大断面管幕箱涵顶进引起地表变形的解析解答  

Analytical solutions for surface deformation induced by jacking large-section pipe curtain box culvert

作　　者：张坤勇[1,2] 李丹阳 张梦 沈小锐 ZHANG Kunyong;LI Danyang;ZHANG Meng;SHEN Xiaorui(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China;Institute of Geotechnical Engineering,Hohai University,Nanjing 210024,China;Nanjing Housing Safety Service Center,Nanjing 210029,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210024 [2]河海大学岩土工程科学研究所,江苏南京210024 [3]南京市房屋安全服务中心,江苏南京210029

出　　处：《岩土工程学报》2025年第1期184-191,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金重点项目(41530637)。

摘　　要：研究大断面管幕箱涵顶进全过程对土体变形和周围环境的影响,对于事前预测变形并控制施工扰动影响具有重要意义。基于Mindlin解答、修正Sagaseta公式等经典理论解答,分别考虑由正面推进力、摩擦力和土体损失等因素引起的地表变形,提出考虑三者共同作用下的大断面管幕箱涵顶进引起的地表变形计算方法。建立管幕箱涵顶进作用下土体受力模型,采用Mindlin解答分别给出正面推进力和摩擦力引起的土体变形计算公式;基于当层法原理提出由土体损失引起的横向地表沉降计算公式。根据各影响因素的相对独立性,将各因素引起的土体变形量叠加,从而得到一种适用于大断面管幕箱涵顶进施工,可综合考虑多种施工因素和土体三维变形的理论解答公式。通过工程实例验证公式的合理性,研究成果可为实际施工变形预测提供参考。It is of great significance to study the influences of the whole jacking process of a curtain box culvert on soil deformation and surrounding environment in advance to predict the deformation and control the influences of construction disturbance.A method for calculating the surface deformation under the combined action of front propulsion,friction and soil loss is obtained based on the classical theoretical solutions such as the Mindlin solution and revised Sagaseta formula.The mechanical model for soils under the jacking process of the curtain box culvert is established,and the formula for the soil deformation caused by the front propulsion force and friction force is given based on the Mindlin solution.The formula for the lateral surface settlement caused by the soil loss is proposed based on the principle of the equivalent layer method.According to the relative independence of each influencing factor,the deformation caused by each factor is superimposed to obtain a theoretical solution formula suitable for jacking of the large-section pipe curtain box culvert,which can comprehensively consider a variety of construction factors and three-dimensional deformation of soils.The rationality of the formula is verified through engineering examples,and the research results can provide references for the deformation prediction of actual construction.

关 键 词：大断面管幕箱涵 MINDLIN解 地表变形 变形预测 

分 类 号：TU411[建筑科学—岩土工程]