干湿循环条件下泥岩路基填料路用性能的试验研究

Experimental Study on Pavement Performance of Mudstone Subgrade Filling under Dry-wet Cycle

依托某高速公路一标段泥岩公路路基填料开展常规土工试验,针对干湿循环下泥岩路基填料路用性能试验的研究,对以往崩解性试验的两次干湿循环改进为n次循环下崩解度试验,进行多次干湿循环下的耐崩解性试验、CBR试验、强度试验、压缩试验,并进行影响因素及发展规律分析。结果表明:n次干湿循环下耐崩解曲线随循环次数衰减至平缓,临界值崩解度指数约为40%;在同等条件下,泥岩填料CBR试验值随干湿循环交替次数增长而减小,且与荷载呈正比关系。

The pavement performance of mudstone subgrade filling under dry-wet cycle was studied in such manner that the disintegration was tested under not two dry-wet cycles formerly,but n cycles.For the subgrade filling in Section 1 of a mudstone highway,routine soil tests were carried out,including disintegration resistance test under multiple dry-wet cycles,CBR test,strength test and compression test;furthermore,the influencing factors and development rules thereof were analyzed.The results show that under n dry-wet cycles,the disintegration curve attenuates toward flat with the number of cycles,and the critical value of disintegration index is about 40%;under the same conditions,the value of CBR test for mudstone filling decreases with the increase of the number of dry-wet cycles,and is directly proportional to the load.