百色膨胀土用作路堤填料的试验验证

基于膨胀土可以直接用作路堤填料的分类指标体系，在室内开展了3种不同膨胀土的物理性质、击实性状、强度特性试验研究，验证广西百隆高速公路膨胀土路段的膨胀土也可以直接用作路堤填料，并结合现场实体工程的效果验证用改进CBR值、改进CBR膨胀量和稠度3指标作为膨胀土路堤填料的分类指标体系的合理性。通过对标准CBR试验和改进CBR试验的对比，进一步验证了用改进CBR试验法评定膨胀土承载强度的合理性。由百色膨胀土的不浸水CBR试验，说明可以用封闭包盖对百隆路膨胀土路堤进行物理处治。实体工程中采用土性最差的1号膨胀土做填芯和用红黏土包边，得到的工程效果令人满意。由室内外试验结果，可以得出这3种百色膨胀土都可以直接用作路堤填料。

Test verification of Baise expansive soils used as embankment fillings

Based on the classification scheme of expansive soils which can be used as embankment fillings, an experimental research on physical properties, compaction behaviors and strength characteristics for three different expansive soils to verify expansive soils in Baise-Longlin expressway of Guangxi Province can also be directly used as embankment fillings .Combining with the effect of entity engineering, the used CBR strength, the swelling rate of CBR sample in the modified CBR test and the consistency, which are used as classification scheme for embankment filling of expansive soils are verified to be reasonable. According to the comparison between the standard CBR test and the modified CBR test, the modified CBR test evaluating the CBR bearing strength of expansive soils is further verified to be reasonable. According to the unsoaking CBR test of Baise expansive soils, it shows covering and packing method in treating the expansive soil embankment in Baise-Longlin expressway is feasible. The entity engineering by using No.1 expansive soils whose behavior is the poorest as embankment fill and red clay as surrounding soil is satisfactory . From indoor and outdoor tests results, the three Baise expansive soils can be directly used as embankment fill are drawn.