深基坑围护墙体最大水平位移所在位置研究

利用南京地铁夫子庙站深基坑的实测数据,结合平面有限元软件plaxis对比分析研究,发现基坑围护结构的自身刚度以及地下各土层土质情况是决定墙体水平位移最大值所在位置的两个主要因素.研究表明,在一定范围内,围护墙体最大水平位移所在位置随着其自身刚度的增大而逐渐下移;距离基底较远的土层强度变化对围护墙体最大水平位移位置基本没有影响,对于距离基底较近的土层,则有以下规律：位于基底以上的土层,围护墙体最大水平位移所在位置随着该土层强度的增大而下移,位于基底以下的土层则正好相反,并且位于基底以下的土层的这种影响能力要大于基底以上的土层,此外距离基底越远的土层对于围护墙最大水平位移所在位置的影响力越强,影响范围越大.

Research on Location of the Maximum Deformation of the Retaining Structure of Deep Foundation Pit

The measured data from Confucius Temple in Nanjing Metro Line station deep foundation combined with the plane finite element analysis software plaxis comparative analysis indicate that the underground retaining wall stiffness and the underground soil properties are the two main factors to determine the location of the maximum horizontal displacement. Studies show that in a certain range,the location of the maximum horizontal displacement of the retaining wall gradually sinks with its own stiffness increases. Intensity changes from the pit bottom soil far away has no effect on the position of maximum horizontal displacement of the retaining wall. Above the pit bottom soil,the position of maximum horizontal displacement of retaining wall moves downward with the increase in soil strength. Below the pit bottom soil,the trend is just the opposite. Moreover,this effect capability of soils located below the pit bottom is greater than the one above the pit bottom. In addition,the soil farther away the pit bottom soil has a stronger influence and greater sphere of influence than the one near the pit bottom.