Study On Trigger Mechanism Between Rainfall And Loess Landslide In Northern Shaanxi Province

North Shannxi is frequently stricken with loess landslides which brings tremendous hazard to local residents and great challenge to development of local economy and industry.Many geological experts and scholars have accomplished great academic analysis and achievement with regard to the prevention & settlement of Loess Landslide.However,few study has been focused on the overall and holistic exploration of the inner mechanism between rainfall against Loess Landslide.With the aggravation of local resources exploration and influence of social activities,issues as water loss and soil erosion,soil degradation and ecological deterioration in Loess plateau has been intensified.Typically Loess Landslide tends to be growingly grave that prevention & settlement of Loess Landslide has remained high priority subject.Herein this article focus on the subject of Loess Landslide study,by investigating the climatological data and geologic conditions in North Shannxi,intending to explore the impact of landslide type,rainfall intensity,rainfall duration and rainfall pattern on slope seepage and stability via software ABAQUS,aiming to share some reference to mitigation of local loess landslides.Also specific Loess Landslide cases are used to validity the trigger mechanism between rainfall against Loess Landslide and share some reference to mitigation of local loess landslides.Major contents of this paper is as below:(1)Analysis of loess landslides and climatological data in North Shannxi to capture the time–spatial pattern for loess landslides and rainfall.This article has selected two slope models based on its geological structure and rock structure:Loess analysis model and Loess and Red clay analysis model.Applicable parame-ters is to be setup according to physic attributes of Loess and Red clay.(2)Conduct slope seepage analysis during rainfall via ABAQUS simulation software with input parameters on rainfall intensity of 10mm/d,25mm/d,50mm/d,75mm/d and 100mm/d.Slope stability analysis is undertaken from perspective o-f rainfall intensity,rainfall duration,rainfall type and slope type respectively.Th-e impact on landslide under different conditions has been investigated.Relationship trend line is then drawn based on the simulation results with selected rainfal-l intensity,rainfall duration,rainfall type,slope instability and pore water pressu-re.Accordingly the mathematical logic would be developed.(3)Conduct slope stability analysis via ABAQUS simulation software with i-nput parameters on rainfall intensity of 10mm/d,25mm/d,50mm/d,75mm/d and100mm/d.Slope stability analysis is undertaken from perspective of rainfall dura-tion,rainfall type and slope type respectively.The impact on landslide under dif-ferent conditions has been investigated.Relationship trend line is then drawn based on the simulation results with selected rainfall intensity,rainfall duration,rainfall type and slope instability.Accordingly the mathematical logic would be dev-eloped.(4)Select the actual typical cases of rainfall triggering landslide,and build its own slope model via ABAQUS and input related parameters,rainfall intensity as 15mm/d and rainfall duration as 10 days,conducting rainfall seepage and stability analysis via established slope models to further validate the impact of rainfall on landslide.Relationship trend line is then drawn based on simulation results with rainfall duration,seepage speed and slope instability.Accordingly the mathematical logic is to be developed.