The Test Research On Soil Landslide's Stability Influenced By Crack Water

In nature, some pull cracks are caused frequently by landslide mass deformed; running water on the earth's surface bringed by rainfall will flow into cracks and infiltrate into landslide mass and influence landslide's stability. This paper bases on this kind of common phenomenon, research quantity (or half quantify) influencing to soil landside's stability by means of test in home. This research can supply new train of thought in research of landslide's forecast and prevention and cure. Firstly, this research directed towards single crack, to research distributing feature of streamline and infiltrating amount and infiltrating strength etc. Then base on infiltrating feature of single crack, to test and assess landslide's stability with more cracks. through research, some recognizing and conclusion as follows:(1)According to substance component feature of soil landslide in nature, choosing clay, fine sand, coarse sand, cobblestone and water as basic materials; with these materials, three types of landslide mass materials and four types of sliding zone materials are compounded. Then test the parameters of landslide mass materials and sliding zone materials. At the same time, sliding zone cutting strength is tested at different saturation, by this means, obtain the result that cutting strength have linearity trend in changing with saturation.(2)Making single crack testing model in the equipment, fill crack with water then observe and test water's seeping and streamline's distributing feature in different time. With the distributing feature of streamline, amount of infiltration can be counted. Change the depth of crack and water level and material, researching the relationship between amount of infiltration with above factors and then drawing the curve by feature of infiltration. From research finding that the amount of infiltration and average rate of infiltration have relationship of logarithm function to infiltration time; amount of infiltration is directly proportional to the water level' height's square and directly proportional to material's infiltration coefficient. Sum up relations above, we get the expression of amount of infiltration and water level's height and depth of crack and infiltration coefficient.(3)With one of landslide mass material and sliding zone material to test landslide's stability synthetically. Testing is divided into four times by the number of cracks in landslide mass. with the results from testing of infiltration in single crack, we can conclude distributing feature of streamline in landslide mass and features of infiltration with more cracks in landslide mass. Namely, in identical time, amount of infiltration will increase with the increasing of cracks' number, in the same way average rate of infiltration will increase. Amount of infiltration and average rate of infiltration have relation of logarithm function trend between hours of infiltration.(4)Through research about influence to factors relation to landslide's stability effect by crack water, we compute the landslide's stability in synthesis and work out the process of landslide's stability chang. Namely, landslide's stability reduces on and on following the increasing of infiltration time of crack water; when no water in crack, landslide's stability will rise gradually. On the basis of consequence of the synthesis test, we get half quantify relation expression of landslide's stability and amount of infiltration of crack water, and get conclusion that feature of water level in crack will control landslide's stability indirectly by controlling amount of infiltration;pressure of still water in crack has obvious harmful influence to landslide's stability;...