Rain To The Fengfu Line Impact Analysis And Warning On The Slope Stability

Rainfall is evoked sloping geological hazard and artificial slope instability of importantreason, this kind of disasters often caused significant casualties and property losses, how toreduce the harm of slope hazards on society, has been the world governments concernedimportant issue. June2010for heavy rains cause Nanping area many landslides hugeeconomy loss and casualties. Topics for slope for Fengfu line K294+680~K294+900section, the side slope is period of old disaster area, in the June2010issue of the heavy rainsthis side slope has also had the obvious offshoring, here if landslide will produceunpredictable consequences. So, the study on the slope of the period of rain influence as wellas the establishment of early warning will produce certain economic and social value.This paper consider rainfall of landslides induced disasters of geological and rainfallcharacteristics, the selected topic area of unsaturated soil shear strength character study, andmake indoor experiment research of rainfall water seepage rule, and the subsequent usesaturated-unsaturated seepage finite element analysis of stability and strength reduction finiteelement technique combining fluid-solid coupling method to evaluate rainfall must under thecondition of the stability of the slope. In this paper, the main research results including thefollowing several parts:(1) through the pressure plate instrument and direct shear apparatus with previous testresults of the research results, this paper summarizes the unsaturated soil shear strength andmatrix the relations between the suction rules and explore the shear strength and matrixsuction relationship. The results show that with the increase of the suction matrix, andgradually reduce rate has been declining. Have to reshape soil do test results and the primarystate soil different, in high matrix, remodeling suction shear strength low substrate whencompared to the suction instead have all reduced.(2) Through the indoor test of the soil rainfall infiltration law. Heavy rain found, withrainfall relative rainfall intensity on the infiltration depth affected more; Rainfall intensityrelative to the soil with rainfall infiltration moisture content of volume much more influence.(3) through the variable head test for the saturated state of the soil under the permeabilitycoefficient of, and through the soil water infiltration of the curve mecessary function curve.(4) The finite element analysis software Geostudio module of the analysis andcalculation of the indoor rainfall Seep test model, and numerical simulation study if proposeddata can be better fitting indoor test data. The results show that the wet curve off in numericalmodeling in calculating results pore water dissipate too fast.(5) using the finite element simulation software module and the Slope of the module,combined Seep calculated under the condition of different rainfall Slope damage time, that the suction and Slope safety coefficient matrix of the relationship figure and rain early warningfigure.