长江下游水下地基土两类参数相关关系试验研究
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摘要
为深入研究土体物理力学参数的归类和相互之间的关系,采集苏通长江公路大桥水下地基土勘探钻孔中的大量土样,对土样进行了各种类型的土工试验,获取了地基土各类物理力学参数。对各类参数进行综合分析的基础上,将地基土参数分为测试参数和导出参数。并利用统计回归分析,得到了导出参数和测试参数间的相关曲线、相关方程式及相关系数。发现压缩模量与测试参数成好的指数关系,相关系数为0.8548~0.8701;压缩系数与测试参数也成指数关系,与标贯的相关关系为0.7338,与天然密度、干密度、天然孔隙比、天然含水量的相关关系为0.8982~0.9222;液性指数与标贯成指数关系,相关系数为0.8557;与其它测试参数的线性相关系数为0.9401~0.9596;塑限与测试参数成线性关系,相关系数为0.74132~0.75901;粘聚力与测试参数成指数关系,相关系数为0.7158~0.7988;电阻率与测试参数成指数关系,相关系数为0.9358~0.9852。结果表明,通过建立导出参数和测试参数之间的数学回归关系式来确定新的工程区的压缩模量、压缩系数、粘聚力、塑限、液性指数、电阻率等参数不失为一个有效而适用的方法,这些回归方程式能为长江下游及类似地区地基土参数的计算和预测提供重要参考。
In order to study the classification and interrelation of soil physical and mechanical parameters,large numbers of soil samples under water were collected from the drilling holes in the foundation of Sutong bridge in lower reaches of Yangtze River.All sorts of geotechnical tests were conducted for the collected samples,and a variety of physical parameters and mechanical parameters were obtained.Based on synthetical analysis to all parameters,soil parameters were divided into testing parameters(including moisture capacity,void ration,density,standard penetration test(SPT)) and educing parameters(including modulus of compression,coefficient of compressibility,cohesion,angle of internal friction,plastic limit,liquid limit,plasticity index,liquidity index,resistivity,et al.).Through statistical regression analysis,regression curves,regression equations and correlativity coefficients between educing parameters and testing parameters were achieved.It is found that,firstly,there exists good exponential correlativity between modulus of compression,coefficient of compressibility and the testing parameters,the correlativity coefficient between modulus of compression and the testing parameters is from 0.8548 to 0.8701;the correlativity coefficient between coefficient of compressibility and SPT is 0.7338;the correlativity coefficient between coef-ficient of compressibility and natural density,dry density,natural void ration and natural moisture capacity is 0.8982～0.9222.Secondly,there exists good exponential correlativity between liquidity index and SPT,the correlativity coefficient is 0.8557,the linear correlativity coefficient between liquidity index and other testing parameters is 0.9401～0.9596,and the linear correlativity coefficient between plastic limit and testing parameters is 0.74132～0.75901.Thirdly,the exponential correlativity coefficient between cohesion and testing parameters is 0.7158～0.7988,and the exponential correlativity coefficient between resistivity and testing parameters is 0.9358～0.9852.The following conclusions can be drawn that the confirmation of modulus of compression,coefficient of compressibility,cohesion,plastic limit,liquidity index and resistivity by the mathematic correlativity equations between educing parameters and testing parameters is an effective and practical method,and these regression formulae can offer important reference for the calculation and estimation of the parameters of soft soil in the lower reaches of Yangtze River and similar area.
In order to study the classification and interrelation of soil physical and mechanical parameters,large numbers of soil samples under water were collected from the drilling holes in the foundation of Sutong bridge in lower reaches of Yangtze River.All sorts of geotechnical tests were conducted for the collected samples,and a variety of physical parameters and mechanical parameters were obtained.Based on synthetical analysis to all parameters,soil parameters were divided into testing parameters(including moisture capacity,void ration,density,standard penetration test(SPT)) and educing parameters(including modulus of compression,coefficient of compressibility,cohesion,angle of internal friction,plastic limit,liquid limit,plasticity index,liquidity index,resistivity,et al.).Through statistical regression analysis,regression curves,regression equations and correlativity coefficients between educing parameters and testing parameters were achieved.It is found that,firstly,there exists good exponential correlativity between modulus of compression,coefficient of compressibility and the testing parameters,the correlativity coefficient between modulus of compression and the testing parameters is from 0.8548 to 0.8701;the correlativity coefficient between coefficient of compressibility and SPT is 0.7338;the correlativity coefficient between coef-ficient of compressibility and natural density,dry density,natural void ration and natural moisture capacity is 0.8982～0.9222.Secondly,there exists good exponential correlativity between liquidity index and SPT,the correlativity coefficient is 0.8557,the linear correlativity coefficient between liquidity index and other testing parameters is 0.9401～0.9596,and the linear correlativity coefficient between plastic limit and testing parameters is 0.74132～0.75901.Thirdly,the exponential correlativity coefficient between cohesion and testing parameters is 0.7158～0.7988,and the exponential correlativity coefficient between resistivity and testing parameters is 0.9358～0.9852.The following conclusions can be drawn that the confirmation of modulus of compression,coefficient of compressibility,cohesion,plastic limit,liquidity index and resistivity by the mathematic correlativity equations between educing parameters and testing parameters is an effective and practical method,and these regression formulae can offer important reference for the calculation and estimation of the parameters of soft soil in the lower reaches of Yangtze River and similar area.
引文
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[13]Fang Yonglun,Ren Jianwei,Li Yaping,et al.The experi-ence relation between coefficient of compressibility and voidration in Kaifeng area[J].Journal of Yellow River Conser-vancy Technical Institute,2004,16(1):43-44.[方永伦,任建伟,李亚平,等.开封地区土的压缩系数和孔隙比的经验关系[J].黄河水利职业技术学院学报,2004,16(1):43-44.]
[14]Huang Tao.The method confirming modulus of compres-sion of silt and sand soil by SPT[J].Reconnaissance Sci-ence and Technology,1997(5):11-15.[黄涛.一种用标贯击数直接确定粉土、砂土压缩模量的方法[J].勘察科学技术,1997(5):11-15.]
[15]南京大学地球科学系.苏通长江公路大桥工程可行性阶段工程地质综合研究报告[R].2000.
[16]南京大学地球科学系.苏通长江公路大桥工程初步设计阶段地层分类与设计参数专题研究报告[R].2002.
[17]Yang Jie,Wu Zhongru.Research on tie multicollinearityexisting in observation data simulation and analysis[J].Journal of Sichuan University:Engineering Science Edition,2005,37(5):19-24.[杨杰,吴中如.观测数据拟合分析中的多重共线性问题[J].四川大学学报:工程科学版,2005,37(5):19-24.]
[2]Pradeep UK,Erin P G.Prediction of soil composition fromCPTdata using general regression neural network[J].Jour-nal of Computing in Civil Engineering,2006,4(1):281-289.
[3]Wang Zhao,Chen Cunhong,Wang Jinzhong.Application ofFRP screw anchor in repairing of canal slope of expansivesoils[J].Journal of Sichuan University:Engineering Sci-ence Edition,2007,39(4):1-5.[王钊,陈春红,王金忠.玻璃钢螺旋锚在修复膨胀土渠坡中的应用[J].四川大学学报:工程科学版,2007,39(4):1-5.]
[4]Li Hongbo,Yao Lingkan,Li Shixiong,et al.Another expla-nation of sand pile avalanches power law distribution[J].Journal of Sichuan University:Engineering Science Edition,2007,39(4):35-39.[李洪波,姚令侃,李仕雄,等.砂堆雪崩幂律分布现象的解释[J].四川大学学报:工程科学版,2007,39(4):35-39.]
[5]Yang Shuyan,Jiang Qiliang,Li Xinguo.Analysis on seis-mic response effect of tunnel to nearby structure[J].Jour-nal of Sichuan University:Engineering Science Edition,2007,39(3):41-46.[杨书燕,姜忻良,李新国.隧道对临近建筑物的地震反应影响分析[J].四川大学学报:工程科学版,2007,39(3):41-46.]
[6]Shen Rongxi,Liu Changwu,Wu Xiuyi.Analysis and calcu-lation on roof separation critical values of solid-coal roadwayand gob-side roadway supported with bolts[J].Journal ofSichuan University:Engineering Science Edition,2007,39(3):19-23.[沈荣喜,刘长武,吴秀仪.锚网煤巷顶板离层临界值的计算和分析[J].四川大学学报:工程科学版,2007,39(3):19-23.]
[7]Li Dianqing,Chang Xiaolin.Impact of soil nail pullout testson estimation of bond stress[J].Journal of Sichuan Univer-sity:Engineering Science Edition,2006,38(3):17-23.[李典庆,常晓林.土钉抗拔试验对粘结强度估计的影响[J].四川大学学报:工程科学版,2006,38(3):17-23.]
[8]Wang Xuebin.Effect of joint inclination on deformation andfailure of rock specimen with a single joint in plane straincompression[J].Journal of Sichuan University:EngineeringScience Edition,2006,38(2):24-29.[王学滨.节理倾角对单节理岩样变形破坏影响的数值模拟[J].四川大学学报:工程科学版,2006,38(2):24-29.]
[9]Zheng Meitian,Li Jingyuan,Zheng Xiaozhan.Discussionon the relationship of linear correlation between blowcount ofstandard penetration test and modulus of compression in thealluviation clay of powder quality[J].Guangzhou Contruc-tion,2004(3):21-24.[郑美田,黎镜源,郑小战.冲击粉质粘土层压缩模量与标准贯入击数线性相关关系探讨[J].广州建筑,2004(3):21-24.]
[10]Gong Wenhui,Li Peng,Luo Chongyang.Application ofregression analysis in soil test[J].Journal of HUST:UrbanScience Edition,2006,23(Supp 1):34-35.[龚文惠,李鹏,罗重阳.土工试验中回归分析法的应用[J].华中科技大学学报:城市科学版,2006,23(增1):34-35.]
[11]Zhao Jianfeng.The estimation of bearing capacity of cohe-sive soil by natural moisture capacity[J].Roadbed Engi-neering,1997(3):6-10.[赵建峰.用天然含水量估算饱和粘性土的基本承载力[J].路基工程,1997(3):6-10.]
[12]Zhu Ruicheng.Estimated index of nature water content ofsaturated soft soil and sit-up of w-eregressive equation[J].West-China Exploration Engineering,1994,6(4):46-48.[朱瑞成.饱和软土天然含水量估算指标及w-e回归方程的建立[J].西部探矿工程,1994,6(4):46-48.]
[13]Fang Yonglun,Ren Jianwei,Li Yaping,et al.The experi-ence relation between coefficient of compressibility and voidration in Kaifeng area[J].Journal of Yellow River Conser-vancy Technical Institute,2004,16(1):43-44.[方永伦,任建伟,李亚平,等.开封地区土的压缩系数和孔隙比的经验关系[J].黄河水利职业技术学院学报,2004,16(1):43-44.]
[14]Huang Tao.The method confirming modulus of compres-sion of silt and sand soil by SPT[J].Reconnaissance Sci-ence and Technology,1997(5):11-15.[黄涛.一种用标贯击数直接确定粉土、砂土压缩模量的方法[J].勘察科学技术,1997(5):11-15.]
[15]南京大学地球科学系.苏通长江公路大桥工程可行性阶段工程地质综合研究报告[R].2000.
[16]南京大学地球科学系.苏通长江公路大桥工程初步设计阶段地层分类与设计参数专题研究报告[R].2002.
[17]Yang Jie,Wu Zhongru.Research on tie multicollinearityexisting in observation data simulation and analysis[J].Journal of Sichuan University:Engineering Science Edition,2005,37(5):19-24.[杨杰,吴中如.观测数据拟合分析中的多重共线性问题[J].四川大学学报:工程科学版,2005,37(5):19-24.]
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