殊土。规范规定的CBR试验是在土的最佳含水率时分别采用30、50、98击击实后进行CBR试验。针对福建泉三高速公路高液限土天然含水率高的现状,为与实际施工状况相一致,调整了CBR试验的击实次数与含水率,通过对试验结果的分析,揭示了高液限土的密实度(压实度)曲线与CBR强度曲线呈分离的双驼峰曲线的现象,分析了密实度(压实度)曲线与CBR强度曲线分离的成因机理;提出了高液限土的最大CBR强度与最大CBR含水率的概念,确定了高液限土最大CBR强度与最大CBR含水率的试验方法。
High-liquidity soil is a kind of special soil often encountered in highway construction in South China. CBR test specification is the best soil moisture content of 30,50,98 hits were CBR test hit. In view of the fact that the natural high water content of high liquid limit soil in Quanzhou-Sanzhou Expressway is high, in order to be consistent with the actual construction condition, the compaction times and water cut of CBR test were adjusted. By analyzing the test results, The compaction degree (compaction degree) curve and the CBR intensity curve were separated double hump curve phenomenon, the compaction mechanism (compaction degree) curve and CBR intensity curve separation mechanism; proposed high liquid limit soil maximum CBR Strength and maximum CBR moisture content to determine the maximum CBR high liquid limit soil strength and maximum CBR moisture content of the test method.