• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.1113-1118
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• 2004

Ballasted track is constructed in consideration of the maintenance. The application time and frequency of MTT(Multiple Tie Tamper) and BS(Ballast Cleaner) depend on track geometry measurements. This paper presents the application of Ground Penetrating Radar(GPR), Falling Weight Deflectometer(FWD), and Portable Ballast Sampler (PBS) to evaluate the effects of track geometry due to substructure deterioration and to build a reliable substructure evaluation system.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 춘계 학술발표회 논문집
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• pp.346-353
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• 2005

Track substructure(ballast, subgrade) should have sufficient strength and adequate stiffness to fully support track superstructure(rail, fastener, sleeper). Vertical support stiffness of track comes from the sufficient thickness, adequate strength and stiffness of material of substructure layers. Since the vertical support stiffness of track substructure is closely related with the track geometry, the evaluation of the stiffness is very important to understand the track states. This paper introduces the system, which are composed of Ground Penetrating Radar(GPR), Portable Ballast Sampler(PBS), and Light Falling Weight Deflectometer(LFWD), to evaluate substructure condition and summarizes the field test results performed with the reliable system.

• 한국지반공학회논문집
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• 제21권5호
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• pp.163-170
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• 2005

궤도상부(레일, 체결구, 침목)를 완전하게 잘 지지하기 위해서는 궤도하부(도상, 노반)가 충분한 강도를 가지고 균질한 강성을 가져야 한다. 궤도의 수직지지강성은 궤도하부의 상태(세립분 함량, 함수비)에 크게 영향을 받는다. 따라서 궤도의 수직지지강성을 평가하기 위하여 궤도하부의 상태를 평가하는 것은 매우 중요하다. 본 논문에서는 궤도하부의 상태를 진단할 수 있는 GPR/PBS/LFWD로 구성된 궤도기초상태평가법을 제안하였다. 제안된 궤도기초 상태평가법의 적용성을 평가하기 위하여 실내 실험 및 현장시험을 수행하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 춘계학술대회 논문집
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• pp.980-986
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• 2004

So far systematic and reliable methods for the investigation of track substructure (ballast and subgrade) are not developed yet. This study presents the applicability of GPR (Ground Penetrating Radar) and PBS (Portable Ballast Sampler) to the evaluation of railway trackbed conditions. Including FWD (Falling Weight Deflectometer) often used to evaluate the subsurface conditions of pavement, the standard system for assessing trackbed conditions will be developed in the future.