Abstract
Background:The demand for underground space utilization using pipe jacking method is increased especially in the congested urban area.Methods:In the method, the over-cutting area is formed between pipes and surrounding soils in order to smoothly construct underground pipelines. The backfilling materials as a lubricant are injected into the over-cutting area during the constructions in order to reduce the friction resistance and to sustain the surrounding ground against the overburden pressure. Therefore, the performance of lubrication for backfilling material is significant. In this study, the fatty acids are added into the backfilling material to improve the lubrication performance.Conclusion:Laboratory studies have shown that the bleeding rate is reduced with the increase in addition ratio of fatty acids, however, the excess addition may cause the shrinkage of the backfilling material due to the effect of water absorption from the pipe. Additionally, 3% addition of fatty acids into the conventional backfilling material is the most effective to reduce the thrust for pipe jacking based on the results of the direct shear tests.
Highlights
In recent years, infrastructure utilizing the underground space has actively constructed along with the overcrowding of urban areas
It is considered that the bleeding rate decreases with the addition of fatty acids since they have a lower density than other materials
The fatty acids addition ratio of 2% or more is effective to reduce the thrust until the 7 days since the thrust is constant
Summary
Infrastructure utilizing the underground space has actively constructed along with the overcrowding of urban areas. In the development of the underground infrastructure, the pipe jacking method is applied in many cases because the area occupied on the ground is small and the noise of the surrounding is minimized [1, 2]. The over-cutting area is formed between the pipes and surrounding soils in order to smoothly construct underground pipelines. The backfilling materials are injected into the over-cutting area as a lubricant to avoid contact with the surrounding soil and to reduce the friction [5, 6]. The demand for underground space utilization using pipe jacking method is increased especially in the congested urban area
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