The Airport Karst In Bijie Of Guizhou Collapses On The Cause Analysis And Appraisal Of Stability

Guizhou Bijie airport is located in the feixiong village xiangshui couty dafang country ,where lies at the southeast of Bijie city, From Bi Jie City, the st-raight line is about 18 km apart from each other,for 4 C, for branch line airport inside Guizhou Privince, 2600m long airport runway, width 45m, road safe-ty at both ends of the long -300m,head of district 3200m of the flight, the both sides soil surfaced road area ends 91m respectively.. Bi Jie City airport construction, will improve Bi Jie Territory traffic condition , enhances external exchange, drive cornerstone industry formation touring, accelerate industrial restructuring, promote sustained society economy coordinated growth. At the same time, build the Bi Jie City airport, also beneficial to consolidatingGuizhou Bi Jie City airport space is etching structure general configuration of the earth's surface , area emersion rock stratum is that triple-lap is set of Yong Ning town strata , rock sex gives first place to limestone , marl , disheartened rock of mud , dolomite and mud shale. Study area inner structure develops comparatively, the make for wrinkle has been composed of area inner structure network system commonly with the tearing tectonic zone of north and south , from east to west structural fracture zone and thing , that the passage having composed groundwater's, is the karst water beneficiation area, has controlled the make for studying area inner earth's surface subsides , has been one of the main factor studying area inner karst subsides. Study the area inner subsides with the earth's surface such as funnel , channelling and soil hole give first place to, bar-like distribution of memorial, the person is formed by stratum rock what nature and geologicstructure control.Study by the fact that the airport carries out the analysis surveying on Bi Jie City, complexity thinking that subside and underground karst of the earth's surface of Bi Jie City airport area inner develops, pair of airports runway are reached navigating a station building owing to here waiting for important location to have bigger effect,on the thesis basis in systematic analysis Bi Jie City airport engineering geology ambient condition, weight has set forth area inner earth's surface subsiding to form cause of formation mechanism, and the earth's surface subsides to area inner body's geology spends a model generally having carried out an optimization and having been summed up as synthetically, And depend on karst load cause collapsing mechanism the overburden stability forecast model having deduced out a karst cave under outside load effect, has carried out the analysis , at last secretly scheming against on the stability studying the area inner's undergroundly karst cave and according to the formula infering out , has proposed that to the countermeasure studying area karst subsides to monitor the dominant ideas forecasting and studies to underground karst cave unsteady prevention and cure studying the area inner's, by studying to all above analysis on the rationale,reach main conclusion of the following:(1) It is a complicated body of geological calamity to collapse in the earth's surface of karst, it forms influence of receiving factors such as climate, rainfall, environmental condition of geology, geological geological structure and crustal movement,etc., have phased space-time.(2) Studies the area inner subsides with the funnel, channelling and the soil hole give first place to, with the perpendicularity and level growth, subside to experience and observe a form being more to circular, grow bar-like, shapes such as ellipse, irregularity and compound type is developed specially , is subsided to experience and observe a memorial taking a type to scatter, is controlled by the stratum and area structure; The perpendicularity growth corrosion hole body and the level growth corrosion hole body have interweaved mutually, have been composed of the groundwater network passage commonly, have provided driving force basis condition to studying area inner karst formation and developing.(3) According to geology structural body and karst development characteristic to study district, set up underground cave with stalactites and stalagmites different geology general to take model, and has analysed and researched the formation mechanism that the karst collapses in the district on this basis.(4) Karst collapse in the mechanism of load-induced collapse of the basis of theory, this text put forward function that cave with stalactites and stalagmites load outside lay karst prediction model of stability in karst, utilize their formulae of calculation to carry on computational analysis to underground cave with stalactites and stalagmites and stability studied in the district.(5) The stability in analysing and researching the district further analyses and researches the room of rock cave with stalactites and stalagmites and loadsthe deformation characteristic under function outside at the same time, this textutilizes the numerical simulation method to imitate and analyze the room of underground rock cave with stalactites and stalagmites, thus offered the theoreticalfoundation for studying the karst and collapsing and loading the mechanism destroyed in deformation outside.(6) The karst collapses and adopts predicts, puts prevention first in early days, manage in order to complement especiallying in the studying area, thinking of prevention and cure that prevent and cure and combine; Collapse to unstable district karst administration measure adopt the earth's surface close prevention of seepage, underground strengthen measure and structural thing person who cross over method.