• Title/Summary/Keyword: Rock Cut Slopes

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Failure Characteristics of Cut Slopes in Sedimentary Rock of Kyongsang Basin (경상분지 퇴적암 절취사면의 붕괴특성)

  • 유병옥;황영철;정형식
    • Proceedings of the Korean Geotechical Society Conference
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    • 1999.03a
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    • pp.339-346
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    • 1999
  • The stability of rock slope is considered to have a deep relation with types of rocks because types of rocks have their own typical weathering profiles, geological structures and characteristics of failures. Therefore it is essential for the evaluation of rock slope stability to analyze geological and engineering characteristics in rock mass. The data which collected from investigated slopes in sedimentary rock of Kyengsang Basin along highways were analyzed. Primary factors affecting slope stability in rock mass are: dips and strikes of slopes and discontinuities, shear strength of discontinuities, slope geometry and geological structures etc.

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Failure Characteristics of Cut Slopes of Shale in Ky ngsang Basin (경상분지 셰일 지역에서의 절토사면 파괴 특성)

  • 김경석;유병옥;이상돈
    • Proceedings of the Korean Geotechical Society Conference
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    • 2002.11b
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    • pp.103-114
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    • 2002
  • Stability of cut-slope is considered to have a deep relationship with rock types since rock has its own engineering and geological characteristic such as shear strength, durability, weathering profile, geological structures. Therefore, analysis of geological and engineering characterisics of rock mass is essential for the evaluation of rock slope stability This paper introduces the statistical data of slope failure cases which was collected from highway slopes constructed in sedimentary rock mainly of shale in Ky ng-sang Basin. Primary failure feature in this area is planar failure along the bedding regardless of slope geometry. Even a disasterous slope failure case due to the thick clay layer between the beddings was reported. Failures and rock fall were reported to ocurred frequently after the completion of cutting due to the weathering, so long-term slope stability should be considered as a important factors in design.

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Development of Rock Slope Risk Rating System for the Determination of the Priority of Investment (도로절개면 투자우선순위 결정기법 개발)

  • 구호본;박혁진;민기복;정의진;김춘식;박성욱
    • Proceedings of the Korean Geotechical Society Conference
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    • 2000.03b
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    • pp.411-418
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    • 2000
  • With the limited amount of budget and time, it is required to determine the priority of investment when there are a large number of hazardous slopes. In this paper, the Rock Slope Risk Rating System is developed based on the combination of the hazard of failure and the damage potential. By applying the proposed rating system to 253 rock slopes in Korean National Highway, it was possible to determine the priority of investment on road cut slopes.

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Soft Sedimentary Rock Slopes Design of Diversion Tunnel

  • Jee, Warren Wangryul
    • Proceedings of the Korean Society for Rock Mechanics Conference
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    • 2007.10a
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    • pp.63-79
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    • 2007
  • Several remedial works were attempted to stabilize the collapsed area of the inlet slopes of diversion tunnel, but prevention of any further movement was being only carried out at beginning stage by filling the area with aggregates and rock debris, after several cracks had been initiated and developed around the area. The extra specialty developed folding zone is consisted with highly weathered Greywacke and Black shale. The suggested solution is to improve the properties of the rock mass of failed area by choosing the optimum level of reinforcement through the increment of slope rock support design so as to control the movement of slopes during the re-excavation. The Bakun hydroelectric project includes the construction of a hydroelectric power plant with an installed capacity of 2,520MW and a power transmission system connecting to the existing transmission networks in Sarawak and Western Malaysia. The power station will consist of a 210m height Concrete Faced Rockfill Dam. During the construction of the dam and the power facilities the Balui River has to be diverted of the tunnels is 12m and the tunnel width is 16m at the portal area. This paper describes the stability analysis and design methods for the open cut rock slopes in the inlet area of the diversion tunnels. The geotechnical parameters employed in stability calculations were given as a function of four defined Rock Mass Type (RMT) which were based on RMR system from Bieniawski. The stability calculations procedure of the rock slopes are divided into two stages. In the first stage, it is calculated for the stability of each "global" slope without any rock support and shotcrete system. In the second stage, it is calculated for each "local" slope stability with berms and supported with rock bolts and shotcrete. The monitoring instrumentation was performed continuously and some of the design modification was carried out in order to increase the safety of failed area based on the unforeseen geological risks during the open cut excavation.

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Development of Database System(DB/SLOPE) for Management of Cut Slope in Highway (고속도로 절토사면 관리를 위한 데이타베이스 프로그램 개발)

  • 유병옥;황영철
    • Tunnel and Underground Space
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    • v.11 no.3
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    • pp.206-216
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    • 2001
  • Many failures in cut slopes occur during and following road construction. Failures are caused, in part, by a lack of understanding of the characteristics of rock mass including its geologic structure. The stability of rock slopes is closely related to factors that include the type of rock, development of geological structures, weathering, characteristics of rock, and the shape of the geologic features. Therefore, it is very important to consider these characteristics of rock mass in the evaluation of rock slope stability. In spite of investigation from many slope failures, these information data were not systematically stored and not efficiently utilized. In this study, a Database system named DB/SLOPE was developed using Oracle for systematic management of cut slopes. The developed database system can be used to estimate of slope stability and to predict of slope failure.

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Characteristics of the Cut Slopes located in Mt. Jang Area, Busan (부산 장산지역에 분포한 절개사면의 특성)

  • Song, Young-Suk;Kim, Kyeong-Su;Cho, Yong-Chan;Lee, Choon-Oh;Chae, Byung-Gon
    • Journal of the Korean Geosynthetics Society
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    • v.12 no.3
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    • pp.65-73
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    • 2013
  • The information of cut slope in Mt. Jang area, Busan is investigated in order to construct the Slope Management System in Urban Area. The slope inspection sheet is made to record the characteristics for cut slopes, and that is capable to be inputted slope information systematically. The cut slopes in Mt. Jang area are consisting of 69 slopes. Most of the cut slopes are constructed in cutting slope and retaining wall (CR). The cut slopes located in housing facilities are 46 slopes, and the slopes located in school facilities are 12 slopes. The traverse of cut slopes is mainly ranged from 50 m to 150 m, and the height is mainly ranged from 10 m to 20 m. The slopes combined with soil and rock are mostly distributed. The retaining wall was installed in the toe part of cut slope in order to increase the slope stability, and the additional reinforcement methods including the anchor, drainage, preventing rock fall, shotcrete and vegetation were installed at the toe part of cut slopes.

A Case Study of the Rock-fall Signal Lamp System for Preventing the Damage at the Cut-Slopes (사면붕괴 피해 예방을 위한 낙석신호등 설치 사례 연구)

  • Kim, Seung-Hyun;Koo, Ho-Bon;Rhee, Jong-Hyun;Baek, Yong
    • The Journal of Engineering Geology
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    • v.17 no.2 s.52
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    • pp.253-261
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    • 2007
  • The failure of the road cut-slope due to heavy rains brings about lots of injuries and damage on national properties. KICT has developed CSMS system by means of prevention to manage the dangerous cut slopes. In spite of the continuous management the frequency of cut-slopes failure is increasing the past due to changes of earth-environment. KICT has installed the "Real-Time Monitoring System" on dangerous slopes. The operation of Real-Time Monitoring System is used as a positive system to reduce injuries and damages. However, Although the slope manager is aware of the signs collapsed in advance, it has temporal and spatial limits until the slope manager performs the works which are preventing the accidents. When real time monitoring system finds out an indication of slope collapse, the Rock-fall Signal Lamp System makes road-users indicated the risk of cut slopes. It is a kind of prevention system that it will minimize the damages of the properties as suspension of traffic automatically or passively.

Application Case of Test of Revegetation Measures on Design of Slopes Revegetation and Tentative Instruction on Construction Work -With a Case of Slopes Along the National Road Between Nongseo and Eomo - (비탈면 녹화 설계 및 시공 잠정 지침 적용사례 -농소어모구간 국도비탈면을 중심으로-)

  • Jeon, Gi-Seong
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.10 no.4
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    • pp.95-108
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    • 2007
  • Test application of revegetation measure was made on the roadside slope damaged by Nongseo-Eomo national road improvement project in a bid to prevent the soil from being washed out as well as to restore the ecological environment, and the survey for assessment of the effect of slope revegetation measures was conducted, beginning May 11 through Nov 7, 2006. In the wake of comprehensive reviewing and evaluating the surrounding topographic environment, physical and chemical characteristics of soil, germination of revegetation plants, analysis of bio mass, covering ratio and the plants appeared, measure b was found to have been most appropriate to cut blasting rock slope, and alternatively measure c. For cut ripping rock slope, measure c-1 appeared to be effective in revegetation effect, and alternatively, b-1.When it comes to cut soil slope, measure c-2 was found to be effective, and b-2 to be a good alternative. And for embankment soil slope, measure b-3 appeared to be most efficient in revegetation effect and measure f as alternative.

Characteristics of Several Korean Native Herbaceous Plants for Cut Slope Revegetation (몇 가지 자생 초화류의 사면녹화 특성)

  • Song, Jeong-Seob;Chang, Young-Deug;Lee, Sang-Jeong;Bang, Chang-Seok;Huh, Kun-Yang;Chung, Meyong-Il;Chung, Hyun-Hwan
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.8 no.1
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    • pp.10-16
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    • 2005
  • This experiment was conducted to study on application of several Korean native plants by seed spray methods for cut slope revegetation, and possibility of replacement almost imported tall fescue seeds by native herbaceous plants. So, we investigated growth and covering rate after sowing native plants seeds at the artificial slope plots in Suwon and the rock exposed cut-slopes in Wonju city. Emergence rate after seed spray at artificial slopes were higher Elsholtzia splendens and Dianthus superbus var. longicalycinus, showing the highest in E. splendens. Also, E. splendens, D. superbus var. longicalycinus, and Agrostemma coronaria were possible to use for seed spray at the rock exposed cut-slopes. The plots of mixed native plants show more seasonal scenery than that of tall fescue. Soil surface run-off by Typhoon was less in plot sown native plants than those of lawn grass, resulting fresh weight of roots was heavier. Thus, we found that the mixed seed spray of several native herbaceous plants, E. splendens, D. superbus var. longicalycinus, and Agrostemma coronaria, were well covered the slopes as tall fescue.

Development of a New Direct Shear Apparatus Considering the Boundary Conditions of Rock Joints (암반의 경계조건을 고려한 절리면 직접전단시험기 개발)

  • 이영휘;김용준
    • Journal of the Korean Geotechnical Society
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    • v.19 no.2
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    • pp.147-157
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    • 2003
  • The characteristics of a rock joint which influence the stability of rock mass structures such as cut slopes and tunnels are largely controlled by the conditions of the rock joint as well as its boundary conditions. The conditions of rock joints comprise asperity strength, roughness, and filling materials. Boundary conditions can be represented by assuming that the deformability(or stiffness) of the rock mass surrounding the joints is modelled by a spring with stiffness. A new direct shear apparatus was developed in this study, which adapts a servo control system using PID algorithm. This apparatus can be used to investigate the various aspects of shear characteristics of the rock joints at conditions of constant normal stress and constant normal stiffness and so on. The test results for saw-cut teeth joints show that shear strength should be evaluated by considering its specific boundary conditions far the design of tunnels and cut slopes.