| The GaoTangGuan landslide in direction of WuShan the three gorges three important areas in the resettlement of immigrants,. with an volume of45.76×104m3and an average thickness of25m, The subprime landslide is part of the old landslide resurrection with an volume of159500m3,is a For a compound landslide,it is serious threat to Placed the safety.This article made a detailed geological analysis on basic characteristics and formation-evolution mechanism of the GaoTangGuan landslide of Panzhihua airport, and carried out its stability calculation and evaluation. On this basis, the scheme comparison for the design of landslide control engineering was made, and such measures as anchor cable frame and anti-slide pile were mainly taken. The main achievements and understanding acquired are as follows:(1) The GaoTangGuan landslide is a loose deposit landslide(some part of slip surfaces were in the inner of the overburden) and the waste slag fill(that is mass rock or gravel soil) and the sedentary silty clay slid along the interface between the overburden and bedrock (that is carbon mudstone the sand-shale) when the airport was being built. The formation and evolution of the landslide is mainly due to the joint influence of the loading of the waste slag, the control over slide of the overburden-bedrock interface, the groundwater to soften the slip soil and the inducement of the rainstorm. The comprehensive analysis showed its destructive pattern was creep-cracking and tractional according to its material composition, obvious deformation failure evidence and inducement, etc.(2) With the qualitative analysis and quantitative analysis method of combining the GaoTang view of landslide and its subprime landslide stability analysis evaluation. Qualitative analysis holds that there is an obvious landslide signs of deformation and destruction; The sliding face mechanics performance is poor, and near the sliding face to delay formation water, that slide silty clay further softening, therefore, in heavy rain landslide under the action of whole possible instability, in a potential not stable state. Limit equilibrium method calculation shows that natural conditions in each section stability coefficient are greater than1.05, the landslide in basic stable state; Heavy rains conditions in each section stability coefficient in basic1.0, the landslide stability in the state. Comprehensive judgement, GaoTang view of the landslide in subprime landslide natural state is in poor stability to basic stable state, heavy rains state is in not steady state; The landslide in the natural state in basic stability to steady state, heavy rain is in poor condition stable state.(3) According to different conditions of different safety coefficient, calculate the profile along the slippery surface and subprime sliding surface thrust value, of which2-2profile of maximizing the value in thrust500K.N. According to each section of landslide and thrust value main slip direction, the nature of the landslide (there are two layer sliding surface) and morphological characteristics, and draws up the "frame anchor and frame anchor" and "anti-slide pile and frame anchor" of two kinds of prevention and control engineering design, through the engineering feasibility and economic aspects of than choose, and eventually selected anti-slide pile and framework of the combination anchor scheme match again later qing dynasty the proper engineering, the prevention and control of the landslide engineering design.(4) Frame anchor reinforcement is depend on for the strata of around anchorage shear strength to deliver the pull to keep the landslide stability. In the arrangement of the landslide of3-5rows frame anchor, anchor single-arch design the anchoring force for190KN, anchor length of8.0m. The main frame under tension and the tension of the foundation caused by the force, according to the elastic foundation beam theory calculation and analysis, and vertical and horizontal spacing frame beams for2m x2m, section size of0.4m×0.4m.(5) Anti-slide pile is depend on the strength of the pile body, sliding surfaces of the anchor pile of elastic resistance to balance the geotechnical sliding surfaces of the surplus decline more than force. The design of the main layout in the landslide anti-slide pile in front, sliding surface is slow, can play a good role of sliding parts. According to each section in a pile thrust value and profile morphology characteristics, the selection of two models of the anti-slide pile, one of the type of pile section size of1.5mx2.0m, the pile length for16m, anchor length of7m, and the second type of pile section size of2.0mx2.5m, the pile length to18m, anchor length is8m. Total27root anti-slide pile. |
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