چكيده به لاتين
Abstract:
Embankments as part of road and railway projects confront with some limitations such as seismic slope stability, bearing capacity and earthworks volume. These limitations highlight particularly in the railway projects a little more.in reality the embankment is a hindrance for increasing axle load and velocity in railway tracks. Among the various methods of stabilizing embankments, the methods which don’t cut the traffic flow have more fascination. One of these methods is, using tie back to back system for reinforcing the embankment. In current research effect of grouted tie back to back system has been evaluated with laboratory test. For this purpose three embankment with 10 m height, 1:20 scale and lateral slope of 1:1 have been constructed and crown of them have been loaded uniformly. The first one constructed without reinforcing element and second and third ones have been constructed with ordinary tie back to back system (without grouting) and grouted tie back to back system respectively. In order to construct the grouted system first of all a set of test have been performed for determining the optimum arrangement of grouting system. Subsequently to reach this aim, the embankment with grouted tie back has been constructed. After that, the embankment have been demolished and the grouted media in soil have been assessed carefully. Afterward, the embankment have been constructed again according to previous embankment and finally embankment have loaded to determine the performance of grouted tie back to back system. Results revealed that in embankment with ordinary tie back, failure load and settlement in failure load increased 57 and 17 percent respectively. And in grouted system compared to ordinary one failure load 23% increased and settlement 45% decreased.
Keywords: Embankment, Tied Back to Back System, Grouting, Laboratory Model
