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现代隧道技术 2016, Vol. 53 Issue (5) :100-107    DOI:
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小净距隧道下穿薄层采空区引起的地层移动分析
(1 武汉地铁集团有限公司,武汉 430030; 2 西南交通大学交通隧道工程教育部重点实验室,成都 610031;3 云南省交通规划设计研究院,昆明 650011)
Analysis of Ground Settlement Induced by Small-Space Twin-Tube Tunnel Excavation Underneath a Mined-Out Area
(1 The Limited Company of Wuhan Metro, Wuhan, 430030; 2 Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031; 3 Broadvision Engineering Consultants, Kunming 650011)
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摘要 小净距隧道下穿采空区地层施工时, 相邻隧道的施工扰动会出现叠加, 严重影响采空区地层的稳定性。文章开展了小净距隧道下穿采空区地层施工的室内相似模型试验, 对施工过程中围岩及采空区的沉降进行了监测。试验考虑了采空区倾角为 15°和 25°两种情况, 通过控制岩块抗压强度和孔隙度两个指标, 实现了采空区地层离散性的模拟以及模型与原型的相似。结果表明: 采空区地层在左、 右洞及中岩墙上方有 3处沉降极值点, 其中先行洞上方沉降最大; 倾角越大, 采空区地层沉降越大、 沉降范围越广; 小净距隧道开挖引起的最大沉降较单洞高35%~74%, 且先行洞开挖对后行洞上方采空区地层沉降的影响小于后行洞开挖对先行洞上方采空区地层沉降的影响; 采空区地层沉降过程可分为 6个阶段, 其中左、 右洞开挖面通过时沉降发展较快。因此, 在实际施工过程中, 为了避免后行洞开挖时扰动范围的扩大, 后行洞开挖宜在先行洞开挖引起的采空区地层沉降稳定或二次衬砌施作后进行。
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张雪金 1 方 勇 2 杨 斌 3 刘书斌 2
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Abstract: During the construction of a small-space twin-tube tunnel underneath a mined-out area, the distur? bance from an adjacent tunnel excavation will be superimposed and the stability of the mined-out area is seriously affected. An indoor similar model test of a small-space twin-tube tunnel underneath the mined-out area was carried out and the settlement of the rock mass and around the mined-out area during excavation was monitored. Considering the two cases of formation dip angles of 15 ° and 25° in the mined-out area, the simulation of formation discreteness in the mined-out area and the similarity of the model to prototype was achieved by controlling the rock compressive strength and porosity in the mined-out area. Test results show that: 1) there are three extreme ground settlement points located in the left tunnel, right tunnel and middle rock wall of the mined-out area, respectively, with the maximum ground settlement occuring above the pilot tunnel; 2) the greater the dip angle is, the larger the settlement is and the wider the range of settlement is; 3) the maximum settlement induced by the small-space twintube tunnel excavation is about 35% to 74% higher than that of single-tube tunnel excavation, and the impact of pilot tunnel excavation on the settlement above the subsequent tunnel is less than that of the following tunnel excavation on the settlement above the pilot tunnel in the mined-out area; and 4) the settlement process of the mined-out area can be divided into six stages, and the settlement develops quickly during excavation of the left and right tunnel underneath the mined-out area. In order to avoid the extension of the disturbance range during the following tunnel excavation, excavation of the following tunnel should be performed after stabilization of the mined-out area settlement induced by the pilot tunnel excavation or installation of the secondary lining of the pilot tunnel.
KeywordsHighway tunnel,   Mined-out area,   Small-space twin-tube tunnel,   Model test,   Ground settlement     
基金资助:

基金项目: 国家自然科学基金 (51278422); 国家科技支撑计划课题(2012BAG05B03); 四川省青年科技基金(2012JQ0021); 中央高校基本科研业务费专项资金 (SWJTU11ZT33) .

作者简介: 作者简介: 张雪金(1988-), 男, 硕士, 从事隧道施工建设工作, E-mail: Zhangxj0400@whrt.gov.cn. 通讯作者: 方 勇(1981-), 男, 副教授, 博士, 硕士生导师, 从事隧道施工力学研究工作, E-mail: fy980220@swjtu.cn
引用本文:   
张雪金 1 方 勇 2 杨 斌 3 刘书斌 2 .小净距隧道下穿薄层采空区引起的地层移动分析[J]  现代隧道技术, 2016,V53(5): 100-107
ZHANG Xue-Jin- 1 Fang- Yong- 2 Yang- Bin- 3 Liu-Shu-Bin- 2 .Analysis of Ground Settlement Induced by Small-Space Twin-Tube Tunnel Excavation Underneath a Mined-Out Area[J]  MODERN TUNNELLING TECHNOLOGY, 2016,V53(5): 100-107
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