南黄海辐射沙脊群粉质砂土液化后大变形特性试验研究
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摘要
采用英国GDS动力三轴试验系统,针对南黄海辐射沙脊群粉质砂土,进行了不同相对密度、不同加载频率及不同固结比条件下的循环三轴试验,并在试样达到液化控制标准后进行固结不排水单调剪切试验,进一步探讨粉质砂土液化后大变形特性。结果表明:试样在动力三轴试验过程中达到液化控制标准并固结排水后,在整个单调剪切过程中,一直呈现出应变硬化的特性,产生很小的正孔隙水压力后,孔隙水压力向负的方向发展,试样始终处于剪胀状态,并最终达到稳定。
Using the GDS dynamic triaxial test system,the cyclic triaxial shear tests were performed on the silty sand under different relative density,loading frequency and consolidation ratio.Samples that had achieved liquefied control standard received a consolidation undrained monotonic shearing test so as to get a further discussion on the silty sand liquefaction deformation characteristics.The test result shows that in the process of undrained monotonic shearing test,samples had always presented the characteristics of strain hardening.The pore water pressure went into the negative direction after the small positive pore water pressure.The samples kept the state of dilatancy and achieved ultimate stability.
Using the GDS dynamic triaxial test system,the cyclic triaxial shear tests were performed on the silty sand under different relative density,loading frequency and consolidation ratio.Samples that had achieved liquefied control standard received a consolidation undrained monotonic shearing test so as to get a further discussion on the silty sand liquefaction deformation characteristics.The test result shows that in the process of undrained monotonic shearing test,samples had always presented the characteristics of strain hardening.The pore water pressure went into the negative direction after the small positive pore water pressure.The samples kept the state of dilatancy and achieved ultimate stability.
引文
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[2]HAMADA M,TOWHATA I,YASUDA S,et al.Study on permanent ground displacement induced by seismic liquefaction[J].Computers and Geotechnics,1987,4(4):197-220.
[3]张建民,时松孝次,田屋裕司.饱和砂土液化后的剪切吸水效应[J].岩土工程学报,1999,21(4):398-402.
[4]鲁晓兵.饱和砂土液化引起的变形研究[J].中国造船,2002(1):345-348.
[5]刘汉龙,周云东,高玉峰.砂土地震液化后大变形特性试验研究[J].岩土工程学报,2002,24(2):142-146.
[6]周云东,刘汉龙,高玉峰,等.砂土地震液化后大位移室内试验研究探讨[J].地震工程与工程振动,2002,22(1):152-157.
[7]张建民,王刚.砂土液化后大变形的机理[J].岩土工程学报,2006,28(7):835-840.
[8]刘汉龙,陈育民.动扭剪试验中砂土液化后流动特性分析[J].岩土力学,2009(6):1537-1541.
[9]陈育民,刘汉龙,邵国建,等.砂土液化及液化后流动特性试验研究[J].岩土工程学报,2009,31(9):1408-1413.
[10]张振东.江苏近海辐射沙脊群人工岛建设工程问题初探[J].淮海工学院学报:自然科学版,2010,19(3):89-92.
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