透水性の評価方法

Evaluation method for permeability

Abstract

【課題】ルジオン試験の後に連続して測定が可能で、短時間に現場で透水性を定量的に評価することが可能な透水性の評価方法を提供する。 【解決手段】透水試験装置1を用いて評価対象区間12に水を圧入し、所定の圧力にする。水の供給を停止すると同時に、バルブ7を閉じて評価対象区間12内を閉鎖する。評価対象区間12内の所定の圧力から所定の度合いだけ低下するまでの経過時間Ttを測定する。また、複数の透水係数Kcを設定し、これらの各透水係数Kcにおける評価対象区間内の圧力と経過時間Tcとの関係を算出して、所定の度合いだけ低下するまでの経過時間Tcと各透水係数Kcとの関係を図示する。経過時間Ttに対応する透水係数Kcを図から読み取り、この値を評価対象区間内の透水係数Ktとする。 【選択図】図7
<P>PROBLEM TO BE SOLVED: To provide an evaluation method for permeability, which can continuously measure the permeability after a Lugeon test, and which quantitatively evaluates the permeability on a job site in a short period of time. <P>SOLUTION: Water is pressed into an evaluation object section 12 by means of a permeability test apparatus 1, so that predetermined pressure can be set. The inside of the evaluation object section 12 is closed by closing a valve 7, concurrently with the stop of water supply. An elapsed time Tt until a decrease by a predetermined degree from the predetermined pressure in the evaluation object section 12 is measured. A plurality of coefficients Kc of permeability are set; a relationship between an elapsed time Tc and the pressure in the evaluation object section for each of the coefficients Kc is computed; and a relationship between each of the coefficients Kc and the elapsed time Tc until the decrease of the pressure by the predetermined degree is shown in the drawing. The coefficient Kc corresponding to the elapsed time Tt is read from the figure, and this value is set as a coefficient Kt of permeability in the evaluation object section. <P>COPYRIGHT: (C)2008,JPO&INPIT

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Patent Citations (1)

    Publication numberPublication dateAssigneeTitle
    JP-2002004257-AJanuary 09, 2002Nittoc Constr Co Ltd, 日特建設株式会社Permeability test method and device therefor

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