针对我国南海不同区域的海洋粘土,采用落锥试验研究了土体重塑不同时间后的触变恢复特性,分析了土体强度在含水率、塑性指数、灵敏度等多种因素影响下的恢复规律.研究表明:我国南海不同海域粘土均表现出明显的触变恢复特性,且这一特性受土体多种物理因素影响显著;要格外关注灵敏度较高的土体,避免因安装初期加载过度导致破坏;在含水率w=30.2%～43.8%、塑性指数Ip=10.2%～19.7%、液性指数IL=0.56～1.17、灵敏度St=4～7.9 这一区间内,土体恢复特性随含水率、塑性指数、液性指数和灵敏度的增大分别呈增大、增大、增大和减小的趋势;土体扰动 3 h,1、3、10、30、60 d 时,平均恢复到其原状土强度的 20.0%、22.4%、25.1%、28.6%、32.6%、35.9%.
Experimental Study on Recovery Characteristics of Thixotropic Strength of Typical Marine Clayey Soil
The thixotropic recovery characteristics of marine clay in different regions of the South China Sea after remolding at different times were studied using a falling cone test.The recovery law of soil strength under the influence of water content,plasticity index,sensitivity and other factors is analyzed.The results show that the clays in different areas of the South China Sea exhibit obvious thixotropic re-covery characteristics,which are significantly affected by various physical factors.Pay special attention to soil with high sensitivity to avoid damage caused by excessive loading during the initial installation pe-riod.In the range of water content w=30.2%-43.8%,plasticity index Ip=10.2%-19.7%,liquid in-dex IL=0.56-1.17,and sensitivity St=4-7.9,the soil recovery characteristics increase,increase,and decrease with the increase of water content,plasticity index,liquid index,and sensitivity,respec-tively.When the soil mass is disturbed for 3 hours,1 day,3 days,10 days,30 days,and 60 days,it recovers to 20.0%,22.4%,25.1%,28.6%,32.6%,and 35.9% of the original soil strength on ave-rage.
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