EXPERIMENTAL STUDY ON HYDRAULIC FRACTURES IN COHESIVE SOIL GROUNDS BY SLURRY PRESSURE

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  • YUAN Dajun
    社団法人土木学会 早稲田大学大学院博士後期課程理工学研究科建設工学専攻
  • KOIZUMI Atsushi
    社団法人土木学会 早稲田大学理工学部土木工学科
  • MORI Akira
    社団法人土木学会 早稲田大学理工総合研究センター

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  • 泥水加圧による粘性土地盤の割裂状況に関する実験的研究
  • ドロミズ カアツ ニ ヨル ネンセイ ドジバン ノ カツレツジョウキョウ ニ カンスル ジッケンテキ ケンキュウ

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Abstract

Though many researches on the hydraulic fracture initiation pressure have been done for cohesive soil specimens, the hydraulic fracture phenomena in actual grounds are different from those in the laboratory. The main reason is that the extension of hydraulic fracture in actual ground may become very large. Therefore, we investigate hydraulic fracture initiation pressure and the fracture extending pressure in a field test by well bores. The extending speed of the hydraulic fracture was calculated from the injection rate of slurry into the hydraulic fracture space. The main objective was to investigate hydraulic fracture problems when the slurry type shield is used to excavate through cohesive soil ground. Therefore, in addition to the well bore test, hydraulic fracture experiments using a model slurry type shield were done. From both experimental results, the hydraulic fracture situation for an actual slurry type shield could be predicted.

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