冲击荷载下土体位移特征研究
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摘要
建立了冲击荷载作用下土体动力压密有限元方程及其数值计算方法。用Ansys-Ls-dyna软件包对山西化肥厂地基冲击荷载作用后土体的动力响应进行了分析,得出了冲击荷载作用下分层土体中的位移分布特征及其它们的变化过程,计算结果与实测结果吻合较好。研究结果表明:冲击荷载作用下土体位移的影响范围为一椭球体。侧向加固半径距荷载作用中心接近2D(D为夯锤直径),荷载作用中心下加固深度能达到2D甚至更大。
The dynamic compaction finite element equation and the numerical analysis method of soils subjected to the impact loading are established.Ansys-Ls-dyna software is used to analyze the soil dynamic response of Shanxi Fertilizer Factory's layer soils subjected to the impact loading.The distributed characteristics of displacement and its change courses are studied and compared with experimental figures.It proves that the calculation results approximate the experimental data.It results that the displacement influence scope of the impact load in the soils is an ellipsoid.The lateral reinforced radius from the center of loading is 2D(D is a the diameter of tamping hammer),the reinforced depth under the center of loading is also 2D or larger.
The dynamic compaction finite element equation and the numerical analysis method of soils subjected to the impact loading are established.Ansys-Ls-dyna software is used to analyze the soil dynamic response of Shanxi Fertilizer Factory's layer soils subjected to the impact loading.The distributed characteristics of displacement and its change courses are studied and compared with experimental figures.It proves that the calculation results approximate the experimental data.It results that the displacement influence scope of the impact load in the soils is an ellipsoid.The lateral reinforced radius from the center of loading is 2D(D is a the diameter of tamping hammer),the reinforced depth under the center of loading is also 2D or larger.
引文
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[2]Brandel H,Matsuoka H,Dynamic Stresses in Soil Caused by Falling Weights[A].Proceedings of 9th International Conference on Soil Mechanics and Foundation Engineering[C].[s.l.]:[s.n.],1977.187-194.
[3]Thilakasiri S,Millins G,Stinnette P,Gunaratne M,Jory B,Analytical and experimental investigation of dynamic compaction induced stresses[J].Geotechnics,1993,11(3):85-89
[4]尚世佐.强夯加固饱和软粘土的几个问题探讨[J].建筑结构学报,1983,(2):55-69.SHANG Shi-zuo.Some aspects about the treatment on saturated soft clay by dynamic sonsolidation[J].Journal of Architecture and Structure,1983,(2):55-69.
[5]钱家欢,钱学德,赵维炳,等.动力固结的理论与实践[J].岩土工程学报,1986,8(6):1-17.QIAN Jia-huan,QIAN Xue-de,ZHAO Wei-bing,et al.Theory and practice of dynamic consolidation[J].Chinese Journal of Geotechnical Engineering,1986,8(6):1-17.
[6]吴铭炳,王钟琦.强夯机理的数值分析[J].工程勘察,1989,(3):1-5.WU Ming-bing,WANG Zhong-qi.Numerical analysis of mechanism in dynamic consolidation[J].Engineering Survey,1989,(3):1-5.
[7]廖振鹏.局部透射边界的精度[J].地震工程与工程振动,1993,13(3):1-6.LIAO Zheng-peng.Accuracies of local transmitting boundaries[J].Earthquale Engineering and Engineering Vibration,1993,13(3):1-6.
[8]孔令伟,袁建新.强夯作用下成层地基的表面接触应力分布特征[J].力学学报,1999,31(2):250-256.KONG Ling-wei,YUAN Jian-xin.Study on surface contact stress distribution properties for multi-layered foundation during dynamic consolidation[J].Acta Mechanica Sinica,1999,31(2):250-256.
[9]孔令伟,袁建新.强夯的边界接触应力与沉降特性研究[J].岩土工程学报,1998,21(2):86-92.KONG Ling-wei,YUAN Jian-xin,Study on surface contact stress and settlement propertied during dynamic consolidation[J].Chinese Journal of Geotechnical Engineering,1998,21(2):86-92.
[10]杨桂通.土动力学[M].北京:中国建材工业出版社,2000.
[11]牛志荣,杨桂通.强夯作用下土体动力特性研究[J].工程力学(待发表).
[12]牛志荣,杨桂通.夯后土体动应力和位移特性数值分析[A].第十三届全国结构工程学术会议论文集[C].南昌:中国力学学会《工程力学》期刊社,2004.
[13]牛志荣,土体动力压密问题及其工程应用[博士学位论文D].太原:太原理工大学,2003.
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