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地处北纬44°04’~46°40’的哈尔滨地区冬季有6个月,但对该地区工程建设中的基坑开挖及其监测理论的研究较少,对于严寒地区跨越寒冷冬季基坑开挖技术的研究成果更是匮乏。通过对越冬施工的哈尔滨一基坑工程开挖监测的数据统计分析,归纳了坑壁变形特征并对坑壁护壁桩破损原因进行了探讨。锚杆轴力检测结果表明,基坑中间层锚杆轴力设计值偏大,具有一定的优化空间。基坑周边路面下沉,最大沉降值为8.2 mm,远小于警戒值25 mm;排桩最大水平位移为13.7 mm,远小于警戒值45 mm;锚杆轴力最大值127 k N,小于其锚杆轴力设计值。该基坑支护方案可行、整体稳定性良好。
The winter in Harbin, located at latitude 44o 04’-46o 40’N, is 6 months in winter. However, there are few studies on excavation and monitoring theory of foundation pit in engineering construction in this area. For the cold winter area, The research results of excavation technology is even more scarce. Through the statistical analysis of excavation monitoring data of a Harbin foundation pit construction overwintering, the deformation characteristics of the pit wall are summarized and the reasons for the damage of the pit wall piles are discussed. The test results of rock bolt axial force show that the design value of the axial force of the anchor rod in the middle pit of the foundation pit is too large and has certain space for optimization. The maximum settlement is 8.2 mm, much less than the warning value 25 mm; the maximum horizontal displacement of the pile is 13.7 mm, far less than the warning value 45 mm; the maximum axial force of the anchor bolt is 127 kN, less than its anchor Rod axial force design value. The foundation pit support scheme is feasible and the overall stability is good.