| Loess is a kind of clay powder located in drought-semi-arid areas, its physical and mechanical properties change constantly under the action of rainfall and evaporation, furthermore, The loess has many harmful engineering properties, such as:collapsibility、vertical joints. Makes the landslide disaster occurred frequently, how to ensure the stability of loess slope has become a desiderate problem to be solved, while rainfall is the main factor inducing the instability of loess slope, therefore, study the stability of loess slope under the condition of rainfall has great application value and theoretical significance.This paper takes taiyuan loess as the research object, on the basis of laboratory experiment, established a numerical analysis model, analyzed the slope stability of solidified loess under different rainfall patterns, the main research results are as follows:(1)The liquid plastic limit and soil water characteristic curve experiment of different proportion of solidified loess have been carried out, and using origin 8.0 software fitting analyzed the experiment results, using the unsaturated permeability coefficient calculation method, acquired the unsaturated seepage curve of solidified loess under different proportions on the basis of fitting results,concluded that SH can obviously increased the liquid limit, plastic limit and plasticity index of loess, and the solidified loess has preferable moisture curing performance, but not the more content, the better.(2)At this present, the main consideration is the strong rainfall patterns When study the effect of rainfall on slope stability, This article USES the finiteelement software Geo – studio, analyzed the initial state of loess slope on the basis of using VADOSE module, established a seepage analysis model on the use of SEEP module, analyzed the slope seepage field under the condition of different antecedent rainfall 、rainfall patterns and different crack depth, on the basis of summarizing the analysis of seepage variation law, reveal the influence mechanism of loess slope stability under the condition of rainfall.(3)Import the seepage which is analyzed by SEEP module as the initial condition to the SLOPE module, and uses the Mogenstern- price safety coefficient method to analyzed the slope stability, found that: the destruction of the unimodal type rainfall on the slope is the largest, the type of uniform rainfall is minimum, and its safety coefficient of descent stage under the condition of different rainfall intensity is also different。(4)In the case of unimodal rainfall, analyzed the best mixed thickness on the basis of the best dosage for SH, concluded that: the optimum content of the loess slope SH is 14%, the best thickness is 60 cm.Through the above research and analysis, concluded that SH applied to the slope is scientific and reasonable, the results of solidified soil improvement technology provides a theoretical reference value. |
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