深埋不同水頭條件下TBM管片結(jié)構(gòu)力學(xué)特性與結(jié)構(gòu)設(shè)計
發(fā)布時間：2018-09-16 20:46
【摘要】：通過使用ANSYS梁-彈簧模型,結(jié)合某大直徑深埋TBM公路隧道管片設(shè)計,對不同高度水頭下管片結(jié)構(gòu)力學(xué)特性進(jìn)行分析。得到隨著水頭高度的增加,管片結(jié)構(gòu)的力學(xué)特性主要分為4個階段。第一階段為拱頂受拉控制。水頭高度為0~1D,安全系數(shù)逐漸減小;第二階段仍然為拱頂受拉控制。水頭高度為1D~2D,安全系數(shù)逐漸增加;第三個階段為拱頂受拉轉(zhuǎn)變?yōu)楣澳_受壓控制。水頭高度為2D~4D,安全系數(shù)逐漸減小;第四階段屬于管片環(huán)拱腰位置受壓控制。水頭高度大于4D,安全系數(shù)繼續(xù)減小直到管片破壞。通過研究管片厚度、混凝土強(qiáng)度等級、配筋量3個設(shè)計因素對管片水頭承載能力的影響,提出不同水頭高度條件下的分段設(shè)計方法:管片處于第一和第二階段時,增加管片配筋量和管片厚度能顯著提高結(jié)構(gòu)安全性;管片處于第三和第四階段時,提高管片厚度和混凝土強(qiáng)度等級能顯著提高管片安全系數(shù)和最終的水頭承載能力。
[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.
【作者單位】： 西南交通大學(xué)交通隧道工程教育部重點實驗室;中國電建集團(tuán)成都勘測設(shè)計研究院有限公司;
【基金】：重慶市應(yīng)用開發(fā)計劃重點項目(cstc2014yykfB30003)
【分類號】：U455.4
，
本文編號：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.
【作者單位】： 西南交通大學(xué)交通隧道工程教育部重點實驗室;中國電建集團(tuán)成都勘測設(shè)計研究院有限公司;
【基金】：重慶市應(yīng)用開發(fā)計劃重點項目(cstc2014yykfB30003)
【分類號】：U455.4
，
本文編號：2244739
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