矿山法隧道下穿既有盾构隧道微变形控制技术

发布时间：2018-07-28 10:37

【摘要】：北京地铁8号线矿山法隧道下穿既有运营10号线盾构隧道时,采用MIDAS/GTS NX有限元软件对穿越施工过程进行三维弹塑性数值模拟,研究锁扣管幕与全断面深孔注浆条件下隧道开挖对既有结构的影响。结果表明:管幕施工导致的既有结构沉降约占既有结构最终沉降量的40%;受左右线施工先后的影响,新建隧道上方既有结构沉降略显不对称;既有结构纵向沉降呈双凹槽形,最大沉降出现在左线隧道中心线正上方,最终沉降量为2.56 mm,满足结构沉降控制的要求。经实际工程验证,锁扣管幕与深孔注浆支护体系在控制既有结构沉降方面效果良好。
[Abstract]:MIDAS/GTS NX finite element software is used to simulate the three-dimensional elastic-plastic numerical simulation of the traversing construction process when the mine tunnel of Beijing Metro Line 8 undergoes the existing shield tunnel of Line 10. The influence of tunnel excavation on the existing structure under the conditions of lock tube curtain and full section deep hole grouting is studied. The results show that the settlement of the existing structure caused by the pipe curtain construction accounts for about 40% of the final settlement of the existing structure; affected by the construction sequence of the left and right lines, the settlement of the existing structure above the new tunnel is slightly asymmetrical, and the longitudinal settlement of the existing structure is in the shape of double grooves. The maximum settlement occurs directly above the center line of the left line tunnel, and the final settlement is 2.56 mm, which meets the requirements of structural settlement control. It is proved by practical engineering that lock pipe curtain and deep hole grouting support system are effective in controlling the settlement of existing structures.
【作者单位】：北京工业大学城市与工程安全减灾省部共建教育部重点实验室;内蒙古科技大学土木工程学院;
【基金】：国家自然科学基金(41572276)
【分类号】：U455.4

【相似文献】