高速公路弃土场边坡沟蚀规律研究——以湖北沪蓉西高速公路为例

Law of gully erosion of side slope of expressway spoil ground:A case study in constructing Hurongxi Expressway of Hubei Province

为探讨公路弃土场边坡沟蚀发生发展规律,以湖北沪蓉西高速公路(宜长段)为例,从弃土场沟蚀发育特征、发生发展规律和与沟间侵蚀的关系3方面对弃土场沟蚀规律进行探讨。结果表明,弃土场边坡沟蚀与降雨有密切的关系,沟蚀在坡面土壤侵蚀量占的比重越来越大;弃土场坡面沟蚀发展呈加剧发展趋势,随着观测时间的变化,细沟侵蚀在整个坡面土壤侵蚀量中占的比重越来越小,而相对浅沟侵蚀和切沟侵蚀所占的比重越来越大。

In order to made a study of law of development of side slope gully erosion of highway spoil ground, upgrowth characteristic and law of development of gully erosion and realation between intercolparis erosion and gully erosion had been studied in the spoil ground of constructing Hurongxi expressway of Hubei province. The result indicated that gully erosion of spoil ground side slope had an intimate relation with rainfall and gully erosion had occupied increasing proportion in the whole of soil erosion quantity in side slope;development trend of ramp gully erosion of spoil ground was aggravated; with the change of observation time , the amount of rill erosion had occupied dicreasing proportion in the whole ramp soil erosion quantity, whereas relatively bunker erosion and kuff erosion had occupied increasingly proportion in company with time variance.