近代黄河水下三角洲底坡土体的差异侵蚀及土工特性

近代黄河水下三角洲海底声波探测资料和土工资料揭示 :波浪、潮流在所研究区域海底沉积物中产生的差异侵蚀和不同的破坏行为受沉积物土工特性的控制。研究表明 ,粘粒含量低于10 % ,含水量在 30 %～ 4 5% ,孔隙比在 0 .8～ 1.2之间的土体抵抗破坏的能力较差 ,土体破坏形成塌陷凹坑 ;粘粒含量在 10 %～ 2 0 % ,含水量在 2 0 %～ 30 % ,孔隙比小于 0 .8的土体抵抗破坏的能力相对较强 ,被保留下来形成蚀余高地

The Differential Erosion and Geotechnical Properties of the Slope Soil on the Modern Huanghe Subaquous Delta

After analysing the acoustic data and the difference blocks' geotechnical data of the modern Huanghe estuary, we find that the differential erosion and failure behvior of soil in the slope are controlled by sedimental geotechnical properties: The counter failure ability of soil with a low clay content(<10%), high water content(30%~45%) and large void ratio(0.8~1.2) is weaker; the soil breakage will form collapse; The soil which has a high clay content (>20%), high water content(>45%) and large void ratio(>1.2) can slide and form surface disturbance bodies; and the soil which has a middle clay content(<20%), middle water content(20%~30%) and small porosity ratio(<0.8) has stronger counter failure abilities and can be preserved to form monadnocks. Geotechnical properties will be changed after breakage, the water content and porosity ratio will decrease, the wet density and strength will increase, and the abilities of counter breakage will strengthen, hence the slope stability will enhance.