波浪荷载作用下非均等固结饱和粉土孔压特性研究
|
摘要
选用近海地区分布广泛的粉土作为研究对象,利用空心圆柱仪进行了模拟波浪荷载作用下的循环三轴-扭剪耦合试验,探寻非均等固结条件下饱和粉土孔隙水压力的发展特性。试验结果表明:非均等固结条件下,饱和粉土孔压比与广义剪应变之间的关系符合双曲线发展形式,孔压比与振次比之间的关系可以用幂函数来较好地拟合。根据极限状态的摩尔—库仑定律,推导了少粘性粉土孔隙水压力极限值计算方法,并将计算值与试验值进行了比较。孔压比和固结比的计算值与试验值之间均符合直线型关系,且固结比越小,计算值与试验值之间的差异越小。
Cyclic triaxial-torsional coupling shear tests were performed by hollow cylinder apparatus under anisotropic consolidation to study the development of pore water pressure in the saturated silt under wave loading.It was found that the relationship between pore water pressure ratio and generalized shear strain of saturated silts under anisotropic consolidation well fits the hyperbolic curve,while pore pressure ratio and vibration cycle ratio can be fitted by the use of power function.According to the Mohr-Coulomb law under ultimate state,the method to calculate limit pore water pressure of less viscous silt was proposed;Comparison between the calculation results and the test results showed that there is a linear relationship between pore pressure ratio and consolidation ratio for both of the calculation results and the test values.In addition,the smaller the Kc is,the less difference exists between calculation results and test values.
Cyclic triaxial-torsional coupling shear tests were performed by hollow cylinder apparatus under anisotropic consolidation to study the development of pore water pressure in the saturated silt under wave loading.It was found that the relationship between pore water pressure ratio and generalized shear strain of saturated silts under anisotropic consolidation well fits the hyperbolic curve,while pore pressure ratio and vibration cycle ratio can be fitted by the use of power function.According to the Mohr-Coulomb law under ultimate state,the method to calculate limit pore water pressure of less viscous silt was proposed;Comparison between the calculation results and the test results showed that there is a linear relationship between pore pressure ratio and consolidation ratio for both of the calculation results and the test values.In addition,the smaller the Kc is,the less difference exists between calculation results and test values.
引文
[1]曹宇春,王天龙.上海粉土液化特性及孔压模型的试验研究[J].上海地质,1998,67(3):60-64.Cao Y Ch,Wang T L.Experimental study on lique-faction behavior and pore pressure model of silt inShanghai[J].Shanghai Geology,1998,67(3):60-64.
[2]于濂洪,王波.饱和粉土振动孔隙水压力的试验研究[J].大连大学学报,1999,20(4):60-62.Yu L H,Wang B.Study on pore water pressure ofsaturated and disturbed sandy loam during cyclic load-ing[J].Journal of Dalian University,1999,20(4):60-62.
[3]冯秀丽,叶银灿,马艳霞,等.动荷载作用下海底粉土的孔压响应及其动强度[J].青岛海洋大学学报,2002,32(3):426-433.Feng X L,Ye Y C,Ma Y X,et al.Silt pore pressureresponse and dynamic strength under dynamic loading[J].Journal of Ocean University of Qingdao,2002,32(3):429-433.
[4]陈国兴,刘雪珠.南京及邻近地区新近沉积土的动剪切模量和阻尼比的试验研究[J].岩石力学与工程学报,2004,23(8):1403-1410.Chen G X,Liu X Zh.Testing study on ratio of dy-namic shear moduli and ratio of damping for recentlydeposited soils in Nanjing and its neighboring areas[J].Chinese Journal of Rock Mechanics and Engineer-ing,2004,23(8):1403-1410.
[5]郭莹,栾茂田,何杨,等.复杂应力条件下饱和松砂孔隙水压力增长特性的试验研究[J].地震工程与工程振动,2004,24(3):139-144.Guo Y,Luan M T,He Y,et al.Experimental studyon development pattern of shaking-induced pore waterpressure of saturated loose sand under complex loading[J].Earthquake Engineering and Engineering Vibra-tion,2004,24(3):139-144.
[6]郭莹,栾茂田,何杨,等.主应力方向循环变化对饱和松砂不排水动力特性的影响[J].岩土工程学报,2005,27(4):403-409.Guo Y,Luan M T,He Y,et al.Effect of variation ofprincipal stress orientation during cyclic loading on un-drained dynamic behavior of saturated loose sands[J].Chinese Journal of Geotechnical Engineering,2005,27(4):403-409.
[7]曾长女,刘汉龙,丰土根,等.饱和粉土孔隙水压力性状试验研究[J].岩土力学,2005,26(12):1963-1966.Zeng Ch N,Liu H L,Feng T G,et al.Test study onpore water pressure mode of saturated silt[J].Rockand Soil Mechanics,2005,26(12):1963-1966.
[8]赵宇.不同动应力路径下粉土动力特性试验研究[D].杭州:浙江大学,2007.Zhao Y.Silt response to different cyclic stress path[D].Hangzhou:Zhejiang University,2007.
[9]Lo K Y.The pore pressure-strain relationship of nor-mally consolidated undisturbed clays:part I.theoreti-cal considerations[J].Canadian Geotechnical Journal,1969,6(4):383-394.
[10]Seed H B,Lysmer J,Martin P P.Pore-water pressurechanges during soil liquefaction[J].Journal ofGeotechnical Engineering Division,ASCE,1976,102(5):323-345.
[11]Chang C S,Kuo C L,Selig E T.Pore pressure deve-lopment during cyclic loading[J].Journal of Geotech-nical Engineering Division,ASCE,1983,109(1):103-107.
[2]于濂洪,王波.饱和粉土振动孔隙水压力的试验研究[J].大连大学学报,1999,20(4):60-62.Yu L H,Wang B.Study on pore water pressure ofsaturated and disturbed sandy loam during cyclic load-ing[J].Journal of Dalian University,1999,20(4):60-62.
[3]冯秀丽,叶银灿,马艳霞,等.动荷载作用下海底粉土的孔压响应及其动强度[J].青岛海洋大学学报,2002,32(3):426-433.Feng X L,Ye Y C,Ma Y X,et al.Silt pore pressureresponse and dynamic strength under dynamic loading[J].Journal of Ocean University of Qingdao,2002,32(3):429-433.
[4]陈国兴,刘雪珠.南京及邻近地区新近沉积土的动剪切模量和阻尼比的试验研究[J].岩石力学与工程学报,2004,23(8):1403-1410.Chen G X,Liu X Zh.Testing study on ratio of dy-namic shear moduli and ratio of damping for recentlydeposited soils in Nanjing and its neighboring areas[J].Chinese Journal of Rock Mechanics and Engineer-ing,2004,23(8):1403-1410.
[5]郭莹,栾茂田,何杨,等.复杂应力条件下饱和松砂孔隙水压力增长特性的试验研究[J].地震工程与工程振动,2004,24(3):139-144.Guo Y,Luan M T,He Y,et al.Experimental studyon development pattern of shaking-induced pore waterpressure of saturated loose sand under complex loading[J].Earthquake Engineering and Engineering Vibra-tion,2004,24(3):139-144.
[6]郭莹,栾茂田,何杨,等.主应力方向循环变化对饱和松砂不排水动力特性的影响[J].岩土工程学报,2005,27(4):403-409.Guo Y,Luan M T,He Y,et al.Effect of variation ofprincipal stress orientation during cyclic loading on un-drained dynamic behavior of saturated loose sands[J].Chinese Journal of Geotechnical Engineering,2005,27(4):403-409.
[7]曾长女,刘汉龙,丰土根,等.饱和粉土孔隙水压力性状试验研究[J].岩土力学,2005,26(12):1963-1966.Zeng Ch N,Liu H L,Feng T G,et al.Test study onpore water pressure mode of saturated silt[J].Rockand Soil Mechanics,2005,26(12):1963-1966.
[8]赵宇.不同动应力路径下粉土动力特性试验研究[D].杭州:浙江大学,2007.Zhao Y.Silt response to different cyclic stress path[D].Hangzhou:Zhejiang University,2007.
[9]Lo K Y.The pore pressure-strain relationship of nor-mally consolidated undisturbed clays:part I.theoreti-cal considerations[J].Canadian Geotechnical Journal,1969,6(4):383-394.
[10]Seed H B,Lysmer J,Martin P P.Pore-water pressurechanges during soil liquefaction[J].Journal ofGeotechnical Engineering Division,ASCE,1976,102(5):323-345.
[11]Chang C S,Kuo C L,Selig E T.Pore pressure deve-lopment during cyclic loading[J].Journal of Geotech-nical Engineering Division,ASCE,1983,109(1):103-107.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心