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A DESIGN FOR HORIZONTAL RESISTANCE OF PILES IN THE GROUND IMPROVED BY VACUUM CONSOLIDATION METHOD

A DESIGN FOR HORIZONTAL RESISTANCE OF PILES IN THE GROUND IM...

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中日岩土工程学术会议

作者： KOUICHI TOMISAWA satoshi nishimoto Chief Research Engineer Geotechnical Division Civil Engineering Research Institute of HokkaidoHiragishi 1-3-1-34Toyohira-kuSapporo 062-8602Japan Director Geotechnical Division Civil Engineering Research Institute of HokkaidoHiragishi 1-3-1-34Toyohira-kuSapporo062-8602Japan

＜正＞ This paper presents a study of a design method for improving the ground around piles using the vacuum consolidation method, one of various ground improvement methods, and using the increased ground strength to reflect onto the horizontal resistance of piles. This is a rational design method that can reduce construction costs for site conditions with soft ground, where horizontal resistance determines pile specifications. In this design method, the range of influence of the horizontal resistance, or the range of ground improvement requiring the vacuum consolidation method, is set from 1/β(the characteristic length of piles: （?） to the range of passive earth pressure, θ=45°+（?）/2. The horizontal subgrade reaction of piles is determined by converting the shear strength C of ground, increased by consolidation, to the modulus of deformation E. The validity of the design method was empirically verified by applying it to an actual site and conducting horizontal loading tests on actual piles. The seismic behavior of the piles in the improved ground was examined using the conventional earthquake-resistant design method.

关键词： Lateral Resistance Of Pile Vacuum Consolidation Method Load Test Seismic Design

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STRENGTH CHARACTERISTICS OF "CRUSHED SOLIDIFIED SOIL"

STRENGTH CHARACTERISTICS OF "CRUSHED SOLIDIFIED SOIL"

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中日岩土工程学术会议

作者： ATSUKO SATO satoshi nishimoto TERUYUKI SUZUKI Senior Research Engineer Geotechnical Division Civil Engineering Research Institute of HokkaidoHiragishi 1-3-1-34Toyohira-kuSapporp062-8602Japan Director of Geotechnical Division ditto Department of Civil Engineering Kitami Institute of TechnologyKoencho 165KitamiJapan

＜正＞ Soils generated as byproducts of construction are used in other projects. When such soils are to be used for embankments but are unsuitable for such use, they must be solidified first. When solidifying agents are added, the gain in strength appears shortly thereafter, but there are cases where banking cannot be done within the prescribed time after mixing with solidifying agent, due to sudden changes of work schedule or weather. The solidified soil must then be crushed and compacted before use. The strength characteristics of such soil are unclear. To clarify the strength characteristics of soil that has been mixed with solidifying agents, cured for a certain period, crushed and then compacted （"crushed solidified soil"）, we conducted several laboratory tests in which the time elapsed between the addition of solidifying agent to soil and crushing was varied. The lest results showed that the strength of crushed solidified soil could be estimated from the strength of solidified soil. Also, the tests showed that the cone index of crushed solidified soil is greatly affected by the time elapsed between the addition of solidifying agents and crushing. However, unconfined compressive strength, cohesion and California Bearing Ratio （CBR） of crushed solidified soil did not greatly change from one day of elapsed time onward.

关键词： Crushed Solidified Soil Strength Characteristics Leaving Time Stabilization Effective Use

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