The process of the change in the frozen wall can be divided into four stages, i. e. the pre-circumscribed circling, the active freezing, the keep （or inactive） freezing and the natural recovery periods. It is assume...The process of the change in the frozen wall can be divided into four stages, i. e. the pre-circumscribed circling, the active freezing, the keep （or inactive） freezing and the natural recovery periods. It is assumed that the frozen holes are distributed on the circumference of a circle with radius R0 and the center concurrent with the center of digging shaft. Having a discussion on the water content together with the thermal effect and considering展开更多
文摘The process of the change in the frozen wall can be divided into four stages, i. e. the pre-circumscribed circling, the active freezing, the keep （or inactive） freezing and the natural recovery periods. It is assumed that the frozen holes are distributed on the circumference of a circle with radius R0 and the center concurrent with the center of digging shaft. Having a discussion on the water content together with the thermal effect and considering
