Abstract:

Taking the shield construction between Lu channel station and Shuanggang station of Tianjin Metro Line 6 as the background, the aim is to control the non-uniform settlement of the geological shield in water-rich sand layer through the building continuously. By using finite difference software is used for numerical simulation, this paper analyzes the non-uniform settlement force caused by shield tunneling through buildings, and provides theoretical guidance for the construction, analysis and determination of the building under the shield tunneling parameters of the accurate value range. Through the analysis of numerical simulation and actual monitoring data, the shield under the building will produce uneven settlement, but reasonable construction measures will not cause large damage to the building; In order to control the settlement and ensure the safety of the building, it is necessary to reinforce the weak parts of the building and the interval tunnel by grouting.

Key words:  shield machine, building, confined water, sand layer

摘要：

以天津地铁6号线渌水道站—双港站区间盾构法施工为背景，以控制富水砂层中盾构连续穿越建筑物导致的不均匀沉降为目的，采用有限差分软件进行数值模拟，分析盾构侧穿或下穿建筑物时产生不均匀沉降的受力情况，为施工提供理论指导；结合盾构穿越后一段时期地表和建筑物的沉降监测值，分析确定下穿该段建筑物的盾构掘进参数的准确取值范围。经数值模拟和实际监测数据分析，盾构下穿建筑物会产生不均匀沉降，但经过采取合理的施工措施未造成建筑物较大破损；在监测数据支持下，为控制沉降保证建筑物安全需要对建筑物及区间隧道薄弱部位进行地表、洞内、双液稳定性注浆加固，并提出了各项注浆加固参数。

关键词:  盾构, 建筑物, 承压水, 砂层