穿越富水砂层冻结斜井冻结壁变形规律研究

发布时间：2018-07-03 05:38

本文选题：富水砂层 + 冻结斜井　；参考：《西安科技大学》2015年硕士论文

【摘要】：开展富水砂层冻结斜井冻结壁变形规律研究具有重要的工程应用价值。本文以袁大滩冻结斜井工程为依托,采用理论分析、有限元模拟和现场实测的方法对穿越富水砂层冻结斜井冻结壁变形规律进行研究。主要结论有:(1)将井筒分为浅埋和深埋两种情况,分别采用岩柱法和普氏理论对斜井冻结壁厚度进行设计,给出了在浅埋和深埋条件下斜井冻结壁计算公式,结合袁大滩冻结斜井工程现场实际情况,计算出袁大滩斜井冻结壁厚度:浅埋时冻结壁厚度分别为:顶板2.5m,两帮1m,底板0.5m;深埋时冻结壁厚度分别为:顶板4.88m,两帮3.6m,底板3.9m。(2)随着冻结壁空顶距离的增大,冻结壁在水平向的位移呈“竖向”圆弧状分布;冻结壁竖向位移由条带状分布逐渐变为“水平”圆弧状分布;对比有限元模拟和现场实测结果可知,富水砂层地区冻结斜井空顶距离为20m时,不仅能够保证冻结壁的安全稳定,还能减少施工循环,达到快速施工的目的。(3)根据袁大滩冻结斜井工程现场实测结果可知,冻结壁下沉量有如下关系:顶板沉降右帮1/2拱处左帮1/2拱处,且顶板沉降速率最大;埋深越大顶板沉降越大,而且随着迎头面向前推进冻结壁沉降速率也随之增大。(4)井筒开挖后工作面温度自下而上逐渐升高,过了中心点之后又逐渐降低,且开挖后工作面温度呈现先降低后升高的趋势。
[Abstract]:It is of great engineering application value to study the deformation law of frozen wall of frozen inclined well in water rich sand layer. Based on the frozen inclined shaft project of Yuan Da Tan, the deformation law of frozen wall of frozen inclined well crossing rich water sand layer is studied by means of theoretical analysis, finite element simulation and field measurement. The main conclusions are as follows: (1) the shaft is divided into shallow water. The thickness of the frozen wall of inclined well is designed by rock column method and prun theory, and the calculation formula of the freezing wall of inclined shaft in shallow and deep buried conditions is given. The frozen wall thickness of Yuanda beach is calculated by combining with the actual situation of the frozen inclined shaft in Yuanda beach. The thickness of the frozen wall of Yuanda beach is calculated in the shallow buried and deep buried conditions. The thickness of the frozen wall is 2.5m, respectively, when shallow buried. Two groups of 1m and floor 0.5m, the thickness of the frozen wall in deep buried is 4.88m, two 3.6m, and 3.9m. (2) in the floor, the horizontal displacement of the frozen wall is "vertical" circular arc, and the vertical displacement of the frozen wall is gradually changed from strip distribution to the "horizontal" circular arc, and the finite element simulation and the scene are compared. The measured results show that the air top distance of the frozen inclined shaft in the rich water sand layer is 20m, not only can ensure the safety and stability of the freezing wall, but also reduce the construction cycle and achieve the purpose of rapid construction. (3) according to the site measured results of the frozen slope project in Yuan Da beach, the settlement of the frozen wall has the following relation: the left side of the right side of the roof settlement at the right side of the 1/2 arch 1/2 The subsidence rate of the roof is the largest in the arch and the greater the depth of the roof, and the settlement rate of the frozen wall increases with the front facing forward. (4) the temperature of the working face increases gradually after the excavation of the shaft, and then gradually decreases after the center point, and the temperature of the working surface after the excavation decreases first and then then increases.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD325

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