黔中喀斯特地区土力学特性对土壤侵蚀的影响

Effects of Soil Mechanical Properties on Soil Erosion in Karst Area of Guizhou Center

在黔中喀斯特地区通过野外调查及室内试验的方法研究了土壤黏聚力c、内摩擦角φ、土壤紧实度对土壤冲刷模数和崩解速率的影响。结果表明:土壤冲刷模数随土壤黏聚力c、内摩擦角φ、土壤紧实度的增大而减小;土壤崩解速率随土壤黏聚力c、土壤紧实度的增大而减小;土壤崩解速率随土壤内摩擦角φ的增大而先增大后减小,在16°～20°之间存在一个峰值。相关性分析表明,土壤紧实度与土壤冲刷模数及崩解速率关系最为密切,土壤紧实度对土壤侵蚀的影响也最为明显,适度增强紧实度有助于提升土壤抗冲性及抗蚀性。

By means of fields investigation and lab experiments,we researched soil mechanical properties correlation with soil scouring modulus and slaking rate in karst area of Guizhou center,soil mechanical properties include soil cohesion c,soil internal friction angle φ and soil compaction.The results revealed that soil scouring modulus reduces along with increasing of soil cohesion c,soil internal friction angle φ and soil compaction;Soil slaking rate reduces along with increasing of soil cohesion c and soil compaction;With the increase of soil internal friction angle φ,the soil slaking rate will increase and then decrease,there existed maximum between 16° and 20°.Correlation analysis results showed that soil compaction has a close relation with soil scouring modulus and slaking rate,the impact of soil erosion by soil compaction most obvious.Moderate enhances soil compaction may raise soil anti-scouribility and anti-erodibility.