Study On The Relationship Between Mechanism And Control Project For The Typical Giant Landslides In Southwest China

As China's western development of large-scale infrastructure construction, and therefore various types of geological disasters occur frequently, including landslides, debris flows and other geological disasters Epigenetic The prominent development of a large number of which is greater than the size of 100×104m3 giant landslide. Some massive landslides come from a landslide accumulation of debris on, and residual ice accumulation stains, slope sediments composed of loose deposit landslide, and some other are giant rock landslides.Landslide not only to local residents caused great loss of life and property , also destroyed a considerable number of factories and mines, and seriously affect the railways, highways, waterways, and hydropower and other infrastructure security operations. Therefore, the research on the mechanism and control engineering of the huge langdslide is necessary.First, typical ones are chosen form cases of giant Landslide and analyzed, in which cases the successful ones of prevention and treatment projects are three ones, namely,Badu landslide in the Nanning-Kunming Railway,Zhenzilin landslide in Erlang Mountain,Tiantaixiang Landslide in Xuanhan,The failure case for control engineering is one,which is the Panzhihua Airport 12 # landslide; through the analysis of typical cases, the characteristics of a giant landslide control works are concluded from these cases, which to identify the relationship between landslide mechanism and prevention & treatment projects, and obtained the key to successful management of landslide.First of all, the formation and evolution mechanism of the landslide is accurately grasped, and then sum up the characteristics of deformation and failure to identify damage caused by the primary cause of landslide, on this basis, the targeted prevention and treatment is carried out for the massive landslide, so as to ensure the giant Landslide control works effectiveness.Then,through the definition of a giant landslide,the scope of the definition of landslide is given, and a clear landslide areas as research subjects is ascertained,which to provide the guidelines and direction for the subsequent landslide classification, mechanism and analysis of control model.After defining the scope of giant landslides,massive landslide classification is done from three asparts.First,according to the material composition of the landslide. Second, according to the shape of sliding surface.Third, the classification of giant landslide triggers. Forth, to classify according to ways of the landslide movement.after the analysis above three the formation & revival mechanisms of landslide are made:multi-range-creep - tension mechanism, multi-area-creep - tension mechanism ,multi-range-translation-gliding mechanism , push-type-creep - tension mechanism.Two typical landslides are selected,which are based on previous work,and to perform numerical simulation with the interaction between landslide and control works.The two typical landslides are Panzhihua Airport 12 # landslide and Badu landslide.By numerical simulation the following conclusions are obtained: 1, Panzhihua Airport fill-style landslide is the push-type landslide; Badu landslide is the pull-type landslide; according to the different deformation zones of the slope giant landslide can be partitioned into some blocks, and the corresponding partition and grading treatment could be conducted.2,the internal force law of anti-slide piles rows in the slope is that as, which is the load of the front rows the greater than the rear Piles; the middle of the pile in a row is greater than the force on both sides; pile failure modes for the rotational movement; Piles'load connects with the size of the soil displacement around piles,which a large displacement corresponds to a large force,and a small displacement corresponds to a little force;piles'constraints for the soil displacement is limited ,and soil between piles continue to move forward;blocked before piles,the soil will occur to flow around as the stream, trying to bypass the pile rows to move forward; pile is less than anchor about the restrictions on the role of soil displacement,because pile less impact on the far soil displacement field. 3, by defining load sharing ratio of pile rows the various forms of pile rows are measured; Eventually, for the trianglar-type piles around the two rows of piles load sharing ratio of 50% each, for the alignment-type piles of two rows of piles the load of the front row and back row share of 55% and 45%,for the plum-shaped piles load sharing ratio of the front,the mid and the back row were 45%, 33% and 22%.4,through underground drainage numerical simulation of Badu landslide, the landslide displacement has been reduced,underground drainage play the role of reduceing slide and improving landslide safety redundancy.Finally, according to some typical cases analysis on landslide control works and numerical simulation analysis,some suitable measures for landslide prevention and treatment were summarized in bypassing, drainage, anchoring and retaining ,the slope ratio method and the weight loss method, monitoring and warning; At last,the control models for the giant landslide: 1, antisliding pile+underground drainage control mode ;2.anchoring+retaining + underground drainage control mode; 3, cutting side + anchor retaining control model.