论文部分内容阅读
近几年在深表土中施工冻结井筒,采用双层井壁时,发生了一些事故。有的冻土墙塑性变形过大,发生断冻结管;有的外层井壁各施工段下端常被压坏;有的内壁套完后也出现压坏的现象。产生这些事故的原因,我认为主要是计算冻土墙厚度时对荷载取值偏小,而冻土强度取值又偏高。一、冻土强度冻土的强度主要是由胶结它的冰的强度确定的。因为冰比冻土更富有粘滞性,冰流变变形比冻土慢。土在冷却时并不是它内部
In recent years, construction of deep-frozen soil in the wellbore, the use of double-wall, there have been some accidents. Some of the frozen soil wall plastic deformation is too large, freeze-broken pipe occurred; some of the outer wall of the lower end of the construction section is often crushed; some inner wall sleeve after crushing phenomenon also appears. The causes of these accidents, I think the main calculation of the thickness of the frozen soil wall when the load value is small, and the value of permafrost values and high. First, the strength of frozen soil The intensity of frozen soil is mainly determined by the strength of the ice it cements. Because ice is more viscous than permafrost, the ice flow is more deformable than the frozen soil. Soil is not inside when it is cooled