Evaluation of Excavation Characteristics of a Vibratory Ripper Based on Field Excavation Tests

Mingyu Kim; Jahe Jung; Chulho Lee

doi:10.12814/jkgss.2026.25.3.065

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2026 Vol.25, Issue 3 Preview Page Next Page

Research Article

Evaluation of Excavation Characteristics of a Vibratory Ripper Based on Field Excavation Tests 현장 굴착시험을 통한 진동 리퍼의 굴착 특성 평가

30 September 2026. pp. 65-77

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Abstract

This study evaluated the field excavation performance and applicability of an excavator-mounted vibratory ripper through field excavation tests conducted at five test sites in an open-pit quarry in Dangjin, Chungcheongnam-do, Korea, under identical equipment and operator conditions. Excavation volumes and hourly excavation productivity based on net excavation time were determined from 3D laser scanning of the ground surface before and after excavation, and the borehole-averaged uniaxial compressive strength (UCS) and rock quality designation (RQD) obtained from boreholes at each excavation location were examined in relation to the measured productivity. Image-based fragmentation analysis was performed on the excavated rock to compare fragment size characteristics among the test sites, and noise and ground vibration generated during excavation were measured at selected sites approximately 10m from the vibratory ripper and compared with the domestic regulatory limits for construction noise and vibration. The excavation productivity ranged from 15.05 to 65.97m³/hr, showing an approximately fourfold difference among the test sites under identical equipment conditions, but this variation could not be consistently explained by the borehole-averaged UCS (59.19–163.99MPa) and RQD (58.7–85.0%) alone, which is attributed to the limited ability of borehole indices averaged over a 10m depth to represent the local strength and discontinuity conditions of the shallow rock mass actually excavated. The fragmented rock exhibited relatively uniform size distributions regardless of the test site, with D50 of 116.32–239.87mm and Rosin–Rammler uniformity indices of 1.91–2.28. Ground vibration measured at 10m remained within the regulatory limits, with a maximum peak vector sum of 2.97mm/s and vertical vibration levels (L10) of 58.50–62.35dB(V), whereas the equivalent continuous sound levels of 81.58–83.73dB(A) exceeded the limits, indicating that sufficient separation distance or noise mitigation is required. By integrating the measured productivity, rock mass properties, fragmentation characteristics, and noise and vibration results, this study evaluates the field performance and applicability of the vibratory ripper and presents the validity and limitations of borehole-based rock mass indices for productivity prediction.

Keywords

Vibratory Ripper

Rock Excavation

Field Test

Productivity

Rock Mass Characteristics

본 연구에서는 굴삭기 어태치먼트형 진동 리퍼의 현장 굴착성능과 적용특성을 평가하기 위하여 발파 채석이 진행 중인 충청남도 당진의 노천광산 내 5개 시험지점에서 동일한 장비와 작업자 조건으로 현장 굴착시험을 수행하였다. 굴착 전·후 지형을 3D 레이저 스캔으로 측정하여 시험지점별 굴착체적과 순굴착시간 기준의 시간당 굴착생산량을 산정하였으며, 굴착시험과 동일한 위치의 시추공에서 확보한 시추공 평균 UCS와 RQD를 이용하여 암반특성과 굴착생산량의 관계를 검토하였다. 또한 굴착 후 형성된 파쇄암을 대상으로 영상 기반 입도분석을 수행하여 시험지점별 파쇄입도 특성을 비교하였으며, 일부 시험지점에서는 진동 리퍼로부터 약 10m 이격된 위치에서 굴착 중 발생하는 소음과 지반진동을 계측하여 생활소음·진동 규제기준과 비교하였다. 시험 결과 굴착생산량은 15.05~65.97m³/hr로 동일한 장비조건에서도 시험지점 간 약 4배의 차이를 보였으나, 시추공 평균 UCS(59.19~163.99MPa)와 RQD(58.7~85.0%)만으로는 이러한 차이를 일관되게 설명할 수 없었다. 이는 심도 10m 구간을 평균한 시추공 지표가 실제 굴착이 이루어진 천부 암반의 국부적인 강도와 불연속면 조건을 충분히 반영하지 못하기 때문으로 판단된다. 파쇄암의 D50은 116.32~239.87mm, Rosin–Rammler 분포형상지수 n은 1.91~2.28로 시험지점에 관계없이 비교적 균일한 입도분포를 나타내었고, 10m 이격거리에서 계측한 지반진동은 PVS 최대 2.97mm/s, 수직방향 진동레벨 L10 58.50~62.35dB(V)로 규제기준 이내였으나 등가소음도는 81.58~83.73dB(A)로 기준을 상회하여 이격거리 확보 또는 방음대책이 필요한 것으로 나타났다. 본 연구는 실제 암반조건에서 측정된 굴착생산량과 암반특성, 파쇄입도 및 소음·진동 결과를 종합하여 진동 리퍼의 현장 굴착성능과 적용특성을 평가하고, 시추코어 기반 암반지표를 이용한 생산량 예측의 유효성과 한계를 제시하였다.

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Information

Publisher :Korean Geosythetics Society
Publisher(Ko) :한국지반신소재학회
Journal Title :Journal of the Korean Geosynthetics Society
Journal Title(Ko) :한국지반신소재학회 논문집
Volume : 25
No :3
Pages :65-77
Received Date : 2026-09-09
Revised Date : 2026-09-15
Accepted Date : 2026-09-15
DOI :https://doi.org/10.12814/jkgss.2026.25.3.065

Journal of the Korean Geosynthetics Society ISSN:2508-2876(Print) 2287-9528(Online) 한국지반신소재학회 논문집

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