本文是1966年写的,由于本刊停刊而未发表,至今虽已相隔较长时间,但从內容上看,该文根据现場实际调查的资料,对检查坑、灰坑裂縫的产生原因,从理论上进行了分析和计算,并提出了改进意见。因此,有一定参考价值,经本刊编辑组修改后发表,以供参考。 This article was written in 1966 and published as unpublished publication has not yet been published, although a long time ago, but from the content point of view, according to the actual field investigation of the information on the inspection pit, crater cracks cause, From the theoretical analysis and calculation, and put forward suggestions for improvement. Therefore, there is a certain reference value, edited by the editorial team published for reference.