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对某深基坑冻土墙的受力与变形进行了数值模拟 .结果表明 :基坑施工中 ,冻土墙内环向压应力增长显著 ,是影响其变形与安全的关键因素 ;冻土墙累计最大侧向位移通常超前出现 ,施工结束时 ,最大侧向位移出现在 0 .7倍基坑深度处 ,其值约为水土合算计算结果的 2倍 ;基坑施工过程中冻土墙内基本无塑性变形 ,且不发生非衰减蠕变 ;冻土墙最大侧向变形处及基岩交界面部位冻结管受力最不利 ,应加强对上述部位冻结管安全的研究
The results show that the circumferential compressive stress in the permafrost wall increases significantly during the construction of the foundation pit, which is the key factor affecting the deformation and safety of the frozen soil wall. The cumulative maximum lateral displacement generally occurs ahead of schedule. At the end of construction, the maximum lateral displacement occurs at a depth of 0.7 times the depth of the foundation pit, which is about twice as good as that of the soil-water calculation. During the construction of the foundation pit, the basic No plastic deformation, and no non-decay creep; the maximum lateral deformation of the frozen soil wall and the interface of the bedrock most unfavorable force frozen tube should be strengthened on the above parts of the safety of frozen tubes