Estimating Of The Landslide Stability And Fatalness Cause Of Earthquake In Muli In The Szechwan The Province

The tectonic structure is belongs to Shongpan-Ganzi geosyncline fold the system and Yangzi son paraplatform combines the department in the Muli is Szechwan south. The geological structure is complications, from the Mesozoic Era started in last phase of come from India of ocean plate took place the violent collision to cause toward the continental plate of second Europe of six inside the orogenic belt, orogene, orogen construct( earthquake) the activity to turn worse. Muli landslide that locate at after the Zigu ground of February 2 in 1980 took place 5. 8 Richter Scale earthquake, have already result in a great deal of building shake, the foundation settlement sinking, the landslide have the 1/3 of the building of population the danger house, result in the huge economy loss. Although the landslide mass scale has 800,000 m~3( have another 3,380,000 m~3 ancient landslides) only, it last live 20,000 populations. For more than 20 years, the landslide always is perplex the Muli government and people in the county.This thesis is carrying on the comprehensive analysis to the each influence that landslide be subjected to currently factor up, analyzed the Muli landslide of geology cause of formation, the stability, fatalness cause of earthquake etc., multiple point as to it' s affect of the occurrence development and the slope stability that the action maximum nappe tectonics (earthquake) to evolve the trend, the understanding to the Muli landslide deeply.According to the feature and the formation condition analysises to the deformation of that landslide, the Muli evolved to experience in the Muli landslide and the formation of the creep body a from the earthquake (or the slowness of the nappe tectonics to squeeze)- ground fissure-creep- earthquake, seism( or the slowness of nappe tectonics)- new ground fissure- creeping slip- the new creeping slip body- landslide enters to evolve the process gradually, in this process.The particular geology texture and earthquake result in by it expects the formation to rise to the landslide first a goes to the important action of turn off, the multifarious and tiny (small) earthquake and rain precipitations that come and then to take place continuously, mankind the life water use exhausts to then urge the landslide and the creep body stabilities to further lower at will, keeping go to the landslide formation. The Muli landslide belongs to jostle to slip to move the tension fracture (jostle the intermittent age to unload the gravity) type landslide. Period in the endless geology history, the slope experiences such as the common action of the other parts of country quality inside the earthquake, tectonic stress, self weight stress, rain precipitation and groundwater etc., the slope rock soil mass follows the structure face, weak structural plane or ancient efflorescence occurrences to slip to move the deformation, along with the compression stress concentrated-intermittent unload the weight but the creation tension fracture seams, after being to break the face run-through, the landslide starts enter namely slippery( creeping slip ) move or transform the breakage stage.Locate to nappe tectonics body in Muli place of a body of rhombus round to limit the fault total four, south north of the Liziping-Maidi, north east of the Yangwozi fault, southwest of Hanjiawan fault, east of Bowa fault (respectively belong to the Ganzi-Litangdeep fault and Xiaojin river deep-seated fault), respectively it cause the earthquake 7. 23-7. 68 Richter Scale. The biggest risk earthquake is in the Ganzi- Litang deep-seated fault takes to 8.655-8.675 Richter Scale, taking to 8. 135-8. 19 Richter Scale in the Xiaojin river deep-seated fault, tne maximum is 8.9 Richter Scale at the same time.Main influence action of the tectonic earthquake is stability on the finite element method and limit equilibrium method on the whole at state of nature.Compute the result enunciation: The Muli landslide stablity of computation Yingling profile is placed in the stable state under the natural state,slide state under the satisfied water state the earthquake state, where be placed in the strong creep slip. Should as a result display the earthquake to rise to the slope deformation to lead to control the action first, the groundwater of the meteoric water and the domestic sewage infiltration formation to the slope stability rise follow-up control action. Under satisfied water state, the thrusting force of Muli landslide is 1649.29 kN/m ~ 6862.57 kN/m. Recommend thrusting force, is the 6870. 00 kN/m.The computation result is in accordance with the out of door theobservation the analysis, showing that the computing method chooses to use basic match the slope objective and actual. While carry on the anti-slide pile engineering design, the thrusting force (the residue force) that establishes anti-slide pile is at the request of take the earthquake and satisfied water state maximum value, to prevent from disaster purpose.