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以嫩林线602km基床热融下沉病害为例，论述用冻结路基的方法来恢复路基基底冻结上限，通过保温措施，保证冻结上限不再下降，从而达到整治多年冻土地段路基热融下沉的目的。
Taking 602km submarine bed heat sinking sunken in Nenlin line as an example, the method of freezing subgrade is used to recover the upper limit of subgrade freezing. The measures of keeping warm are used to ensure that the upper limit of freezing will not decrease any more. Shen purpose.