基于地质区划下地铁盾构引起的建筑物沉降预测

发布时间：2019-04-29 07:39

【摘要】：城市地铁盾构隧道掘进会造成邻近建筑物发生结构变形及沉降。由于不同建筑物所处位置各异,盾构隧道穿越土体的上覆土厚度、岩层组合、地下水埋深等情况不一,因此,建筑物沉降规律存在较大的差异。文中基于南宁市水文地质条件、岩层组合模型及工程结构特征等因素对地铁盾构施工区间线路进行地质分区。根据盾构隧道施工引起的建筑物沉降曲线基本符合高斯分布的特点,结合建筑物的基础埋深、刚度、与隧道的相对位置等因素,对地表沉降Peck公式的地层参数进行修正,得到不同地质分区建筑物沉降预测公式。以南宁地铁一号线某区间为实例,将建筑物沉降预测公式计算值与实际监测值进行对比,结果表明两者拟合相关系数为82%,说明公式具有良好的适用性,可为南宁市地铁后续线路邻近建筑物沉降预测提供参考。
[Abstract]:Tunneling of shield tunnel in urban subway will cause structural deformation and settlement of adjacent buildings. Because the location of different buildings is different, the thickness of overlying soil, the combination of rock strata and the depth of underground water are different in shield tunnel, so there are great differences in the rules of building settlement. Based on the hydrogeological conditions, rock formation combination model and engineering structure characteristics of Nanning city, the geological zoning of subway shield construction interval is carried out in this paper. According to the characteristics of the settlement curve of buildings caused by shield tunnel construction basically accord with Gao Si's distribution, combined with the factors of foundation buried depth, stiffness, relative position of tunnel and so on, the stratum parameters of Peck formula for surface settlement are modified. The formulas for predicting the settlement of buildings in different geological zones are obtained. Taking a certain section of Nanning Metro Line 1 as an example, the calculated value of building settlement prediction formula is compared with the actual monitoring value. The results show that the fitting correlation coefficient between them is 82%, indicating that the formula has good applicability. It can be used as a reference for predicting the settlement of buildings adjacent to the follow-up subway line in Nanning City.
【作者单位】：广西大学土木建筑工程学院;南宁市建筑管理处;桂林理工大学广西岩土力学与工程重点实验室;
【基金】：国家自然科学基金资助(51568006,41372361) 广西岩土力学与工程重点实验室资助课题(14-KF-03)
【分类号】：U455.43;U231.3

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