| Buried pipes, such as use in the fields of water transportation, gas supply, heat supply and sewage project, consists of very important life-line engineering in cities. With the progress of various of cities and increase in population, especially in big cities, the pipe nets underground in city become more and more complex. Once buried pipes have been encountered accidents due to outside action, for example, construction by use of excavators, it is very possible for buried pipes to be damaged severely by construction machines, and then it can cause firing disasters, explosion, discharging of poisonous gas and chemical materials, which can threat greatly person life and assessment, even the secondary disaster also can be trigged, such as pollution of soil and underground water. Therefore, it is very necessary for engineers and government to protect buried pipes from being damaged by taking urge measures.Recently, different types of geogrids have been widely applied in reinforced retaining walls, protection of slope, and treatment of weak foundation. Herein, this thesis is aimed to present the protection measure by use of the function of isolation and load reduction by geogrids-reinforced soil. Firstly, according to parameters analysis, such as depth of first layer of geogrid, s, length of geogrid, L, layers of reinforcement, N, relative density of filling, and diameters, D, and embedment depth, H, of buried pipes, a series of loading tests have been carried out to investigate the protection performance for buried pipes. The tests results showed that the optimal protection performance for buried pipes under static loading can be obtained when u=0.4B, L=3D, N=2.Secondly, on the basis of loading tests, comparative analysis for a variety of condition are conducted between tests results and calculated results by numerical simulated. Finally, a reasonable design solution is proposed in this thesis for protection of buried pipes. |
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