湛江软土震陷特性试验研究
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摘要
通过进行应力控制的循环三轴试验,研究了湛江钢铁海漫滩、海积平原区域淤泥质土的震陷特性,充分考虑了土体围压、固结比、循环应力比的大小对残余应变的影响,得到了软粘土残余应变随振动次数、围压、固结比、循环应力比而变化的规律。结果发现不同因素的影响存在耦合的作用,残余应变的发展主要表现为衰减型曲线和破坏型曲线,可分别用对数关系曲线模型和指数关系曲线模型进行预测,对该区域的防震建设提供了有价值的参考。
Through the dynamic triaxial tests under controlling the stress,the characteristics of seismic settlement of soft soil in Zhanjiang were analyzed.Considering the influence of the confined pressure,consolidation ratio,dynamic stress ratio,the laws of residual strain changing with cyclic number,confined pressure,consolidation ratio,dynamic stress ratios were obtained respectively.The results show that there is a coupling relationship among different factor's influences of the residual strain,and it can be subdivided into types of attenuation curves and failure curves which could be forecasted by logarithmic relationship curve model and exponential relationship curve model separately.The results in this paper is of great value to the earthquake prevention construction of the region.
Through the dynamic triaxial tests under controlling the stress,the characteristics of seismic settlement of soft soil in Zhanjiang were analyzed.Considering the influence of the confined pressure,consolidation ratio,dynamic stress ratio,the laws of residual strain changing with cyclic number,confined pressure,consolidation ratio,dynamic stress ratios were obtained respectively.The results show that there is a coupling relationship among different factor's influences of the residual strain,and it can be subdivided into types of attenuation curves and failure curves which could be forecasted by logarithmic relationship curve model and exponential relationship curve model separately.The results in this paper is of great value to the earthquake prevention construction of the region.
引文
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[12]张茹,何昌荣,等.固结应力比对土样动强度和动孔压发展规律的影响[J].岩土工程学报,2006.01,28(1):101-105.
[13]王常晶,陈云敏.交通荷载引起的静偏应力对饱和软黏土不排水循环性状影响的试验研究[J].岩土工程学报,2007,29(11):1742-1747.
[14]黄茂松,李进军,等.饱和软粘土的不排水循环累积变形特性[J].岩土工程学报,2006,28(7):891-895.
[2]Luo W.K..The characteristics of soils subjected to repeatedloads and their applications to engineering practice[J].Soils andFoundation,1973,13(1):11-27.
[3]郁寿松,石兆吉.土壤震陷试验研究[J].岩土工程学报,1989,11(4):35-44.
[4]谢君斐,石兆吉.液化危害性分析[J].地震工程与工程振动,1988,8(1):61-77.
[5]朱定华,施军建,陈国兴.防灾减灾工程学报[J].南京新近沉积淤泥质土震陷特性试验研究.2008,2,28(1):26-31.
[6]Matsui T.Cyclic stress-strain history and shear characteristics ofclay[J].Journal of Geotechnical Engineering Division,AmericaSociety of Civil Engineering,1980,106(10):1101-1120.
[7]Sakai A,Samang L,Miura N.Partially-drained cyclic behaviorand its application to the settlement of a low embankment road onsilty-clay[J].Soils and Foundations,2003,43(1):33-46.
[8]G G Moses a,S N Rao a,P N Rao,Undrained strength behaviourof a cemented marine clay under monotonic and cyclic loading[J].Ocean Engineering,2003,30(1):1765-1789.
[9]周建,龚晓南.循环荷载作用下饱和软黏土应变软化研究[J].土木工程学报,2000,32(5):62-68.
[10]廖化荣.红黏土路基循环动荷载下塑性力学行为及预测模型研究[D].广州:中山大学,2004.
[11]唐益群,黄雨,等.地铁列车荷载作用下隧道周围土体的临界动应力比和动应变分析[J].岩石力学与工程学报,2003,23(9):1566-1570.
[12]张茹,何昌荣,等.固结应力比对土样动强度和动孔压发展规律的影响[J].岩土工程学报,2006.01,28(1):101-105.
[13]王常晶,陈云敏.交通荷载引起的静偏应力对饱和软黏土不排水循环性状影响的试验研究[J].岩土工程学报,2007,29(11):1742-1747.
[14]黄茂松,李进军,等.饱和软粘土的不排水循环累积变形特性[J].岩土工程学报,2006,28(7):891-895.
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