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作 者:付顺康 潘大荣[2] FU Shunkang;PAN Darong(Chongqing Jiaotong University,Chongqing 400074;Nanjing Institute of Technology,Nanjing 211167)
机构地区:[1]重庆交通大学,重庆400074 [2]南京工程学院,南京211167
出 处:《土工基础》2023年第4期629-634,共6页Soil Engineering and Foundation
摘 要:盾构下穿时因各种施工影响会导致既有箱涵变形过大进而引起开裂。为分析盾构下穿时既有箱涵的变形规律及其与裂缝产生的相互关系,以常州2号线某标段为背景,采用有限元法对盾构下穿既有矩形箱涵全过程进行模拟,结合现场监测数据与箱涵开裂情况,并考虑注浆量、土仓压力、摩擦力等施工参数对变形与开裂的影响。结果表明:随着盾构隧道开挖,既有箱涵处于偏压状态,进而导致箱涵产生差异性沉降并向掘进方向位移,而裂缝的出现与第一主应力应力集中相关,由掘进方向位移与沉降二者控制;二次注浆对竖向位移影响最大,随着二次注浆范围的增大,竖向沉降可减少84.3%,摩擦力其掘进方向位移影响最大,随着摩擦力的增加,掘进方向位移可增大55%,土仓压力的增加会降低其竖向位移而增大掘进方向位移。Due to various construction effects,the existing box culvert will have excessive deformation and cracking when a shielded tunnel boring machine(TBM)passes through.To analyze the deformation pattern of the existing box culvert and its relationship with the cracking when the TBM passes underneath,this paper presents a section of Changzhou Line 2 a case history.The finite element method was used to simulate the entire process of the shielded tunnel excavation passing through the existing box culvert with the on-site monitoring data and the cracking observation of the box culvert.The numerical analysis also considers the effects of construction parameters such as grouting amount,soil pressure and friction on the deformation and cracking.The results show that the cracks are controlled by the displacement in the excavation direction and the vertical displacement.The secondary grouting range has the greatest influence on the vertical displacement,and with the increase of the secondary grouting range,the settlement decreases by 84.3%;The friction has the greatest influence on the displacement in the excavation direction,and with the increase of friction,the displacement in the excavation direction can increase by 55%;The increase of soil pressure will decrease its vertical displacement,and then increase the displacement in the excavation direction.
分 类 号:U456[建筑科学—桥梁与隧道工程]
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