The subsidence of the bottom and the cracks in the middle of the bottom are caused by temperature gradient and melt gravity during crystal growth.
晶体生长期间，温度梯度和熔体重力引起的热应力和压力应力使坩埚底下陷并在底的中部产生裂隙。
The ring wall base resulted in sudden change of stress and formed steep subsidence zone at the ring wall on soft ground base, being unfavorable to stress at the bottom of the tank.
其次，当罐直径越来越大时， 混凝土环墙的温度应力和干缩成为设计难题。
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