原位支撑保护下埋地箱涵支撑点间距计算方法  

Calculation method for support distance determination under in-situ protection of buried box culverts

作　　者：邓声君 胡东 刘恒[1] 付丽 林洹宇 蒋刚[1] DENG Shengjun;HU Dong;LIU Heng;FU Li;LIN Huanyu;JIANG Gang(Department of Underground Engineering,Nanjing Tech University,Nanjing 211816,P.R.China;Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,P.R.China)

机构地区：[1]南京工业大学地下工程系,南京211816 [2]浙江大学滨海和城市岩土工程研究中心,杭州310058

出　　处：《土木与环境工程学报(中英文)》2025年第2期107-115,共9页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(52008208、51308292);江苏省自然科学基金(BK20200707);江苏省高等学校自然科学研究面上项目(20KJB560029);软弱土与环境土工教育部重点实验室(浙江大学)开放基金(2020P04)。

摘　　要：地下电力管线常以箱涵包裹的形式埋于土体,当地下工程施工涉及此类既有管线时,一般采用原位支撑保护法确保箱涵在施工过程中的稳定性,目前,支撑保护法中支撑点间距的确定主要依赖工程经验。考虑箱涵截面属性以及在土中的沉降效应,分别建立箱涵中跨段和端部的力学模型,计算箱涵竖向位移,推导支撑点容许最大间距值,提出原位支撑保护下埋地箱涵支撑点间距计算方法,以南京地铁五号线云南路站大直径管涵原位保护工程实例验证该计算方法的准确性和工程适用性,并通过数值模拟进一步分析埋地箱涵全跨纵向变形规律和参数敏感性。研究表明:箱涵边跨段支撑点间距为8 m,中跨段间距为8.73 m,全跨总计至少需要设置12个支撑点;在参数放大3倍范围内,随着加固深度、宽度、土体压缩模量的增加,箱涵位移逐渐变小。Underground power pipelines are generally buried in the soil in the form of box culverts.When such existing pipelines are involved in underground construction,the in-situ support protection method is generally used to ensure the stability of the box culvert during the construction process.The determination of the distance between the support points mainly depends on the engineering experience.In this paper,considering the cross-sectional properties of the box culvert and the settlement effect in the soil,the mechanical models of the middle-span and the side-span of the box culvert are respectively established,the vertical displacement of the box culvert is calculated,and the allowable support points are deduced.Based on the maximum spacing value,a calculation method for the spacing between the support points of buried box culverts under in-situ support protection is proposed,and the accuracy and engineering suitability of the calculation method are verified by a case of the in-situ protection project of large-diameter pipe culverts at Yunnan Road Station of Nanjing Metro Line No.5.The full-span longitudinal deformation pattern and parameter sensitivity of the buried box culvert are further analyzed through numerical simulation.The research shows that:the spacing between the supporting points of the box culvert side span is 8 m,the spacing of the middle span is 8.73 m,and at least 12 supporting points need to be set for the whole span.Within the range of three times of parameter magnification,with increase of reinforcement depth,width and soil compressive modulus,the displacement of the box culvert gradually decreases.

关 键 词：埋地箱涵 支撑保护法 箱涵变形 支撑点间距 土体加固 

分 类 号：TU990.3[建筑科学—市政工程]