地铁施工诱发地表最大沉降量估算及规律分析

发布时间：2018-03-24 05:23

本文选题：土力学　切入点：地铁施工　出处：《岩石力学与工程学报》2017年S1期

【摘要】：本文系统综述5大类地铁施工诱发地表最大沉降量S_(max)的预测公式及其适用性,并以大量的国内地铁实测沉降资料为依据,总结地铁在不同覆跨比H/D、不同地层条件和不同施工方法下的S_(max)、沉降槽宽系数k、地层损失率V_l及间隙参数g的变化规律及其经验关系。结果表明:(1)经验法需要归纳大量监测成果来预测S_(max);解析方法多适用于地层条件相对单一的施工期不排水条件下沉降估算;半经验公式存在较大的地区性差异;(2)S_(max)主要与地铁所处的一般性地层条件(为了保护临近重要建(构)筑物而采取辅助施工措施来超前加固地层的特殊情况除外)、覆跨比H/D、施工方法等因素有关,其中S_(max)与H/D呈反相关,不同地层条件下盾构法(土压、泥水)施工所诱发的S_(max)平均值为-11.5~-31.3 mm,浅埋暗挖法下S_(max)离散性较大,其平均为-13.0~-41.6 mm,表明在控制地表沉降方面盾构法较优于浅埋暗挖法;(3)不同地层和H/D条件下S_(max)=(-0.28~-0.71)g,S_(max)/g和H/D关系可采用修正Atkinson公式(α=0.15~0.28)及Clough公式(β=-0.55~-1.11)来描述。通过本文系统的总结分析,可相对全面地了解城市地铁施工诱发S_(max)的预测方法及其各自的适用性,为后期类似地铁工程施工诱发地表沉降的准确预测提供科学参考。
[Abstract]:In this paper, the prediction formulas and their applicability of the maximum ground subsidence induced by the construction of 5 kinds of subways are systematically summarized, and based on a large number of measured settlement data of domestic subways, This paper sums up the variation law and empirical relationship of the subways under different overburden ratio H / D, different formation conditions and different construction methods, the coefficient of settlement slot width k, the formation loss rate V l and the clearance parameter g. The results show that the empirical method needs to be summed up. A large number of monitoring results are used to predict SIV max.Analytical methods are mostly applicable to the settlement estimation under undrained conditions under relatively single formation conditions. There is a large regional difference between the semi-empirical formula and the general formation conditions of the subway (except for special cases where auxiliary construction measures are taken to protect adjacent important buildings to reinforce the strata ahead of time. Covering span ratio H / D, construction method and other factors, The average value of the shield method (soil pressure, mud water) induced by the construction of the shield method is -11.5 ~ 31.3 mm, and under the method of shallow burying and digging, there is a greater dispersion of Stix _ max.There is a negative correlation between SSP _ max _ D and H _ / D, and the average value of the shield method (earth pressure, mud water) is -11.5 ~ (-31.3) mm. The average value is -13.0 ~ 41.6 mm, which indicates that the shield method is better than the shallow burying tunneling method in controlling the surface subsidence. Under the condition of H / D and H / D, the relationship between Smax-0.28- 0.71g and H / D can be described by the modified Atkinson formula (伪 -0.150.28) and the Clough formula (尾 -0.55 ~ 1.11). The prediction methods and their respective applicability of SSP _ max induced by urban subway construction can be comparatively comprehensively understood, which provides a scientific reference for the accurate prediction of surface subsidence induced by similar subway construction in the later period.
【作者单位】：西安理工大学岩土工程研究所;
【基金】：国家自然科学基金资助项目(51678484) 西安理工大学陕西省黄土力学与工程重点实验室科研计划项目(16JS073)~~
【分类号】：P642.26;U231.3

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