Geotechnique studies of earthquake

Description

Introduction: This report pays to description and explanation of various geotechnique characteristics of stuffs, challenged in Rajaii Dasht earth quake in Rudbar of Ghazvin Province. In its first season, geographical and geological properties, of sliding location has been discussed and its second season, geotechnique position of present materials in sliding area has been studied and discussed. Basically, Rajaii Dasht is located on alluviums of margin of Shahroud River and relatively vast desert has been existed from accumulation of alluviums that move than Rajaii Dasht, many of villages are located in this village and due to being adjacent to this desert to permanent river of Shahrud, major activities of agriculture of this region is carried out in this part. Rajai Dasht earthquakes is almost located at the end of asphaltine road and Ghazvin-Rajaii Dasht and they contain 2 earthquakes. They are named under title of small and big earthquake. Big earthquake of Rajaii Dasht which involves a vast zone is located adjacent to south western beach of Shahroud river and direction of slide is as slide stuffs move towards river. This slide seems to be old and it has spent several work phases and also it seems that this slide is active yet and in type of regressive and here is possibility of move end of mentioned parts to apex of slide. Small slide of Rajai Dasht that it is paid to mention various geotechnique characteristics of that, has similar characteristics to big slide and only difference of them is in a little of slide location and another one is direction of slide which in this case, direction of slide is towards small both line in below of slide and in direction of almost SE. It is necessary that both lovely and small earthquakes of Rajaii Dasht is in types of earthquakes, with circular failure. About cause and definition of project of type of proves of shall slide of Rajaii Dasht, vest hold explain that basically from location of contact area between crowns of both big &small slides of Rajaii Dasht that they have distance about 20m from each other, a pipe line passes and water of Shahroud river is pump used by this pipe line to upwards heights of this viewer for agriculture consumptions. It seems that gradually, crowns of these tow slide, during regression and closing to each other, but any way  pipe line, located between these two slides has begun to move indirection of small slide of Rajaii Dasht now &traces of deterioration of platforms which pipes are located or them and also existed tension forces in metal rings for prevention aim and joiner of pipes and platform can be observed according to figure 2-1. So, in case of not perverting of small slide movement to Rajaii Dasht, finally mention pipe line has been undergone fracture and water supply to heights will undergo interference and non compensate damages to agriculture of the region.