论文部分内容阅读
随着地下工程施工方法的日益丰富,越来越多的在建工程在确定施工方法时考虑的不仅是施工的安全性,而且还应具有对周围建筑物影响小,对管线、地表沉降控制较好等优点。近年来PBA工法被许多在建工程广泛应用,本文基于北京地铁七号线双井站与九龙山站的土层分布情况以及工程施工现状,针对PBA工法中导洞开挖采取的步序进行FLAC3D数值模拟,分别考虑先上后下、先下后上、先中间后两边等3种开挖方法,将所得的沉降值与实际工程中的数据相对比,最终得到导洞“先下后上,先两边后中间”的开挖方法能有效控制地表沉降。结论对于实际工程的建设具有一定的参考意义。
With the increasingly rich underground construction methods, more and more construction in progress in determining the construction method to consider not only the safety of construction, but also has a small impact on the surrounding buildings, control of the pipeline, surface subsidence Good and so on. In recent years, PBA method has been widely used in many construction projects. Based on the distribution of soil layers in Shuangjing Station and Jiulongshan Station on the 7th line of Beijing Subway and the status of construction, the PBA method was used to conduct FLAC3D Simulation, respectively, consider first after the next, first after the next, after the middle of the two sides of the three kinds of excavation methods, the resulting settlement value compared with the actual project data, and finally get the lead hole After the first two sides of the middle "excavation method can effectively control the surface subsidence. Conclusion has certain reference meaning for the construction of actual project.