水平掏土纠倾孔周卸荷响应与破坏模式研究  

Study on unloading response and failure mode around horizontalexcavation hole for building rectification

作　　者：肖俊华[1,2] 杨凡 高翔[1,2] 刘国辉 孙剑平[1,2] XIAO Junhua;YANG Fan;GAO Xiang;LIU Guohui;SUN Jianping(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering(Shandong Jianzhu University),Ministry of Education,Jinan 250101,China;Shandong Jianzhu University Engineering Appraisal and Strengthening Design Co.,Ltd.,Jinan 250014,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101 [2]山东建筑大学建筑结构加固与地下空间工程教育部重点实验室,山东济南250101 [3]山东建大工程鉴定加固设计有限公司,山东济南250014

出　　处：《山东建筑大学学报》2025年第2期11-19,共9页Journal of Shandong Jianzhu University

基　　金：国家自然科学基金重点项目(52038006);山东建筑大学工程鉴定加固研究院有限公司校企联合横向课题(H19228Z,H19233Z)。

摘　　要：建筑物倾斜后常采用水平掏土纠倾技术,但掏土孔周围的应力场和位移场特征难以通过实测进行连续精确地刻画,同时对孔周土体的破坏模式研究非常匮乏。文章将水平掏土简化为平面应变问题,运用有限元方法研究小孔周围的卸荷响应,揭示掏土的纠倾机理。结果表明:掏土引起孔周应力重分布,小孔上、下方的竖向应力减小,而孔间土条的竖向应力增加,并随孔间距的减小,应力重分布显著;孔周位移以向孔内卸荷回弹为主,土条中间为应力集中引起的压缩变形;基底处变形主要产生于掏土孔以上的土层厚度内,其变形量远小于工程实测值;小孔周围产生X形剪切破坏,并最终在掏土孔水平面处贯通;随着掏土孔间距的减小,孔周塑性破坏区会因应力重分布而不断变化。Building inclination is commonly rectified using horizontal excavation techniques.However,the stress and displacement fields around small holes are challenging to continuously and accurately characterize through field measurements,and research on the failure modes of surrounding soil remains scarce.This study simplifies horizontal excavation as a plane strain problem and employs finite element methods to investigate the unloading response around small holes,thereby elucidating the rectification mechanism.The results demonstrate that hole-digging induces stress redistribution in the surrounding soil:vertical stresses above and below the holes decrease,while vertical stresses in the soil strips between adjacent holes increase.This stress redistribution intensifies with reduced hole spacing.Displacements near the holes are dominated by inward elastic rebound,whereas the central regions of soil strips exhibit compressive deformation due to stress concentration.Deformation at the foundation base primarily occurs within the soil layer above the holes,with magnitudes significantly smaller than field-measured values.X-shaped shear failure develops around the holes and ultimately connects along the horizontal plane of the excavation.As hole spacing decreases,the plastic failure zones surrounding the holes continuously evolve due to stress redistribution.

关 键 词：水平掏土 卸荷响应 应力重分布 破坏模式 

分 类 号：TU431[建筑科学—岩土工程] TU311.2[建筑科学—土工工程]