深埋不同水头条件下TBM管片结构力学特性与结构设计
发布时间：2018-09-16 20:46
【摘要】：通过使用ANSYS梁-弹簧模型,结合某大直径深埋TBM公路隧道管片设计,对不同高度水头下管片结构力学特性进行分析。得到随着水头高度的增加,管片结构的力学特性主要分为4个阶段。第一阶段为拱顶受拉控制。水头高度为0~1D,安全系数逐渐减小;第二阶段仍然为拱顶受拉控制。水头高度为1D~2D,安全系数逐渐增加;第三个阶段为拱顶受拉转变为拱脚受压控制。水头高度为2D~4D,安全系数逐渐减小;第四阶段属于管片环拱腰位置受压控制。水头高度大于4D,安全系数继续减小直到管片破坏。通过研究管片厚度、混凝土强度等级、配筋量3个设计因素对管片水头承载能力的影响,提出不同水头高度条件下的分段设计方法:管片处于第一和第二阶段时,增加管片配筋量和管片厚度能显著提高结构安全性;管片处于第三和第四阶段时,提高管片厚度和混凝土强度等级能显著提高管片安全系数和最终的水头承载能力。
[Abstract]:By using ANSYS beam-spring model and combined with the segment design of a large diameter deep buried TBM highway tunnel, the structural mechanical properties of the subducts with different water heads are analyzed. With the increase of head height, the mechanical properties of segment structure are divided into four stages. The first stage is controlled by the dome. The head height is 0 ~ 1D, the safety factor decreases gradually, and the second stage is still controlled by the dome. The head height is 1D ~ 2D, the safety factor increases gradually, and the third stage is that the arch top is under tension and the arch foot is controlled by pressure. The water head height is 2 DX 4D, the safety factor decreases gradually, and the fourth stage belongs to the pressure control of segment ring arched waist position. Head height greater than 4 D, safety factor continues to decrease until segment failure. By studying the influence of three design factors, the thickness of segment, the grade of concrete strength and the quantity of reinforcement, on the bearing capacity of water head of segment, this paper puts forward the subsection design method under different water head height: when the segment is in the first and second stages, When the segment is in the third and fourth stage, the safety factor and ultimate head bearing capacity can be improved by increasing the thickness of the segment and the strength grade of concrete.
【作者单位】： 西南交通大学交通隧道工程教育部重点实验室;中国电建集团成都勘测设计研究院有限公司;
【基金】：重庆市应用开发计划重点项目(cstc2014yykfB30003)
【分类号】：U455.4
，
本文编号：2244739
[Abstract]:By using ANSYS beam-spring model and combined with the segment design of a large diameter deep buried TBM highway tunnel, the structural mechanical properties of the subducts with different water heads are analyzed. With the increase of head height, the mechanical properties of segment structure are divided into four stages. The first stage is controlled by the dome. The head height is 0 ~ 1D, the safety factor decreases gradually, and the second stage is still controlled by the dome. The head height is 1D ~ 2D, the safety factor increases gradually, and the third stage is that the arch top is under tension and the arch foot is controlled by pressure. The water head height is 2 DX 4D, the safety factor decreases gradually, and the fourth stage belongs to the pressure control of segment ring arched waist position. Head height greater than 4 D, safety factor continues to decrease until segment failure. By studying the influence of three design factors, the thickness of segment, the grade of concrete strength and the quantity of reinforcement, on the bearing capacity of water head of segment, this paper puts forward the subsection design method under different water head height: when the segment is in the first and second stages, When the segment is in the third and fourth stage, the safety factor and ultimate head bearing capacity can be improved by increasing the thickness of the segment and the strength grade of concrete.
【作者单位】： 西南交通大学交通隧道工程教育部重点实验室;中国电建集团成都勘测设计研究院有限公司;
【基金】：重庆市应用开发计划重点项目(cstc2014yykfB30003)
【分类号】：U455.4
，
本文编号：2244739
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