饱和海床土渗流-应力耦合损伤及液化破坏规律(Ⅱ)
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摘要
在文章规律(Ⅰ)基础上,进一步分析了海床软弱结构面断裂损伤对液化贯通带形成的影响,建立了海床土体在损伤及孔隙水压联合作用下的Mohr-Columb破坏准则。并在微元体强度服从Weibull分布前提下,通过将损伤因子与液化带贯通临界概率相结合,揭示了液化突变的必然性和可确定性。提出了土体临界液化孔压比uw/uf概念,进而引入uw/uf对液化规律进行分析,找到了不同土质海床的临界液化判别准则及其影响因素,准则对海洋工程地质灾害预测预报具有一定的指导意义。
On the basis of the published paper( I),the impact of the seabed soil structure surface rupture on the formation of the liquefied rupture band was further analyzed and a Mohr-Columb failure criterion of seabed soil under the combined effects of the micro-damage and pore water pressure was established. Under Weibull distribution conditions of micro-element strength,the inevitability and certainty characteristics of liquefied mutation were revealed through combination of the damage factor and the liquefied critical probability of the liquefied rupture band.The concept of critical pore pressure ratio uw/ ufof soil liquefaction was put forward. Using this method,the judgment standards for critical liquefaction of different seabed soil and its influencing factors were found. The criterion law has a great significance for the forecast of marine engineering geological disasters.
On the basis of the published paper( I),the impact of the seabed soil structure surface rupture on the formation of the liquefied rupture band was further analyzed and a Mohr-Columb failure criterion of seabed soil under the combined effects of the micro-damage and pore water pressure was established. Under Weibull distribution conditions of micro-element strength,the inevitability and certainty characteristics of liquefied mutation were revealed through combination of the damage factor and the liquefied critical probability of the liquefied rupture band.The concept of critical pore pressure ratio uw/ ufof soil liquefaction was put forward. Using this method,the judgment standards for critical liquefaction of different seabed soil and its influencing factors were found. The criterion law has a great significance for the forecast of marine engineering geological disasters.
引文
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[12]秦四清,徐锡伟,胡平,等.孕震断层的多锁固段脆性破裂机制与地震预测新方法的探索[J].地球物理学报,2010,53(4):1001-1013.QIN Siqing,XU Xiwei,HU Ping,et al.Brittle failure mechanism of multiple locked patches in a seismogenic fault system and exploration on a new way for earthquake prediction[J].Chinese Journal of Geophysics,2010,53(4):1001-1013.
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[14]王艳丽,王勇.饱和砂的动孔压演化特性试验研究[J].同济大学学报:自然科学版,2009,37(12):1603-1607.WANG Yanli,WANG Yong.Experimental study on evolutionary characteristics of dynamic pore water pressure of saturated sands[J].Journal of Tongji University:Natural Science Edition,2009,37(12):1603-1607.
[15]张健,高玉峰,沈扬,等.波浪荷载作用下饱和粉土反正弦孔压拟合参数影响因素分析[J].岩土力学,2011,32(3):727-732.ZHANG Jian,GAO Yufeng,SHEN Yang,et al.Factor analysis of fitting parameter for saturated silt arcsin pore water pressure under wave loading[J].Journal of Rock and Soil Mechanics,2011,32(3):727-732.
[16]张茹,何昌荣,费文平,等.饱和黏性土和砂砾石料振动孔压的试验研究[J].岩土力学,2006,27(10):1805-1810.ZHANG Ru,HE Changrong,FEI Wenping,et al.Experimental study on dynamic pore water pressure of saturated cohesive soil and gravel[J].Journal of Rock and Soil Mechanics,2006,27(10):1805-1810.
[17]王军,蔡袁强,郭林,等.分阶段循环加载条件下温州饱和软黏土孔压和应变发展规律[J].岩土工程学报,2012,34(7):1349-1354.WANG Jun,CAI Yuanqiang,GUO Lin,et al.Pore pressure and strain development of Wenzhou saturated soft soil under cyclic loading by stages[J].Journal of Geotechnical Engineering,2012,34(7):1349-1354.
[18]王艳丽,饶锡保,潘家军,等.细粒含量对饱和砂土动孔压演化特性的影响[J].土木建筑与环境工程,2011,33(3):52-56.WANG Yanli,RAO Xibao,PAN Jiajun,et al.Effects of fines content on evolutionary characteristics of dynamic pore water pressure of saturated sands[J].Journal of Civil,Architectural and Environmental Engineering,2011,33(3):52-56.
[19]陈国兴,王炳辉.局部排水条件下南京细砂振动孔压的波动特性[J].岩土工程学报,2010,32(5):767-773.CHEN Guoxing,WANG Binghui.Fluctuating characteristics of excess pore water pressure in Nanjing fine sand under partially drained conditions[J].Journal of Geotechnical Engineering,2010,32(5):767-773.
[2]沈珠江,陈铁林.岩土破损力学——结构类型与荷载分担[J].岩石力学与工程学报,2004,23(13):2137-2142.SHEN Zhujiang,CHEN Tielin.Breakage mechanics of geomaterial-structure types and load sharing[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(13):2137-2142.
[3]DUNLAP W,BRYANT W R,WILLIAMS G N,et al.Storm wave effects on deltaic sediments—results of EASWAB I and II[C]//Port and Ocean Engineering Under Arctic Conditions(POAC79).Trondheim,Norway,1979:899-920.
[4]MIYAMOTO T,YOSHINAGA S,SOGA F,et al.Seismic prospecting method applied to the detection of offshore breakwater units setting in the seabed[J].Coastal Engineering in Japan,1989,32:103-112.
[5]郑维民.中国海洋工程地质研究[J].工程地质学报,1994,2(1):90-96.ZHENG Weimin.Marine engineering geology research in China[J].Journal of Engineering Geology,1994,2(1):90-96.
[6]单红仙,贾永刚,许国辉.波浪作用诱发的黄河口水下斜坡失稳破坏[J].地学前缘,2001,8(3):130.SHAN Hongxian,JIA Yonggang,XU Guohui.Wave action caused the Yellow River mouth slope instability and failure[J].Earth Science Frontiers,2001,8(3):130.
[7]CHRISTIAN J T,TAYLOR P K,YEN J K C,et al.Large diameter under water pipeline for nuclear power plant designed against soil liquefaction[C]//Proceedings of the Sixth Annual Offshore Technology Conference.Houston,USA,1974:597-606.
[8]刘红军,李洪江,王虎,等.饱和海床土渗流-应力耦合损伤及液化破坏规律(Ⅰ)[J].哈尔滨工程大学学报,2014,35(11):1320-1326.LIU Hongjun,LI Hongjiang,WANG Hu,et al.Study on seepage-stress coupling damage and liquefaction failure regularity of saturated seabed soil(Ⅰ)[J].Journal of Harbin Engineering University,2014,35(11):1320-1326.
[9]汪闻韶.土体液化与极限平衡和破坏的区别和关系[J].岩土工程学报,2005,27(1):1-10.WANG Wenshao.Distinction and interrelation between liquefaction,state of limit equilibrium and failure of soil mass[J].Journal of Geotechnical Engineering,2005,27(1):1-10.
[10]陈友媛,刘红军,贾永刚,等.循环荷载作用下海床结构粉质土的液化渗流机理定性研究[J].岩土力学,2007,28(8):1632-1635.CHEN Youyuan,LIU Hongjun,JIA Yonggang,et al.Qualitative study on mechanism of liquefaction and seepage of seabed structure silty soil under cyclic loads[J].Journal of Rock and Soil Mechanics,2007,28(8):1632-1635.
[11]张浪平,尹祥础,梁乃刚.加卸载响应比与损伤变量关系研究[J].岩石力学与工程学报,2008,27(9):1874-1881.ZHANG Langping,YIN Xiangchu,LIANG Naigang.Study on relation between load/unload response radio and damage variable[J].Journal of Rock Mechanics and Engineering,2008,27(9):1874-1881.
[12]秦四清,徐锡伟,胡平,等.孕震断层的多锁固段脆性破裂机制与地震预测新方法的探索[J].地球物理学报,2010,53(4):1001-1013.QIN Siqing,XU Xiwei,HU Ping,et al.Brittle failure mechanism of multiple locked patches in a seismogenic fault system and exploration on a new way for earthquake prediction[J].Chinese Journal of Geophysics,2010,53(4):1001-1013.
[13]刘红军,王小花,贾永刚,等.黄河三角洲饱和粉土液化特性及孔压模型试验研究[J].岩土力学,2005,26(S2):83-87.LIU Hongjun,WANG Xiaohua,JIA Yonggang,et al.Experimental study on liquefaction properties and pore-water pressure model of saturated silt in Yellow River Delt[J].Journal of Rock and Soil Mechanics,2005,26(S2):83-87.
[14]王艳丽,王勇.饱和砂的动孔压演化特性试验研究[J].同济大学学报:自然科学版,2009,37(12):1603-1607.WANG Yanli,WANG Yong.Experimental study on evolutionary characteristics of dynamic pore water pressure of saturated sands[J].Journal of Tongji University:Natural Science Edition,2009,37(12):1603-1607.
[15]张健,高玉峰,沈扬,等.波浪荷载作用下饱和粉土反正弦孔压拟合参数影响因素分析[J].岩土力学,2011,32(3):727-732.ZHANG Jian,GAO Yufeng,SHEN Yang,et al.Factor analysis of fitting parameter for saturated silt arcsin pore water pressure under wave loading[J].Journal of Rock and Soil Mechanics,2011,32(3):727-732.
[16]张茹,何昌荣,费文平,等.饱和黏性土和砂砾石料振动孔压的试验研究[J].岩土力学,2006,27(10):1805-1810.ZHANG Ru,HE Changrong,FEI Wenping,et al.Experimental study on dynamic pore water pressure of saturated cohesive soil and gravel[J].Journal of Rock and Soil Mechanics,2006,27(10):1805-1810.
[17]王军,蔡袁强,郭林,等.分阶段循环加载条件下温州饱和软黏土孔压和应变发展规律[J].岩土工程学报,2012,34(7):1349-1354.WANG Jun,CAI Yuanqiang,GUO Lin,et al.Pore pressure and strain development of Wenzhou saturated soft soil under cyclic loading by stages[J].Journal of Geotechnical Engineering,2012,34(7):1349-1354.
[18]王艳丽,饶锡保,潘家军,等.细粒含量对饱和砂土动孔压演化特性的影响[J].土木建筑与环境工程,2011,33(3):52-56.WANG Yanli,RAO Xibao,PAN Jiajun,et al.Effects of fines content on evolutionary characteristics of dynamic pore water pressure of saturated sands[J].Journal of Civil,Architectural and Environmental Engineering,2011,33(3):52-56.
[19]陈国兴,王炳辉.局部排水条件下南京细砂振动孔压的波动特性[J].岩土工程学报,2010,32(5):767-773.CHEN Guoxing,WANG Binghui.Fluctuating characteristics of excess pore water pressure in Nanjing fine sand under partially drained conditions[J].Journal of Geotechnical Engineering,2010,32(5):767-773.
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