滁州至南京城际铁路某深基坑变形监测及数据分析

Deformation monitoring and data analysis of a deep foundation pit on the Chuzhou-Nanjing Intercity Railway

针对滁州地区地质条件,结合滁宁城际铁路某深基坑无止水及降水措施实际,通过优化监测方案,及时准确地对基坑进行了预警,确保了施工安全。通过对相关监测数据的分析,得出一些有价值的结论。监测数据表明,桩体深层水平位移最大值大致位于基坑开挖深度0.7倍处;桩体深层水平位移、地下水位与地表沉降关系较为密切;混凝土支撑截面4个角点所测应力差值较大,因此在截面4个角点设置应力计取平均值十分必要。

In view of the geological conditions of Chuzhou area,combined with the actual no water stop and precipitation measures of a deep foundation pit of the Chuzhou-Nanjing(Chuning)Intercity Railway,through optimizing the monitoring plan,timely and accurate early warning of the foundation pit was carried out to ensure the safety of construction.Through the analysis of relevant monitoring data,some valuable conclusions were drawn.Monitoring data showed that the maximum value of the deep horizontal displacement of the pile was approximately 0.7 times the excavation depth of the foundation pit;the deep horizontal displacement of the pile,the groundwater level and the surface settlement were closely related;the measured stress difference at the 4 corners of the concrete support section was relatively large,which shown it was necessary to set the stress meter at the 4 corners of the section to take the average deformation.