基于Copula函数的循环荷载作用下地基沉降分析
发布时间：2018-08-31 19:30
【摘要】：对基于Copula函数的抗剪强度参数联合分布模型和循环荷载对地基沉降系统失效概率的影响规律进行研究,并利用ABAQUS有限元模拟了循环荷载作用下地基沉降规律,对所提方法的有效性进行验证。提出了循环荷载作用下的地基沉降系统失效概率模型,将该方法应用到重庆市金佛山溢洪道工程实例中。结果表明:抗剪强度参数间相关性和循环荷载作用下的Copula函数类型对地基沉降有很重要的影响,不同Copula函数所计算得到的地基沉降系统失稳概率有很大差别,这种差别随溢洪道覆盖层抗剪强度参数间负相关性的增大而增大、随抗剪强度参数间变异系数的减小而增大、随溢洪道水位线的增加而减小、与循环荷载的次数基本无关。建立有限元分析模型,对循环荷载作用下的地基沉降进行分析,得到了每次循环荷载作用下的地基沉降值和地基沉降差,沉降值和沉降差的变化随着循环荷载次数的增加逐渐减小。计算结果表明,Copula函数的循环荷载作用下的地基沉降分析能够很好地反映地基沉降变化和系统失效概率,可为地基沉降分析提供有效的参考。
[Abstract]:The combined distribution model of shear strength parameters based on Copula function and the influence of cyclic load on failure probability of foundation settlement system are studied. The foundation settlement law under cyclic load is simulated by ABAQUS finite element method. The validity of the proposed method is verified. The failure probability model of foundation settlement system under cyclic load is proposed and applied to the engineering example of Jinfushan spillway in Chongqing. The results show that the correlation between shear strength parameters and the type of Copula function under cyclic load has an important effect on foundation settlement, and the instability probability of foundation settlement system calculated by different Copula functions is very different. This difference increases with the increase of negative correlation between shear strength parameters of spillway overburden, increases with the decrease of coefficient of variation among shear strength parameters, and decreases with the increase of water level of spillway, which is basically independent of the number of cyclic loads. The finite element analysis model is established to analyze the foundation settlement under the cyclic load, and the settlement value and the difference of the foundation settlement under each cyclic load are obtained. The variation of settlement value and settlement difference gradually decreases with the increase of cyclic load times. The calculation results show that the analysis of foundation settlement under cyclic load of Copula function can well reflect the variation of foundation settlement and the failure probability of the system, and can provide an effective reference for the analysis of foundation settlement.
【作者单位】： 重庆交通大学国家内河航道整治工程技术研究中心;重庆交通大学水利水运工程教育部重点实验室;重庆交通大学重庆市高校水工建筑物诊断技术与设备工程研究中心;
【基金】：“十二五”国家科技支撑计划资助项目(2015BAK09B01) 重庆市基础与前沿研究计划资助项目(重点)(cstc2015jcyjBX0139)
【分类号】：TV223
本文编号：2215947
[Abstract]:The combined distribution model of shear strength parameters based on Copula function and the influence of cyclic load on failure probability of foundation settlement system are studied. The foundation settlement law under cyclic load is simulated by ABAQUS finite element method. The validity of the proposed method is verified. The failure probability model of foundation settlement system under cyclic load is proposed and applied to the engineering example of Jinfushan spillway in Chongqing. The results show that the correlation between shear strength parameters and the type of Copula function under cyclic load has an important effect on foundation settlement, and the instability probability of foundation settlement system calculated by different Copula functions is very different. This difference increases with the increase of negative correlation between shear strength parameters of spillway overburden, increases with the decrease of coefficient of variation among shear strength parameters, and decreases with the increase of water level of spillway, which is basically independent of the number of cyclic loads. The finite element analysis model is established to analyze the foundation settlement under the cyclic load, and the settlement value and the difference of the foundation settlement under each cyclic load are obtained. The variation of settlement value and settlement difference gradually decreases with the increase of cyclic load times. The calculation results show that the analysis of foundation settlement under cyclic load of Copula function can well reflect the variation of foundation settlement and the failure probability of the system, and can provide an effective reference for the analysis of foundation settlement.
【作者单位】： 重庆交通大学国家内河航道整治工程技术研究中心;重庆交通大学水利水运工程教育部重点实验室;重庆交通大学重庆市高校水工建筑物诊断技术与设备工程研究中心;
【基金】：“十二五”国家科技支撑计划资助项目(2015BAK09B01) 重庆市基础与前沿研究计划资助项目(重点)(cstc2015jcyjBX0139)
【分类号】：TV223
【相似文献】
相关期刊论文 前5条
1 唐小松;李典庆;周创兵;方国光;;基于Copula函数的抗剪强度参数间相关性模拟及边坡可靠度分析[J];岩土工程学报;2012年12期
2 杨丰顺;邵东国;顾文权;肖淳;谭学志;杨海东;;基于Copula函数的区域需水量随机模拟[J];农业工程学报;2012年18期
3 李结华;王超;卞海文;王丽君;;基于Copula函数流域防洪分析[J];水电能源科学;2012年11期
4 陈士永;王祥三;张涛;赵春伟;;Copula函数和AR模型在洪水随机模拟中的应用[J];水电能源科学;2009年02期
5 莫淑红;沈冰;张晓伟;李占斌;;基于Copula函数的河川径流丰枯遭遇分析[J];西北农林科技大学学报(自然科学版);2009年06期
，本文编号：2215947
本文链接：https://www.wllwen.com/kejilunwen/shuiwenshuili/2215947.html
