千斤顶作用下带榫管片的裂纹扩展规律
发布时间：2019-01-01 16:04
【摘要】：针对盾构隧道施工过程中带榫管片易出现裂纹及局部破损的现象,运用ABAQUS中的扩展有限单元法,建立了标准带榫管片的数值模型,并针对管片受力不均、千斤顶加压不同步和千斤顶偏心荷载3种不良施工荷载情况下的12个具体工况,对施工过程中带榫管片裂纹初始开裂位置、扩展方向及裂纹空间分布规律等进行了系统分析.研究结果表明:不良施工荷载是带榫管片产生裂纹的主要因素,荷载大的位置易产生裂纹,千斤顶先接触部位易产生裂纹;带榫管片凸榫端中部较两端易产生裂纹,带榫管片内弧面较外弧面更易产生裂纹;3种不良施工荷载对带榫管片的损害程度由强到弱依次为千斤顶偏心荷载、千斤顶加压不同步和管片受力不均.
[Abstract]:In view of the phenomenon that cracks and local breakage are easy to appear in the segment with tenon during the construction of shield tunnel, the numerical model of the standard tenon segment is established by using the extended finite element method in ABAQUS, and the stress of the segment is not uniform. Under three kinds of bad construction loads, the initial crack position, propagation direction and crack spatial distribution of the crack with tenon and tenon in the construction process are analyzed systematically under three kinds of bad construction loads: the pressure of the Jack is out of sync and the eccentricity load of the Jack. The research results show that the bad construction load is the main factor to produce crack in the mortise pipe, the crack is easy to occur in the position with large load, and the crack in the contact part of the Jack at first. It is easier to produce cracks in the middle part of the convex tenon end than at both ends, and the inner arc surface is more prone to crack than the outer arc surface. The damage degree of the three kinds of bad construction load to the mortified segment is the eccentric load of the Jack from strong to weak, the pressure of the Jack is out of sync and the force of the segment is uneven.
【作者单位】： 西南交通大学交通隧道工程教育部重点实验室;
【基金】：国家自然科学基金面上项目(51278424,51578461)
【分类号】：U455.43
，
本文编号：2397785
[Abstract]:In view of the phenomenon that cracks and local breakage are easy to appear in the segment with tenon during the construction of shield tunnel, the numerical model of the standard tenon segment is established by using the extended finite element method in ABAQUS, and the stress of the segment is not uniform. Under three kinds of bad construction loads, the initial crack position, propagation direction and crack spatial distribution of the crack with tenon and tenon in the construction process are analyzed systematically under three kinds of bad construction loads: the pressure of the Jack is out of sync and the eccentricity load of the Jack. The research results show that the bad construction load is the main factor to produce crack in the mortise pipe, the crack is easy to occur in the position with large load, and the crack in the contact part of the Jack at first. It is easier to produce cracks in the middle part of the convex tenon end than at both ends, and the inner arc surface is more prone to crack than the outer arc surface. The damage degree of the three kinds of bad construction load to the mortified segment is the eccentric load of the Jack from strong to weak, the pressure of the Jack is out of sync and the force of the segment is uneven.
【作者单位】： 西南交通大学交通隧道工程教育部重点实验室;
【基金】：国家自然科学基金面上项目(51278424,51578461)
【分类号】：U455.43
，
本文编号：2397785
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2397785.html
