Laboratory study for pore water effect on hydraulically-induced fracture behavior in unconsolidated sands

Takatoshi Ito, H. Narita

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We developed recently a new apparatus which allows laboratory fracturing experiments under tn-axial compression up to 15 MPa with pore water pressure up to 15 MPa. Silica sands with particle size of about 125 im are used as the simulated formation matenals. In addition to the sand, some amount of kaolinite flour is mixed for adjusting permeability. The mixture is layered in a mold to form a cubical specimen of 200 x 200 x 200 mm3 with aid of a specially-designed press machine. A fracturing fluid with viscosity of 300 mPa s is injected into a specimen through a slit of a steel pipe buried in the specimen. After the tests, we excavate the specimen bit by bit and observe how the fracturing fluid has invaded into the specimen. In the present study, to examine the effect of pore water on the fracture formation, we carried out the tests for the specimens under various conditions of water saturation, pore pressure and confining stresses. Then we found that the fracturing pressure changes in proportion to the confining stress, and it is not influenced by water saturation and the initial value of pore pressure.

Original languageEnglish
Title of host publication48th US Rock Mechanics / Geomechanics Symposium 2014
EditorsLee Petersen, Ray Sterling, Emmanuel Detournay, Will Pettitt, Joseph F. Labuz
PublisherAmerican Rock Mechanics Association (ARMA)
Pages834-838
Number of pages5
ISBN (Electronic)9781634395236
Publication statusPublished - 2014 Jan 1
Event48th US Rock Mechanics / Geomechanics Symposium 2014: Rock Mechanics Across Length and Time Scales - Minneapolis, United States
Duration: 2014 Jun 12014 Jun 4

Publication series

Name48th US Rock Mechanics / Geomechanics Symposium 2014
Volume2

Other

Other48th US Rock Mechanics / Geomechanics Symposium 2014: Rock Mechanics Across Length and Time Scales
CountryUnited States
CityMinneapolis
Period14/6/114/6/4

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Fingerprint Dive into the research topics of 'Laboratory study for pore water effect on hydraulically-induced fracture behavior in unconsolidated sands'. Together they form a unique fingerprint.

  • Cite this

    Ito, T., & Narita, H. (2014). Laboratory study for pore water effect on hydraulically-induced fracture behavior in unconsolidated sands. In L. Petersen, R. Sterling, E. Detournay, W. Pettitt, & J. F. Labuz (Eds.), 48th US Rock Mechanics / Geomechanics Symposium 2014 (pp. 834-838). (48th US Rock Mechanics / Geomechanics Symposium 2014; Vol. 2). American Rock Mechanics Association (ARMA).