波浪作用下海底粉质土液化过程的速率特征
|
摘要
海底的粉质土在强烈波浪作用下会发生液化现象。粉质土从液化发生到最后形成流体有其变化的过程。本文针对黄河三角洲的粉质土,进行了波浪水槽试验和现场监测试验,记录了孔压在粉质土液化过程中的变化,给出了波浪作用下粉质土液化过程的速率特征。试验结果给出:海底粉质土在波浪作用下某一深度层的液化发展迅速,水槽试验重塑土用孔压增长速率反映的液化发展速率平均为0.15kPa/min,现场监测原状土液化发展速率平均为0.29kPa/min;水槽试验重塑土和现场监测原状土均出现液化深度自上而下的发展过程,本文水槽试验条件和现场条件给出的液化深度发展平均速率分别为0.01和0.10m/min。
Silty seabed will liquefy under strong waves.There is a specific process in which silty soil changes from initial liquefaction to final fluidsic form.In this paper,pore water pressure of Yellow River Subaqueous Delta was monitored,and flume experiment was carried out to obtain the pore water pressure data.The rate characteristics of wave induced silty soil liquefaction process were acquired.The results are given as follows:silty soil liquefaction of a certain depth layer developed rapidly under the wave loading.The average rate of liquefaction development was reflected as the growth rate of pore water pressure are 0.15 kPa/min in flume experiment and 0.29 kPa/min in field observation respectively.Both liquefaction in flume and in situ developed gradually from upper layer to lower one.In this paper,the average rate of liquefaction depth development in flume experiment and field observation are 0.01 and 0.10 m/min respectively.
Silty seabed will liquefy under strong waves.There is a specific process in which silty soil changes from initial liquefaction to final fluidsic form.In this paper,pore water pressure of Yellow River Subaqueous Delta was monitored,and flume experiment was carried out to obtain the pore water pressure data.The rate characteristics of wave induced silty soil liquefaction process were acquired.The results are given as follows:silty soil liquefaction of a certain depth layer developed rapidly under the wave loading.The average rate of liquefaction development was reflected as the growth rate of pore water pressure are 0.15 kPa/min in flume experiment and 0.29 kPa/min in field observation respectively.Both liquefaction in flume and in situ developed gradually from upper layer to lower one.In this paper,the average rate of liquefaction depth development in flume experiment and field observation are 0.01 and 0.10 m/min respectively.
引文
[1]Xu G,Sun Y,Wang X,et al.Wave-induced shallow slides and their features on the subaqueous Yellow River delta[J].Canadian Geotechnical Journal,2009,46(12):1406-1417.
[2]You Qi,Xu Guo-Hui,Wang Xiu-Hai,et al.Influence of soil liquefaction on the vertical mechanical behavior of submarine pipeline under the wave loading[J].Marine Science Bulletin,2015,17(1):11-25.
[3]Huang Zhe,Xu Guo-Hui,Meng Qing-Sheng,et al.Experimental study on the wave pressure of liquefied silty soil[J].Marine Science Bulletin,2016,18(1):29-42.
[4]Zen K,Yamazaki H.Mechanism of wave-induced liquefaction and densification in seabed[J].Soils Foundations,1990,30(4):90-104.
[5]Zen K,Yamazaki H.Field observation and analysis of wave-induced liquefaction in seabed.[J].Soils&Foundations-Tokyo-,1991,31(4):161-179.
[6]Sassa S,Takayama T,Mizutani M,et al.Field observations of the build-up and dissipation of residual pore pressures in seabed sands under the passage of storm waves[J].Journal of Coastal Research,2006,39(12):410-414.
[7]Chang W J,Rathje E M,Stokoe K H,et al.In situ pore-pressure generation behavior of liquefiable sand[J].Journal of Geotechnical&Geoenvironmental Engineering,2007,133(8):921-931.
[8]常方强,贾永刚.黄河口粉质土海床液化过程的现场试验研究[J].土木工程学报,2012(1):121-126.Chang F,Jia Y.In-situ test to study silt liquefaction at the subaqueous delta of Yellow River[J].China Civil Engineering Journal,2012,45(1):121-126.
[9]Yang G,Ye J.Nonlinear standing wave-induced liquefaction in loosely deposited seabed[J].Bulletin of Engineering Geology&the Environment,2017(9):1-19.
[10]Zhu B,Ren J,Ye G L.Wave-induced liquefaction of the seabed around a single pile considering pile–soil interaction[J].Marine Georesources&Geotechnology,2017,36(1):150-162.
[11]Sumer B M,Fredse J,Christensen S,et al.Sinking/floatation of pipelines and other objects in liquefied soil under waves[J].Coastal Engineering,1999,38(2):53-90.
[12]Teh T C,Palmer A C,Damgaard J S.Experimental study of marine pipelines on unstable and liquefied seabed[J].Coastal Engineering,2003,50(1-2):1-17.
[13]许国辉,单红仙,贾永刚.黄河水下三角洲沉积物在循环荷载作用下土体中孔压变化实验研究[J].青岛海洋大学学报(自然科学版),2003(1):80-86.Xu Guohui,Shan Hongxian,Jia Yonggang.Experimental research on the variation of pore-pressure under cyclic loading in the subaqueous Yellow River Delta[J].Journal of Ocean University of Qingdao,2003,33(1):80-86.
[14]Xu G,Liu Z,Sun Y,et al.Experimental characterization of storm liquefaction deposits sequences[J].Marine Geology,2016,382(1):191-199.
[2]You Qi,Xu Guo-Hui,Wang Xiu-Hai,et al.Influence of soil liquefaction on the vertical mechanical behavior of submarine pipeline under the wave loading[J].Marine Science Bulletin,2015,17(1):11-25.
[3]Huang Zhe,Xu Guo-Hui,Meng Qing-Sheng,et al.Experimental study on the wave pressure of liquefied silty soil[J].Marine Science Bulletin,2016,18(1):29-42.
[4]Zen K,Yamazaki H.Mechanism of wave-induced liquefaction and densification in seabed[J].Soils Foundations,1990,30(4):90-104.
[5]Zen K,Yamazaki H.Field observation and analysis of wave-induced liquefaction in seabed.[J].Soils&Foundations-Tokyo-,1991,31(4):161-179.
[6]Sassa S,Takayama T,Mizutani M,et al.Field observations of the build-up and dissipation of residual pore pressures in seabed sands under the passage of storm waves[J].Journal of Coastal Research,2006,39(12):410-414.
[7]Chang W J,Rathje E M,Stokoe K H,et al.In situ pore-pressure generation behavior of liquefiable sand[J].Journal of Geotechnical&Geoenvironmental Engineering,2007,133(8):921-931.
[8]常方强,贾永刚.黄河口粉质土海床液化过程的现场试验研究[J].土木工程学报,2012(1):121-126.Chang F,Jia Y.In-situ test to study silt liquefaction at the subaqueous delta of Yellow River[J].China Civil Engineering Journal,2012,45(1):121-126.
[9]Yang G,Ye J.Nonlinear standing wave-induced liquefaction in loosely deposited seabed[J].Bulletin of Engineering Geology&the Environment,2017(9):1-19.
[10]Zhu B,Ren J,Ye G L.Wave-induced liquefaction of the seabed around a single pile considering pile–soil interaction[J].Marine Georesources&Geotechnology,2017,36(1):150-162.
[11]Sumer B M,Fredse J,Christensen S,et al.Sinking/floatation of pipelines and other objects in liquefied soil under waves[J].Coastal Engineering,1999,38(2):53-90.
[12]Teh T C,Palmer A C,Damgaard J S.Experimental study of marine pipelines on unstable and liquefied seabed[J].Coastal Engineering,2003,50(1-2):1-17.
[13]许国辉,单红仙,贾永刚.黄河水下三角洲沉积物在循环荷载作用下土体中孔压变化实验研究[J].青岛海洋大学学报(自然科学版),2003(1):80-86.Xu Guohui,Shan Hongxian,Jia Yonggang.Experimental research on the variation of pore-pressure under cyclic loading in the subaqueous Yellow River Delta[J].Journal of Ocean University of Qingdao,2003,33(1):80-86.
[14]Xu G,Liu Z,Sun Y,et al.Experimental characterization of storm liquefaction deposits sequences[J].Marine Geology,2016,382(1):191-199.