土坡稳定分析的改进条分法

对于土地沙漠化程度的量化评价至今仍处于研究阶段,还没有比较成熟的方法。在分析已有研究成果的基础上,提出以沙漠化指数来表达区域土地的沙漠化程度。以全国沙漠化土地普查资料为基础数据源,首先确定了对具体的沙漠化土地斑块数据的标准化处理方法,然后分别对中国北方12省区沙漠化重点县进行土地沙漠化程度计算,结果表明,沙漠化指数的分布趋势与沙尘暴发生日数的分布趋势相似,沙漠化指数可以相对准确地体现区域沙漠化程度。

An Improved Slice Method for Stability Analysis of Slope

The circular slices method is one of the normal method for analyzing stability of slope which assumed the stabilities of individual slice is equal and equaled to that of whole slope, and belongs to an imprecise limit equilibrium method of rigid body with some irrationality. With a simple slope as research model, the circular slices method is improved. Postulating the slices can transfer internal force each other and the stabilit ies of individual slice are not equal, the differentiating condition of slope stabilization states is put forward via studying the transmission principle of slices force interacted by each other, and the theory formula calculating interact ion forces of individual slices is deduced at a stable slope. Based on above, the theory formula calculating stability factor of whole slope from the stability factors of individual slice is also deduced according to the principle of disjoin- join and the principle of weight weighted average of sliding factors.