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以某明挖隧道深基坑的组合支撑轴力、地表沉降、墙体水平位移、水土压力等施工监测数据为依据,探讨了组合支撑轴力、地表沉降、墙体水平位移等的变化规律。结果表明:围护结构外沉降量与离基坑的距离有一定的关系;深基坑开挖时应考虑时空效应及土的流变特性,在基坑开挖前应做好支撑工作,以围护基坑的稳定性;围护结构变形呈抛物线型,基坑顶部和底部变形较小,基坑的中部变形较大的原因可能是深基坑的第一道支撑接近地表,监测数据是在第一道支撑完成后才开始测量,且地下连续墙入土较深或地下连续墙下层土体较结实,底部墙体位移受到制约。
Based on the monitoring data of combined supporting axial force, surface settlement, horizontal displacement of wall, water and soil pressure in deep excavation of a Ming tunnel, the variation regularity of combined support axial force, surface settlement and horizontal displacement of the wall were discussed. The results show that there is a certain relationship between the external settlement and the distance from the foundation pit. The time-space effect and soil rheological properties should be considered when excavation of deep foundation pit. The stability of the retaining foundation pit; the deformation of the retaining structure is parabolic, the deformation of the top and bottom of the foundation pit is small, and the deformation of the middle part of the foundation pit may be caused by the fact that the first support of the deep foundation pit is close to the surface and the monitoring data is The measurement of the first support is completed, and the underground continuous wall is deeply buried or the soil underneath the continuous diaphragm wall is strong, and the displacement of the bottom wall is restricted.