层状地基分界面及土体参数变化对土体振动响应影响研究
Study on the influence of layered foundation parameters and soil interface on soil vibration response
刘晶磊 1尚康君 1张伯扬 1周玮浩 1毕全超 1魏来星2
作者信息
- 1. 河北省土木工程诊断、改造与抗灾重点实验室,075000张家口;河北建筑工程学院,075000张家口
- 2. 石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,050043石家庄;石家庄铁道大学土木工程学院,050043石家庄
- 折叠
摘要
为研究空沟在层状地基上时,土体参数和土体分界面对土体振动响应的影响,采用Comsol仿真物理场建立了二维有限元分析模型.在研究中,分析了层状地基不同土体参数时的土体振动响应表现差异,结果表明:空沟在深度达到层状地基的土体分界面附近时会出现振动加强现象,该现象受到分层土体的泊松比和密度以及弹性模量的影响.土体参数的变化同样会导致土体振动响应的变化,具体表现为密度越大则土体振动响应就越大;而弹性模量和泊松比则需考虑分层情况.其中下层弹性模量越大则土体振动响应越大,上层则与之相反;下层泊松比越小则土体振动响应越大,而上层在空沟深度小于一定范围内时时表现为泊松比越小土体振动响应越大,在当达到一定深度后,上层土体不同泊松比的加速度大小曲线呈现交错状态.
Abstract
In order to study the influence of soil parameters and soil interface on soil vibration response when the hollow trench is on the layered foundation,a two-dimensional finite element analysis model was established by using the Comsol simulation physical field.In the study,the difference in soil vibration re-sponse performance of layered foundations with different soil parameters was analyzed,and the results showed that when the depth of the hollow trench reaches near the soil interface of the layered foundation,the vibration intensification phenomenon occurs,and this phenomenon is divided.The influence of the Poisson's ratio and density of the layered soil as well as the modulus of elasticity.Changes in soil parame-ters will also lead to changes in the vibration response of the soil.Specifically,the greater the density,the greater the vibration response of the soil;while the elastic modulus and Poisson's ratio need to be consid-ered for delamination.The greater the elastic modulus of the lower lay er,the greater the vibration response of the soil,and the opposite is the case for the upper layer;the lower the Poisson's ratio of the lower layer,the greater the vibration response of the soil,while the upper layer exhibits Poisson's ratio when the trench depth is less than 0.5 m.The smaller the soil mass,the greater the vibration response,but when the depth is greater than 0.5 m,the resulting acceleration curve shows a staggered state.
关键词
土体分界面/密度/弹性模量/泊松比/土体振动响应/振动增加Key words
soil interface/density/elastic modulus/Poisson's ratio/soil vibration response/vibration in-crease引用本文复制引用
基金项目
河北省高等学校科学研究重点资助项目(ZD2022017)
青海省科技发展专项资助项目(2021QY-217)
河北省高等学校人文社会科学研究资助项目(BJ2019091)
出版年
2024
NETL
NSTL
万方数据