某工程重力式挡土墙开裂变形监测与稳定性分析  

Cracking deformation monitoring and stability analysis of a gravity retaining wall

作　　者：何飞 穆锐 韩力 He Fei;Mu Rui;Han Li(Guizhou Zhongjian Architectural Research and Design Institute Co.,Ltd.,Guiyang 550006,China;Army Logistics Academy of PLA,Chongqing 401331,China)

机构地区：[1]贵州中建建筑科研设计院有限公司,贵阳550006 [2]陆军勤务学院,重庆401331

出　　处：《工程勘察》2025年第4期1-7,23,共8页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金资助项目(51608141);贵州省科学技术厅社发基金资助项目(黔科合SY字[2014]3067号);陆军勤务学院科研创新团队项目(X205071306)。

摘　　要：为研究已建挡土墙的开裂变形监测与稳定性分析方法,本文以已建工程挡土墙为例,根据挡土墙的勘察、设计、施工资料以及现场踏勘基本情况制定了挡土墙开裂变形监测方案,并对监测区域最不利挡土墙的稳定性进行综合分析与评价。结果表明:在深度0.0~15.0m范围内,监测区域挡土墙地基基础面波速度约130~1150m/s,在深度0.0~10.0m范围内面波速度约130~730m/s,且地质特征显示地基表层局部存在相对软弱带;监测区域挡土墙的砌筑毛石抗压强度为20.1~100.5MPa, 95%毛石强度达到了规范不应低于MU30的要求,但监测区挡土墙的砌筑砂浆抗压强度为1.0~11.5MPa,除个别挡土墙外,均达不到规范不应低于M5的要求;挡土墙存在倾斜状、水平状裂缝,其最大宽度在3~5cm范围内,且局部存在渗水现象;挡土墙的水平位移在监测期内的累计变形值在1.9~3.5mm范围内,变化速率v_D在0.008~0.015mm/d范围内;挡土墙稳定性验算结果表明监测区内挡土墙的抗滑移稳定性系数小于0.87F_s、基础底面边缘的最大压力值p_(kmax)>1.2f_(a)、基底合力偏心距验算不满足规范要求。鉴于此,文末对监测区域内的挡土墙稳定性进行综合分析并给出处理建议,研究结果可为类似已建挡土墙的稳定性鉴定分析提供参考依据。In order to study the cracked deformation monitoring and stability analysis method of the existed retaining wall,a case study was carried out.The deformation monitoring program of the retaining wall was proposed based on the information of investigation,design,construction records and in-situ inspection.An comprehensive stability analysis was carried out of the most dangerous section.The results show that in the range of depth 0.0~15.0m,the surface wave velocity of the wall base is about 130~1150m/s,and the surface velocity in the range of depth 0.0~10.0m is about 130~730m/s,and there is a relatively weak zone locally in the surface layer of the foundation;the masonry rock compressive strength of the retaining wall varies from 20.1MPa to 100.5MPa,with 95 percent of the strengths meets the code requirement of MU30;however,the masonry mortar compressive strengths ranges from 1.0MPa to 11.5MPa,except for a few retaining walls,none of them meet the code requirement of M5;there are inclined and horizontal cracks in the retaining wall,with the maximum width ranging 3~5cm,and water seepage exists locally;the cumulative value of horizontal displacement during the monitoring period ranges from 1.9mm to 3.5mm,and the rate of changing vD ranges from 0.008mm/d to 0.015mm/d.The stability analysis shows that the stability coefficient in the monitoring area is less than 0.87 F_(s),and the maximal pressure below the wall base footing is larger than 1.2f_(a),and the eccentricity of the force is not satisfy with the requirements of the specification.A comprehensive analysis on the stability of the retaining wall is performed and remedial recommendations are proposed.The study results could be referred by the similar projects.

关 键 词：重力式挡土墙 监测 材料强度 水平位移 稳定性分析 

分 类 号：TU413.6[建筑科学—岩土工程]