Research On Slide Mechanism And Treatment Optimization Of Chaancun Landslide In Dalian City

Relying on “Chaancun landslide geological hazard exploration in Dalian City”and the National Treasury Geological Disaster Prevention Project “Chaancunsuper-huge landslide disaster treatment in Dalian City of Liaoning Province”, theChaancun landslide slide mechanism and treatment methods are studied in this paper.And takes the treatment optimization design as a goal, the optimal design methods ofcut slope, anti-slide pile and open ditch are also studied. Finally, optimal selection ofcomprehensive treatment method are studied, and the landslide treatment optimizesystem is establish.The main achievements of this paper are as follows:1. Comprehensive field geological investigation of Chaancun landslide is taken.Geological, hydrological, meteorological data are collected. From the aspects oftopography, lithology, geological structure, hydrogeological conditions, seismicactivity, and human engineering activities, the engineering geological environment isstudied. The basic characteristics of Chaancun landslide, the structure and thematerial composition are analyzed. Combined with the landslide displacementmonitoring data, the horizontal and vertical distribution characteristics, the positionof sliding surface, the sliding direction and sliding state are analyzed.2. Through the study of the geological history and the valley evolution process,the old landslide is damaged by the role of lithology structure, faults and river.According to the structural characteristics of the slip zone and landslide, from theaspect of the engineering geomechanics, and using the numerical simulation methodsimulation to study of the new landslide slide mechanism. The human engineeringactivities led to the partial resurrection of the old landslide, and then the newlandslide formed. The Chaancun landslide is a trust load caused landslide. The mainfactors affecting landslide are the weak structural surface occord a chain deformationas destruction-unloading-redestruction, which is the basic conditions of a slide; Both sides of the border are two faults, which forms a chairs circle-like terrain; the poordrainage system results in incureased hydraulic gradient of the slope body, and thesliding force incureases, the rainfall is the dominant factor of the landslide; theartificial excavation of the slope foot is the direct factor of the landslide.3. Using the slope cut slope, filled back soil, anti-slide pile, open ditch, blindditch and borehole joint drainage measures for comprehensive treatment of theChaancun landslide. The detailed design and the design process are given.4. To improve the transfer coefficient method, the remaining landslide forceformula is derivated, which is considered earthquakes and groundwater conditions ofthe landslide. And then, cut slope optimization method is given. The anti-slide piledesign parameters and open ditch design parameters are studied; the minimumobjective optimization mathematical model is established. Using artificial fishswarm algorithm optimization design method to design the anti-slide pile and openditch. The uncertainties of landslide comprehensive treatment are analyzed. Basedon fuzzy multi-objective optimization method, the optimization model ofcomprehensive treatment is given. Then, the optimization treatment system isestablished.The main innovative points of this paper are as follows:1. From the aspects of the geological history and the valley evolution process,and the engineering geomechanics, the slide mechanism of Chaancun landslide isstudied.2. Combined with the software of Cocad, Surfer and Ansys, the high precisionsimulation model is established, the slide mechanism is analyzed.3. The artificial fish swarm algorithm is the first time to apply in the optimizationdesign of the anti-slide pile and open ditch, multi-parameter optimization design isrealized.4. Comprehensive application of decision theory, lattice theory and fuzzy settheory, the fuzzy mulltiobjective lattice-order decision making are used to proposedoptimization model, the optimization treatment system is established.