Analysis of the Development Mechanism and Prevention Measures of Gravel Soil Landslides
[Purposes]Taking Jiaguangou landslide in Lixian County,Gansu Province as an example,the stability coefficient under the action of precipitation and earthquake is calculated,the development mechanism is analyzed,and the prevention and control countermeasures are provided for the develop-ment of gravel soil landslide under different conditions.[Methods]The strength reduction method is se-lected as the calculation method in this article,and the constitutive model used is the Mohr Coulomb model.At the same time,Midas finite element software is used to numerically simulate the Jiaguangou landslide.[Findings]The stability coefficient of the gravel soil slope under natural conditions is 1.271 9,which is basically stable;Under rainfall conditions,the stability is 1.125 and it is in an unstable state;The stability coefficient under earthquake conditions is 1.006 8,indicating an unstable state.[Conclu-sions]During precipitation,the internal rock mass of the landslide is eroded by infiltration water,gradu-ally forming a saturated zone at the top of the loose accumulation and underlying bedrock layer on the slope surface,becoming a potential sliding surface for landslide instability and sliding;During an earth-quake,the anti slip force of loose deposits in the landslide body will gradually decrease until it is less than its own weight,and the landslide will experience unstable sliding.In addition,under the influence of river erosion and erosion,the front edge of the landslide is constantly eroded and eroded by river wa-ter,forming an unreasonable cut slope,leading to the redistribution of stress inside the landslide.Under external forces,the landslide is prone to unstable sliding.
gravel soil landslidelandslide causesdevelopmental mechanismlandslide control
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