The Deterioration Law Of Mechanical Characteristic For Silty Clay Under The Action Of Wetting And Drying Cycles And Its Application In Slope Stability Analysis

In a typical mountain valley terrain to carry out complex urban infrastructure areasusually have an extreme shortage of buildable land resources, the lack of obviouscontradictions suitable for large-scale construction of nature "open ground", whichmeans that in this type of construction in the mountain city artificially high fill subgradeand foundation be made to the mountains to fill the ditch will be one important way tosolve the construction site. Stability ultra filling body has become the key issuesaffecting the security and stability operations engineering. Among the many factorsaffecting the stability of the ultra-high embankment, the rainfall infiltration is a majorcause damage induced fill slope instability, especially the threat of heavy rainfallcontinued stability of the slope is more can not be ignored, clear rain infiltration ofultra-high embankment slope stability mechanism and influence the process ofdeformation and failure of important guiding significance for guiding filling bodydrainage design and construction. In view of this, the paper ultra-fill slope of an airportexpansion project in Chongqing as the basis to carry out impact studies on slopestability continuous rainfall ultra filling body has important scientific significance andpractical value.In this paper, by collecting data, geological surveys and other means of identifyingthe engineering geology and hydrogeology of the environmental conditions of theairport area, understand and grasp the structure of the type of bedrock slope and fillingbody deformation and failure mode Heaping; through the construction site area beforethe market research master topography, geology and rock slope stability conditionsairport Area in general; geological conditions in the area of the farm, constructiondesign, field test, analysis of deformation and high fill subsidence monitoring andcorrelation detection results, combined with engineering geology and numericalsimulation of feedback, clear conditions of stability of high filling body construction,and provide optimal solutions to its construction design; through research and fieldvenue hydrogeological groundwater and pore water pressure monitoring and analysis,combined with field permeability test study clarify rainfall infiltration of high fillsedimentation and influence of slope stability for airport construction process high fillstability appears to provide programs and reinforcement design problems to solverelated construction occurred during the geological and geotechnical engineering problems. This paper studies the work and results are as follows:①By using the principle of the limit equilibrium method, using the calculation ofstability of geotechnical calculation software Geostudio module, calculation in differentconstruction process of high fill slope stability coefficient, it is concluded that thedynamic compaction and layered rolling can obviously increase the stability.②By using the principle of the finite difference method, the calculation softwareFLAC3D complex mountain model process is discussed, and methods.③The FLAC3D numerical simulation of high fill slope deformation and stabilityof a more comprehensive in-depth analysis, from the perspective of mechanism, internalcause expounds the cause of this kind of deformation and failure phenomena, for theobjective evaluation of the study area high fill slope stability provides sufficientevidence.④The FLAC3D numerical simulation analysis of the slope stability of high fill:complex foundation bedrock under the condition of deformation and the originalfoundation of high fill body configuration, the foundation stiffness and fill body heighthas a certain relevance. Its deformation pattern are mainly composed of verticaldeformation, and with a certain amount to the displacement of the slope.⑤In the study area typical profile simulated rainfall events under the condition ofhigh embankment slope stability, it is concluded that the slope stability coefficient curve,along with the change of rainfall is and get in continuous rainfall24～36h is thebiggest change period on the stability of slope, and to take certain measures to ensurethe stability of the slope.⑥In the study area typical section study of slope stability in the concreteconstruction process, from the settlement isoline map can be found in the largestsettlement did not occur in filling the top, but in the middle of the filling body, from theshear strain increment contour map can be found in the shear strain increment thelocation of the maximum mostly concentrated in the bedrock and the fill body junction,so bedrock landslide is not easy to ignore the intersection position.