盾构施工扰动对隧道结构弹性沉降的影响
发布时间：2018-10-16 13:16
【摘要】：为探索盾构施工扰动对隧道弹性沉降影响的估算方法,需估计隧道最终沉降。以某地铁为背景,基于Winkler弹性地基梁理论,同时考虑土的扰动程度,得到土体扰动度与隧道弹性沉降的关系;考虑隧道上覆荷载、土体初始变形模量及隧道弯曲刚度不同取值对隧道弹性沉降进行修正;然后基于某地铁8年的监测数据,半定性半定量地分析了扰动度、地质条件、上覆荷载对隧道沉降的影响,并考察了弹性沉降占总沉降的比例,及不同地质条件、上覆荷载情况下扰动度的分布范围。研究表明:隧道弹性沉降量与隧道上覆荷载成正比;与土体初始变形模量呈幂函数关系;与土体扰动度D呈指数关系;这3个因素相互关联,地质条件好、上覆荷载小的区域往往施工扰动小,地质条件很差、上覆荷载很大的区域往往施工扰动大;粗略估计,隧道弹性沉降约占总沉降量的20%;该地铁施工扰动度一般在0.2~0.5,地质条件较好且上覆荷载较小的地区,扰动度大概在0.2~0.3;对于地质条件较大且上覆荷载较大的区域,扰动度大概在0.4~0.5;选择上覆荷载较小、地质条件较好的地段,比较容易将扰动度D控制在较小的范围内,可明显减小对隧道弹性沉降及最终沉降。
[Abstract]:In order to explore the method of estimating the influence of shield construction disturbance on tunnel elastic settlement, it is necessary to estimate the final settlement of tunnel. Based on the theory of Winkler elastic foundation beam and considering the disturbance degree of soil, the relation between soil disturbance degree and tunnel elastic settlement is obtained, and the overlying load of tunnel is considered. The initial deformation modulus of soil and the different values of the bending stiffness of the tunnel are corrected for the elastic settlement of the tunnel, and based on the monitoring data of a subway for 8 years, the disturbance degree and geological conditions are analyzed semi-qualitatively and semi-quantitatively. The influence of overburden load on the settlement of tunnel is studied. The proportion of elastic settlement to total settlement and the distribution range of disturbance degree under overlying load are investigated under different geological conditions. The results show that the elastic settlement of the tunnel is proportional to the overburden load on the tunnel; it has a power function relationship with the initial deformation modulus of soil; an exponential relationship with the disturbance degree D of the soil mass; the three factors are related to each other and the geological conditions are good. The area with small overburden often has small construction disturbance and poor geological conditions, and the area with high overburden often has large construction disturbance. The elastic settlement of the tunnel accounts for about 20% of the total settlement, and the disturbance degree of the subway construction is generally 0.2% 0.5, and the disturbance degree is about 0.2% 0.3 in the areas with better geological conditions and less overburden. The disturbance degree is about 0. 4 ~ 0. 5. If the overlying load is small and the geological condition is better, it is easier to control the disturbance D in a smaller range, which can obviously reduce the elastic settlement and final settlement of the tunnel.
【作者单位】： 上海地铁咨询监理科技有限公司;昆明理工大学土木工程学院;
【基金】：昆明理工大学人才培养基金(KKSY201206020)
【分类号】：U455.43
[Abstract]:In order to explore the method of estimating the influence of shield construction disturbance on tunnel elastic settlement, it is necessary to estimate the final settlement of tunnel. Based on the theory of Winkler elastic foundation beam and considering the disturbance degree of soil, the relation between soil disturbance degree and tunnel elastic settlement is obtained, and the overlying load of tunnel is considered. The initial deformation modulus of soil and the different values of the bending stiffness of the tunnel are corrected for the elastic settlement of the tunnel, and based on the monitoring data of a subway for 8 years, the disturbance degree and geological conditions are analyzed semi-qualitatively and semi-quantitatively. The influence of overburden load on the settlement of tunnel is studied. The proportion of elastic settlement to total settlement and the distribution range of disturbance degree under overlying load are investigated under different geological conditions. The results show that the elastic settlement of the tunnel is proportional to the overburden load on the tunnel; it has a power function relationship with the initial deformation modulus of soil; an exponential relationship with the disturbance degree D of the soil mass; the three factors are related to each other and the geological conditions are good. The area with small overburden often has small construction disturbance and poor geological conditions, and the area with high overburden often has large construction disturbance. The elastic settlement of the tunnel accounts for about 20% of the total settlement, and the disturbance degree of the subway construction is generally 0.2% 0.5, and the disturbance degree is about 0.2% 0.3 in the areas with better geological conditions and less overburden. The disturbance degree is about 0. 4 ~ 0. 5. If the overlying load is small and the geological condition is better, it is easier to control the disturbance D in a smaller range, which can obviously reduce the elastic settlement and final settlement of the tunnel.
【作者单位】： 上海地铁咨询监理科技有限公司;昆明理工大学土木工程学院;
【基金】：昆明理工大学人才培养基金(KKSY201206020)
【分类号】：U455.43
【参考文献】
相关期刊论文 前3条
1 马险峰;余龙;李向红;;不同下卧层盾构隧道长期沉降离心模型试验[J];地下空间与工程学报;2010年01期
2 黄腾;孙景领;陶建岳;黄昱e，
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