土岩结合地区地铁工程施工竖井断面形式及支护参数优化研究
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摘要
针对目前国内暗挖地铁工程施工竖井断面形式及支护参数设计多以工程类比法为主,设计安全系数偏大,没有充分利用支护与围岩自身性能的现状这一问题,以某土岩结合地区地铁工程为背景,选取多个竖井进行理论分析,通过数值方法对不同侧压荷载作用下,不同断面在不同深度位置受力情况进行分析研究。研究结果表明:竖井的断面形式及支护参数应根据其地质条件不同,结合地质条件下结构受力、使用功能进行综合比选进行确定。
The design of vertical shaft section and supporting parameters of metro construction is mainly based on the engineering analogy method, and the design safety factor is relatively large. Besides, the performance of supporting and surrounding rock itself are not fully utilized. Focusing on the problem mentioned above and based on the subway project in one region geologically composed of soil and rock, in this paper multiple construction shafts are selected for theoretical analysis. Through numerical simulation, the analysis and research are mainly conducted on the stress of different sections in different depth under effects of different lateral loads. It is shown that reasonable sections and supporting parameters of the constructed shafts should be determined by the comprehensive comparison and selection of structure stress and using purpose based on the geological conditions.
The design of vertical shaft section and supporting parameters of metro construction is mainly based on the engineering analogy method, and the design safety factor is relatively large. Besides, the performance of supporting and surrounding rock itself are not fully utilized. Focusing on the problem mentioned above and based on the subway project in one region geologically composed of soil and rock, in this paper multiple construction shafts are selected for theoretical analysis. Through numerical simulation, the analysis and research are mainly conducted on the stress of different sections in different depth under effects of different lateral loads. It is shown that reasonable sections and supporting parameters of the constructed shafts should be determined by the comprehensive comparison and selection of structure stress and using purpose based on the geological conditions.
引文
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[2] 李怀业.地铁工程造价动态管理中的问题及对策[J].价值工程,2014(19):93-95.
[3] 侯长虹.地铁工程实施阶段的造价管理[J].建材技术与应用,2014(4):43-44.
[4] 吴迪.隧道施工参数对地表沉降的影响研究[J].水利与建筑工程学报,2018,16(2):131-133.
[5] 白家设,赵绍鹏,齐兵,等.软弱地层浅埋大跨双连拱隧道支护结构变形研究[J].土木工程学报,2017,52(10):45-49.
[6] 刘颖.山岭隧道衬砌背后空洞对衬砌结构多因素影响分析[J].水利与建筑工程学报,2015,13(2):222-224.
[7] 何桥,叶明亮,田凯,等.浅埋暗挖隧道施工过程数值模拟分析[J].水利与建筑工程学报,2015,13(6):35-39.
[8] 杨建周,谷松博,郁圣维.松散围岩隧道力学特征及其超前支护措施研究[J].铁道勘察,2016,42(3):28-32.
[9] 中华人民共和国住房和城乡建设部.地铁设计规范:GB 50157—2013[S].北京:中国建筑工业出版社,2013:84-85.
[10] 赵兴东.超深竖井建设基础理论与发展趋势[J].金属矿山,2018(4):4-5.
[11] 安永林,欧阳鹏博,彭立敏,等.深大竖井及转隧道正洞施工技术与安全分析[J].现代隧道技术,2018,55(2):163-171.
[12] 李立云,邱忠旺,杜修力,等.地铁竖井施工过程中周边环境响应分析[J].工程地质学报,2018,26(4):1087-1093.
[13] 邱忠旺.长春地铁竖井数值仿真模拟研究[D].北京:北京工业大学,2016:55.
[14] 中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局.岩土锚杆与喷射混凝土支护工程技术规范:GB 50086—2015[S].北京:中国计划出版社,2016:45-50.
[15] 邓斌,饶和根,廖卫平,等.软岩隧道支护结构优化研究[J].铁道科学与工程学报,2017,14(10):2204-2210.