Research On Development Law And Risk Of Accumulation Llandslide In Qin-ba Mountain

Based on the southern Shaanxi rich accumulation landslide example material and ofdomestic and foreign similar research result, with Lueyang County’ accumulation landslide asthe research background, based on the investigation and statistics, the use of statistics andinformation science theory and method accumulation landslide evaluation, this paper proposes anew accumulation landslide risk assessment method, through the typical example ofcalculation accumulation landslide, show that the theory and method for accu-mulationlandslide risk assessment to provide a more secure and reliable and practical convenient theorybasis. This paper studies to perfect the existing risk assessment method has some referencevalue.The main conclusions of paper are as follows:(1) According to accumulation landslide investigation results, will accumulation landslideinto four categories, namely gravel soils landslide, including viscous grain gravel soils landslide,including gravel cohesive soil landslides and cohesive soil of landslides.(2) through the analysis of different types of typical get accumulation landslidedevelopment rule of the landslide are as follows: Slopes in25~40°are high landslide areas;Slopes in8~25°are The landslide happened moderate area; Slopes in41~50°and51~60°are the landslide happened not easily area; The natural slope the groundwater drainchannel system development, groundwater seepage of great not uniformity and focus on thecharacteristics of the seepage; Rainfall, especially heavy rainfall, is the main trigger factorsaccumulation landslide; accumulation landslide is a chain. (3) In the study area through accumulation landslide parameters value, and puts forward theresearch area accumulation landslide sliding surface soil mechanics parameters takerecommended list.(4) put forward accumulation landslide evaluation method, that is, based on the method ofreliability for failure probability Pfand safety coefficient K landslide classification: highlydangerous Ⅳ, moderate riskⅢ, mild dangerousⅡ, safetyⅠ, so as to accumulation landsliderisk assessment.