路基弯沉检测标准

Test standard of subgrade deflection

针对《公路路面基层施工技术规范》（JTJ034-2000）中路基弯沉检测方法存在的不足，结合西安—户县高速公路试验路实体工程，对土样进行室内轻、重型击实标准回弹模量试验，现场检测土基回弹弯沉值、回弹模量和压实度等指标。对检测数据进行回归分析，得出土基回弹模量与稠度、压实度的关系，进而推出季节影响系数与稠度关系。结果表明：西安地区土基回弹模量设计取值宜在规范基础上提高20％～40％；结合回归得出的土基回弹模量与土基顶面弯沉的关系，可以得到路基顶面弯沉检测标准，从而为路基弯沉检测提供依据。

There exist shortcomings in the subgrade deflection test method in Chinese technology standard Specification of Highway Subgrade Construction. In order to get the reasonable test standard, on the experimental road from Xi＇an to Huxian, the indoor modulus tests of the soil samples under the light compaction and heavy compaction standards were carried, and the field subgrade deflection, modulus and compaction degree were tested. The relationship between subgrade rebound modulus and consistency and compaction degree with the regression analysis of the test datum and the relationship between the season influencing coefficients and the consistency were drawn. The results show that the design values of the subgrade rebound modulus at Xi＇an region should be increased 20%-40% at the basis of the specification ones, the test standard of subgrade top deflection can be derived combining the regression relationship between the subgrade rebound modulus and the suhgrade top deflection, which can provide reasonable standard for subgrade deflection test. 6 tabs, 1 fig, 12 refs.