Experimental Study On Mechanism Of Large Landslide Induced By Friction Heating

Landslide in the sliding process resulting in friction heating phenomenon,In view of the intrinsic influence mechanism of frictional temperature increasing on slope landslide.the slope of field engineering is taken as the object of study in this paper,The external process of slope failure in alternation of wetting-drying conditions is studied by similarity principle.Using the similarity principle test on 9 groups of similar model slope,each group test slope under the effect of friction heating in pore water pressure change law of slope stability conditions of the test results,In addition,the direct shear apparatus of DSJ-3 type add warming device was tested after the mechanical parameters of slope layer material direct shear test and research.The research results of this paper are as follows:(1)By the model test device made-self,9 groups The landslide model test was made by friction heating,The test results of 9 groups of slopes under the condition of temperature increase are obtained,1-6 test without the occurrence of slope landslide,Small landslide occurred in the lower part of slope 7,The critical temperature of landslide is 57.1°C,the landslide distance is 22 cm,the medium scale landslide,The middle scale landslide occurred in the lower part of slope 8,The critical temperature of landslide is 54.3°C,the landslide distance is 26 cm,a large scale landslide occurred in the lower part of slope 9,the critical temperature of the landslide is 52.7°C,the landslide distance is 77 cm.(2)Based on the slope landslide of interlayer materials by direct sheartest with temperature increase,the shear strength of the slope 7 due to the internal friction angle decreases 0.23 kPa,the cohesion decreases 4.61 kPa,the shear strength of the slope 8 due to the internal friction angle decreases0.08 kPa,the cohesion decreases 5.55 kPa,the shear strength of the slope 9due to the internal friction angle decreases 0.14 kPa,the cohesion decreases 5.85 kPa,.It can be seen that the cohesive force of slope interlayer material is reduced,which leads to the main cause of landslide.(3)After a long time in alternation of wetting-drying condition,small sliding occurs on the slope,Then the frictional temperature increase caused by sliding of the landslide reduces the shear strength of the slope and induces a large scale landslide.