深大基坑的土体试验性能分析及预警体系构建  

Analysis of soil test performance of deep and large foundation pit and construction of early warning system

作　　者：邹波 Zou Bo(Nanchang Construction Engineering Comprehensive Supervision Service Center,Nanchang 330038,China)

机构地区：[1]南昌市建设工程综合监督事务中心,南昌330038

出　　处：《黑龙江科技大学学报》2023年第6期902-908,共7页Journal of Heilongjiang University of Science And Technology

摘　　要：为有效掌握土体试验性能及其预警等级,结合基坑所处地质条件,通过抗剪试验分析其土体试验性能,结合基坑沉降变形监测数据,通过极限位移判据和变形速率判据开展基坑变形预警分析。结果表明:随孔隙比增加,结构土、重塑土的抗剪参数均具有减小特征,减小幅度存在差异,且黏聚力的减小幅度要大于内摩擦角的减小幅度;在基坑变形预警结果中,不同监测点在不同判据条件下的预警等级是不同的,DB-07及DB-23监测点的预警等级为Ⅲ级,DB-09及DB-21监测点的预警等级为Ⅱ级,按不利原则,基坑总体建议按Ⅲ级预警。This paper aims to effectively grasp the soil test performance and its warning level.The Study analyzes the soil test performance by shear tests combined with the geological conditions of the foundation pit;and analyzes the foundation pit deformation warning according to the limit displacement criteria and deformation rate criteria combined with the monitoring data of foundation pit settlement deformation.The results show that along with the increase of pore ratios comes the decreasing characteristic of shear parameters of both structural soil and remolded soil with differences only in reduce amplitude,with the more decrease in cohesion than that in internal friction angle.In the early warning results of foundation pit deformation,the early warning levels of different monitoring points are different under different criteria,shown by Level Ⅲ of the early warning levels of DB-07 and DB-23 monitoring points and Level Ⅱ of the early warning levels of DB-09 and DB-21 monitoring points.Based on unfavorable principle,Level Ⅲ is recommended to be the early warning for the foundation pit.

关 键 词：深基坑 抗剪试验 土体试验性能 极限位移 预警体系 

分 类 号：TU432[建筑科学—岩土工程]