高速公路路基岩溶探测与地基评价

本文讨论了地球物理方法在高速公路灰岩区探测溶洞方面的效果,并结合地表地质调查、适量的钻探以及土工试验成果对地基进行评价。文中以汝(城)郴(州)高速公路K22+600～K22+900段的岩溶探测为例,采用高密度电法、地质雷达法探测该段的隐伏溶洞分布,再利用钻探对物探成果进行抽样验证。由钻探成果可知,物探解释成果准确可靠,节省了勘察成本,避免了钻探方法以点代面的缺陷。同时,物探解译成果与其它勘查、土工试验结果相结合,可对路基病害进行综合评价,为路基病害处理提出了合理化建议。

Detecting karst caves under the subgrade of expressway and foundation evaluation

The exploration effect of geophysical methods to karst caves is discussed, and the evaluation of foundation is also carried out by using the results of geophysical method, the geological detection on the ground surface, the drilling and the soil tests. Taking the exploration of karst caves in section K22 ＋ 600 - K22 ＋900 of Rucheng-Chenzhou expressway as an example, the high-density resistivity method and the ground penetrating radar to survey the concealed karst caves are adopted, and the exploration results have been validated by the drilling. According to the drilling results, the geophysical inversion results are exact. The cost for the investigation with geophysical methods is low, and the shortage of the drilling with one point result to substitute that in an area can be avoided. At the same time, subgrade diseases can be evaluated synthetically by using integrating geophysical inversion results with other results such as from geological detection and soil tests, from which some reasonable advices for subgrade treatment are put forward.