一、引言随着城市绿化面积的不断扩大,有些绿化树木生长在排水管道的上方。加之管道接口不严,树根往往会通过排水管顶的接口处向管道内延伸。由于受到管道内充足水份和温度的影响,其根须生长得特别稠密,这样 I. INTRODUCTION As the greening area of ​​the city continues to expand, some greening trees grow above the drainage pipelines. Coupled with the lax pipeline interface, roots often through the drain at the top of the interface to the extension of the pipeline. Due to the pipe being full of moisture and temperature, its roots must grow particularly dense, so