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水力破裂試驗評估砂土之水平應力
Date Issued
2000
Date
2000
Author(s)
左天雄
DOI
892211E002060
Abstract
Hydraulic fracture tests (HFT) can be
used to evaluate the coefficients of lateral
earth pressure at rest K0 of cohesive soils at
laboratory and field test sites.
This study shows that the total
horizontal stresses of cohesive soils obtained
by HFT are decreasing to stable values after
the embedment of hydraulic fracture cones and
are consistence with those derived by flat
dilatometer tests (DMT).
The closure pressures of HFT of
cohesionless soils may not be assessed due to
the property of high permeability. This study
presents that injecting bentonite fluid to
form impervious slurry wall around the shaft
of hydraulic cone can decrease the
permeability of cohesionless soils. Then the
laboratory HFT of sands shows that vertical
hydraulic planes may be developed and total
horizontal stresses can be evaluated by
closure pressures.
The test results of field HFT in sandy
soils shows that the total horizontal stresses
evaluated by HFT have consistency with those
assessed by DMT and CPT.
used to evaluate the coefficients of lateral
earth pressure at rest K0 of cohesive soils at
laboratory and field test sites.
This study shows that the total
horizontal stresses of cohesive soils obtained
by HFT are decreasing to stable values after
the embedment of hydraulic fracture cones and
are consistence with those derived by flat
dilatometer tests (DMT).
The closure pressures of HFT of
cohesionless soils may not be assessed due to
the property of high permeability. This study
presents that injecting bentonite fluid to
form impervious slurry wall around the shaft
of hydraulic cone can decrease the
permeability of cohesionless soils. Then the
laboratory HFT of sands shows that vertical
hydraulic planes may be developed and total
horizontal stresses can be evaluated by
closure pressures.
The test results of field HFT in sandy
soils shows that the total horizontal stresses
evaluated by HFT have consistency with those
assessed by DMT and CPT.
Subjects
in-situ soil stresses
hydraulic fracture test
penetration tests
Publisher
臺北市:國立臺灣大學土木工程學系暨研究所
Coverage
計畫年度:89
第一期;起迄日期:1999-08-01/2000-07-31
第一期;起迄日期:1999-08-01/2000-07-31
Type
report
File(s)
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Format
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