乌鲁木齐三新区间地铁隧道浅埋暗挖法施工地表沉降研究

发布时间：2018-02-12 12:51

本文关键词： 浅埋暗挖隧道地表沉降规律 Peck法随机介质法预测参数　出处：《新疆大学》2017年硕士论文　论文类型：学位论文

【摘要】：通过对浅埋暗挖法施工引起地表沉降的机理进行了简单的分析,归纳总结了影响地表沉降的因素。以乌鲁木齐地铁1号线三~新区间为例,收集监测断面数据资料,着重对开挖方法、上覆土体岩性、隧道轴线埋深等因素进行探讨,分析不同因素对地表沉降的作用效果,总结不同影响因素作用下隧道施工产生的地表沉降规律。随后,进一步探讨Peck公式法和随机介质法预测参数的变化规律,通过筛选的三新区间典型监测断面资料,验证该些方法在乌鲁木齐地区的适用性,并分别对Peck公式法和随机介质法的预测参数进行反演,并拟合出基于本地区工程实测数据的拟合经验公式。通过研究得出如下结论:(1)隧道开挖各部以及最终产生的横向地表沉降槽,形状呈单峰波状,基本符合高斯正态分布曲线;Peck公式法在大断面隧道预测中具有良好的适用性。(2)在使用随即介质法进行地表沉降预测时,为了更好的使之适用于浅埋大断面隧道中,对断面收敛模型进行修正,即考虑隧道底部隆起的非均匀收敛模式,经工程算例验证,该种收敛模式较原有传统模式有着更高的预测精度。(3)拟合出本区间沉降槽反弯点距离i、地层损失率vi以及断面收敛半径ΔR、断面中心位移Δη、影响角tanβ等的经验值,为乌鲁木齐地铁后续施工提供参考。
[Abstract]:Based on the simple analysis of the mechanism of surface subsidence caused by shallow underground excavation construction, the factors affecting surface subsidence are summarized. Taking the third ~ new section of Urumqi Metro Line 1 as an example, the data of monitoring section are collected. The factors such as excavation method, overlying soil lithology, tunnel axis depth and so on are discussed, the effect of different factors on surface settlement is analyzed, and the law of surface settlement produced by tunnel construction under different influence factors is summarized. The variation law of prediction parameters by Peck formula method and random medium method is further discussed. The applicability of these methods in Urumqi region is verified by the typical monitoring section data of three new sections. The prediction parameters of Peck formula method and random medium method are inversed respectively. The fitting empirical formula based on the measured data of the local engineering is fitted. The following conclusions are drawn from the study: each part of the tunnel excavation and the transverse surface subsidence trough are formed, the shape of which is like a single peak wave. In accordance with Gao Si's normal distribution curve and Peck formula method, it has good applicability in large section tunnel prediction. In order to make it more suitable for shallow and large section tunnel, the random medium method is used to forecast surface settlement. The section convergence model is modified, that is, the non-uniform convergence model of the bottom uplift of the tunnel is considered, which is verified by an engineering example. The convergent model has a higher prediction precision than the traditional one.) the empirical values of the interval settlement trough inverse bending point distance I, formation loss rate vi, section convergence radius 螖 R, cross section center displacement 螖畏, influence angle tan 尾, etc., are fitted. To provide a reference for the future construction of Urumqi subway.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.4

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