平面斜交联络通道水平冻结及实测分析

Horizontal Freezing and Measurement Analysis of Plane Oblique Connection Gallery

为解决常州地铁1号线翠竹站常州火车站区间隧道联络通道因预留钢管片错环造成联络通道平面斜交的问题,采用Z字型联络通道结构方案及平面斜交联络通道冻结加固方案,对冻结全过程进行温度与变形实测,分析其冻结温度场发展规律以及因冻胀引起的地表位移变化规律。得出以下结论:1)因加强冻结孔的加强作用,其变化规律与常规直交联络通道有所区别;2)下行线左侧外侧测温孔外部测点降温速率比内部测点快,而内侧测温孔内部测点降温速率比外部测点快,下行线右侧恰好相反;3)下行线左、右侧测温孔开挖时温度回升的测点分别为外部测点与内部测点;4)联络通道地表隆起最大值分布线亦倾斜,其最大倾角约为36.2°,与联络通道倾角相近。

The connection galleries of Cuizhu Station-Changzhou Railway Station of Changzhou Metro Line 1 obliquely intersect due to dislocation of reserved steel pipe.Hence,the Z-shaped connection gallery structure scheme and the plane oblique connection gallery freezing reinforcement scheme are adopted.And then the temperature and deformation during freezing are monitored,and the development law of the freezing temperature field and the variation law of surface displacement caused by frost heaving are analyzed.Some conclusions are drawn as follows:(1)The variation laws of temperature field and surface settlement are different from those of the conventional orthogonal connection gallery due to the effect of strengthened freezing holes.(2)The temperature drop rate of the external measurement point outside the left side of the down line is faster than that of the internal measurement point,while the temperature measurement rate of the internal measurement point inside the inner temperature measurement hole is higher than that of the external measurement point,and situation of the right side of the down line is just the contrary.(3)The measurement points of left side and right side of down line whose temperature rises during excavation are the external and internal measurement points respectively.(4)The distribution line of maximum surface elevation of the connection gallery is also inclined with a maximum inclination angle about 36.2°,which is close to that of the connection gallery.