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BEHAVIOR OF FLEXIBLE PIPE BURIRD IN LIME-TREATED RECYCLED SOID
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erving as important lifelines for the sustainability of urban society, underground water pipeline, and drainage and sewer pipeline system are yet having arising problems recently. In the relatively established city, over aged pipeline systems are found remaining underground and are subjected to environmental condition which causes the pipe to be deteriorated, while in developing area, cases of broken pipeline buried under traffic road have been reported frequently. Hence, renewal pipeline system projects are still being carried out along with new line construction projects. Both renewal pipeline project and construction of new pipeline project are having impact in environmental issue regarding the disposal problem of relatively low quality un-used soil from those projects. With the purpose to reduce this disposal impact and to put some of this surplus soil to good use, a treatment by mixing this soil with some amount of lime is being carried out recently in Tokyo sewer pipe construction project.In this research, series of unconfined compression test, triaxial test and suction measurement test have been conducted in order to observe the behavior of this limetreated
recycled soil and its original material. Remarkable increase of material stiffness by the addition of lime into the original material was observed. The result also showed that the shear strength of the specimen is a function of suction (water content), cohesion,
friction angle, effective strength, and structure of the specimen (e.g. density and initial water content when the specimen was compacted); which are observed to be affected by the addition of lime as well. By considering the fact that most of the broken water pipe cases occurred under traffic road, series of buried pipe model test under cyclic load has been performed to observe the soil-structure interaction between pipe and backfill soil under cyclic load. The PVC pipe as the model pipe was buried under lime-treated recycled soil in a small soil chamber. The ground surface displacement due to the cyclic load during the test was measured by an external displacement transducer, while two displacement transducers were used to measure the deflection of the buried pipe in vertical and horizontal direction. There were 4 gauges each on outer and inner surface of the pipe to measure the strain occurred on pipe surface, in addition to 8 attached load cells to measure the stress occurred on pipe surface in 8 locations. The backfill material was varied in term of density and water content. As comparison, model test of flexible pipe buried under the original material was carried out as well. In general, the ground surface displacement, pipe deflection and stress occurred on the pipe surface were found to be dependent on the stiffness of the backfill material. The addition of lime effect, water content effect and density effect were observed in the increase of backfill material stiffness. However, the effect of density was the clearest effect to dentify.
Cokorda Bagus Purnama Dwisa - Personal Name
NONE
electronic file
English
TESIS UNIVERSITY OF TOKYO 2009
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