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以广州地铁某盾构区间为工程背景,研究分析浅埋段盾构侧穿房屋时的控制措施及沉降机理。主要结论如下:(1)在盾构通过前,预先对房屋地基进行处理,进行地基土改良,能较好地起到隔水及增强土体稳定性的作用;(2)在施工过程中做好各类数据采集,如出渣量、实时沉降等,经处理分析能较真实地反映目前施工状态,并可及时进行相应的措施调整;(3)在盾构掘进过程中,维持各项参数的稳定性及匹配,是安全快速掘进的基础;(4)由于设备自身原因及地质条件的复杂性,盾构掘进会不可避免地造成土体变形沉降;(5)采用同步注浆及壁后注浆相结合的方式,可有效控制地面及房屋的沉降范围;(6)由于盾构环形空间的存在、浆液凝固时间的时效性,地面沉降主要产生在盾构通过时及通过后;(7)由于房屋基础的整体性限制,房屋沉降主要为盾构通过后的后续累积沉降;(8)沉降的分布方式符合Peck理论的预测。
Based on the engineering background of a shield in Guangzhou Metro, the control measures and settlement mechanism of the shield tunnel in the shallow section are studied. The main conclusions are as follows: (1) Prior to the passage of the shield, pre-treatment of the foundation of the house to improve the foundation soil can better play the role of water isolation and soil stability enhancement; (2) During the construction process Good all kinds of data collection, such as the amount of slag, real-time settlement, the treatment analysis can more accurately reflect the current state of construction, and timely adjustments to the corresponding measures; (3) in the shield tunneling process, to maintain the parameters (4) Due to the complexity of the equipment itself and geological conditions, shield tunneling will inevitably cause deformation of the soil settlement; (5) The use of synchronous grouting and the wall behind (6) Due to the existence of shield annular space and the timeliness of slurry solidification time, land subsidence mainly occurs when the shield passes and after it passes through; (7) ) Due to the overall limitation of the foundation of the house, the settlement of the house is mainly the follow-up cumulative settlement after the shield passes. (8) The distribution of settlement accords with the prediction of Peck theory.