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一、一般情况 全国二十多个省(市)分布有裂土,而铁路通过裂土地段的长度约占全国铁路线总长度的1/5～1/6,由于裂土的工程性质很差,给铁
First, the general situation There are more than 20 provinces (cities) in the country where there are rifts, while the length of the railway passing the rift areas accounts for about 1/5 ~ 1/6 of the total length of the national railway line. Because of the poor engineering nature of rifts , To iron