Effect Study On The Formation Of The Thick Loose-storey Steep Slopes Mechanism And Control Engineering

The 2~# landslide of the Chuan-Zang Road 102 landslide-group is a giant landslide mass which is growing on the 300 meters thick round high-steep slope of the loose layer. Continuously unstable destruction yearly and behind it there is part of the high-steep slope unstable destruction which is about 200 meter high , cause giant influence to the Chuan-Zang Road regular operation. It is under the very special geology background ,Qinghai-tibet plateau , with the Earth's crust rising strongly, efflorescing and eroding seriously , and the river shearing downside rapidly etc. that form such thick loose deposits, which has very important theory and practice meanings to make clear these giant and thickness loose deposits geology background, materials origin, forming process and the substance peculiarity etc. to the unstable induce factors, developing tendency, stability evaluation and how to prevent and cure etc. of this kind loose high steep slope, and the landslide etc. disasters growing on it.This article is based on analyzing and studying many materials ,according to the Qinghai-Tibet plateau geology background, starting with the rise character of the plateau, tectonic activity and earthquake character, climate and glacier characters, combining with geology engineering condition of the research area, analyzing the forming mechanism of the high-steep slope under the special geology background, Qinghai-Tibet plateau: that isâ‘ rising effect produces the change of climate, glacier behaviors, and earthquake, and large-scale tectonic hot event and melting actions etc. effects accelerate the effloresce speed of land, thereby produce large quantities of loose deposits at the top of the plateau and the slope zone; â‘¡the happenings of glacier, mud-rock flow, and landslide etc. make those loose deposits move collectively, and form giant and thickness deposits at some areas;â‘¢the fierce erosion of river make those giant and thickness loose deposits which are piled fast shear downside and form high-steep slope.Based on the analysis above and the onsite prospect research, discussing the engineering geology character, induce factor, unstable destroy character and so on in details of the 2~# landslide growing at the loose high-steep slope of 300 meters thick. Combining with the loose deposits characters, taking the way of finite element method and limit equilibrium to institute the wholly stability and the high slope behind the 200 meters round high-steep slope , combing with its deform styles and road engineering characters ,put forward a comprehensive cure measure, which take the prestressed anchored cables rib-board wall as the mainly stability engineering , so as to build high fill of earth embankment and cure slope.Because of the great difference between the loose medium and rock mass medium, two-dimensional elastic-plastic finite element method way is taken, combining with the cable holding test result on-spot, analysis and institute the large tonnage anchored cables stress force transmiting and the stress force responding question in the loose medium, the lower of the loose mass strength cause the end of the anchored ability question, for the minor loose mass deformation modulus cause the prestressed declined question and because of the weak texture force of the loose mass causes the anchored group effect question. It concludes the main destroy styles...