Abstract:The support countermeasure of common small area roof caving has been studied and mastered,but the large area serious roof caving is difficult to be controlled,because the support method is very complicated and needs further study. By field investigation,the roadway of loaded-car line in Xing¢an Coal Mine was seriously destroyed. The length of roof fall is about 150 m and the maximum height of roof caving is 8.6 m. Supporting condition of serious roof fall in Xing¢an Coal Mine loaded-car line was investigated and studied by laboratory test and theoretical analysis. The cause of its failure was summarized as follows:(1) the intensity of wall rock is low;(2) original support is irrational;(3) water effect;(4) road way is deep;(5) structure stress effect. According to geological condition,rock character and destruction features,deformation mechanism of soft rock were ascertained as swell under high stress,and the supporting technology of double-arch flexible layer with rigid gap was put forward. The roadway is formed into double-chamber in space. Engineering effects indicate that double- arch flexible layer truss technique,as an effective method can be used to control the distortion of surrounding rock at the intersection successfully.