盾构过地铁站施工对地表沉降影响的数值模拟

采用FLAC^3D软件，以拟建的广州地铁3^#线典型车站为例，对盾构过站，扩挖成站施工引起的地表沉降规律进行了数值模拟，研究了不同工况盾构双隧道过站施工对地面带来的影响；并在此基础上采取不同加固土体措施情况下，模拟了扩挖建站对地面变形的影响程度．研究结果对盾构直接过站方案是一种技术支持，作为盾构过站施工对地表沉降影响预测的方法，可为我国盾构法技术的扩大应用提供部分理论依据和参考．

Numerical Simulation of Ground Settlement due to Constructing Metro-Station Based on Shield Tunneling

According to the typical metro\|station of the Guangzhou metro line 3 # to be constructed, the FLAC 3D codes was adopted and the numerical simulation of the ground settlement due to expanding metro\|station on the basis of shield\|constructed tunnels was presented. The influence on ground settlement due to the two\|tunnel shielding construction in different construct methods was also simulated. Finally, the range of the ground settlement as a result of expanding metro\|station was studied when using different reinforcement measures. This investigation is a technique support for constructing the metro\|stations by expanding shielding tunnels directly and provides a method to predict the ground movement. It will also undoubtedly offer theoretical reference for promoting the shielding construction.