• Title/Summary/Keyword: application in geotechnical engineering

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Application of GPR Technology for Detecting Bedrock under Conductive Overburden and Geological Survey (전도성 충적지반의 지질 및 하부 기반암 조사를 위한 지하레이다(GPR)의 적용)

  • 윤운상;배성호;김병철;김학수
    • Tunnel and Underground Space
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    • v.5 no.2
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    • pp.114-122
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    • 1995
  • The principle and applications of GPR(Ground Penetrating Radear) are familiar to engineering geologists and geophsicists as very attractive technique for continuous high resolution images of the subsurface. However, the main limitation of GPR is obviously related to presence of clayey or silty conductive soils, resulting in complete attenuation of radar signals. This difficulty gives hesitation for the exploration of the deeper targets for example detecting bedrock, particularly in Korean situation that most regions have conductive overburden. In order to prove usefulness of geological survey with GPR in that situation, the technique was tried to investigate depth of bedrock under thick conductive overburden and the other geolocgical informations for the constructionof foundation in the Dongbu apartment site, Kimhae. The reflection patterns on the processed GPR sections are well correlated with the geotechnical units-bedrock, alluvium, landfill unit and their internal layer-boundaries of boring data before GPR survey, except upper contact of bedrock. The isopach maps of the geotechnical units for the 3-D interpretations are made from GPR sections. The maps provided useful geological information that bedrock was distributed as plain and valley with 22~27m depth under alluvium unit (this depth is 5~8 m deeper than drill log) and sedimentary layers subsided and bended along growth fault with NNE strike/15$^{\circ}$SE dip in alluvium unit.

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Application of flat DMT and ANN for reliable estimation of undrained shear strength of Korean soft clay (국내 연약지반의 신뢰성있는 비배수 전단강도 추정을 위한 flat DMT와 인공신경망 이론의 적용)

  • Byeon, Wi-Yong;Kim, Young-Sang;Lee, Seung-Rae;Jeong, Eun-Taeg
    • Proceedings of the Korean Geotechical Society Conference
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    • 2004.03b
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    • pp.154-161
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    • 2004
  • The flat dilatometer test(DMT) is a geotechnical tool to estimate in-situ properties of various types of ground materials. The undrained shear strength is known to be the most reliable and useful parameter obtained by DMT. However, the existing relationships which were established for other local deposits depend on the regional geotechnical characteristics. In addition, the flat dilatometer test results have been interpreted using three intermediate indicesmaterial index($I_p$), horizontal stres index($K_p$), and dilatometer modulus($E_p$) and the undrained shear strength is estimated only by using the horizontal stress index($K_D$). In this paper, an artificial neural network was developed to evaluate the undrained shear strength by DMT and the ANN, based on the $p_0,\;p_1,\;p_2,\;{\sigma}'_v_0$, and porewater pressure. The ANN which adopts the back-propagation algorithm was trained based on the DMT data obtained from Korean soft clay. To investigate the feasibility of ANN model, the prediction results obtained from data which were not used to train the ANN and those obtained from existing relationships were compared.

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Evaluation of Mechanical Performance of a Segment Lining coated by a Sprayed Waterproofing Membrane by a Full-scale Loading Test (실물 재하실험에 의한 뿜칠 방수 멤브레인이 타설된 세그먼트 라이닝의 역학적 성능 평가)

  • Kang, Tae-Ho;Choi, Soon-Wook;Lee, Chulho;Park, Byungkwan;Kim, Jintae;Choi, Myung-Sik;Chang, Soo-Ho
    • Tunnel and Underground Space
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    • v.28 no.1
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    • pp.97-110
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    • 2018
  • The application of sprayed waterproofing membrane with high adhesion and ductility is considered to be promising as a measure for repair and reinforcement of a tunnel structure. Therefore, a powder-type and one-component membrane prototype with high tensile and bond strengths was made in this study. Then, its reinforcement effect on a shield segment was evaluated by carrying out a series of full-scale loading tests of segment specimens on which the membrane was sprayed. From the tests, it was confirmed that the initial cracking loads increased by approximately 34% due to cracking retardation by membrane coating. Even though the increase of failure loads were not so high as cracking loads, the strain-softening behaviors were observed from specimens coated by the membrane. Therefore, it is expected that the membrane coated on the inner surface of a lining might be effective in preventing its brittle failure.

Application of Resistivity/SP Monitoring Technique to Maintenance of Water Utilization Facilities (수리시설물의 유지관리를 위한 비저항/SP 모니터링기법 연구)

  • Park, Sam-Gyu;Kim, Jung-Ho;Seo, Goo-Won;Won, Jong-Geun;Kim, Byung-Ho
    • 한국지구물리탐사학회:학술대회논문집
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    • 2005.05a
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    • pp.71-76
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    • 2005
  • The subject of this paper is research into the application of resistivity/SP monitoring to detecting the water leakage of water utilization facilities. For this purpose, we installed a comprehensive monitoring system consisting of resistivity/SP measurement, inclinometer, piezometer, and water gauge at an embankment, Using this monitoring system, we monitored the various kinds of measurement data and compared the resistivity structures and SP variations that of hydrological and engineering data in order to investigate the water leakage and stability of the embankment. The variations of resistivity and SP at the embankment were provided from the monitoring data and we could accurately locate the portions of which resistivities and SP have sharply changed, Furthermore, we could estimate the stability of the embankment more effectively and quantitatively by jointly interpreting the monitoring data of resistivity and SP, water level, pore water pressure, and subsurface displacement. The monitoring experiments in this study led us to the conclusion that for the efficient maintenance of the water utilization facilities, monitoring the resistivity and SP data would be much more preferable to performing the just one-time measurements.

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Application of Electrical Resistivity Monitoring Technique to Maintenance of Embankments (저수지의 유지관리를 위한 전기비저항모니터링 기법 응용)

  • Park Sam Gyu;Kim Jung-Ho;Seo Goo Won
    • Geophysics and Geophysical Exploration
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    • v.8 no.2
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    • pp.177-183
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    • 2005
  • The subject of this paper is research into the application of electrical resistivity monitoring to detecting the water leakage of water utilization facilities. For this purpose, we installed a comprehensive monitoring system consisting of resistivity measurement, inclinometer, piezometer, and water gauge at an embankment. Using this monitoring system, we monitored the various kinds of measurement data and compared the resistivity structures and that of hydrological and engineering data in order to investigate the water leakage and stability of the embankment. The variant images of electrical resistivity at the embankment were provided from the monitoring data and we could accurately locate the portion of which resistivities have sharply changed. Furthermore, we could estimate the stability of the embankment more effectively and quantitatively by jointly interpreting the monitoring data of resistivity, water level, pore water pressure, and subsurface displacement. The monitoring experiments in this study led us to the conclusion that for the efficient maintenance of the water utilization facilities, monitoring the resistivity data and hydrological data would be much more preferable to performing the just one-time measurements.

Efficient Triangulation Algorithm for Constructing the Model Surface from the Interpolation of Irregularly-Spaced Laser Scanned Data

  • Shon, Ho-Woong
    • Journal of the Korean Geophysical Society
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    • v.8 no.3
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    • pp.153-157
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    • 2005
  • A discussion of a method has been used with success in terrain modelling to estimate the height at any point on the land surface from irregularly distributed samples. The special requirements of terrain modelling are discussed as well as a detailed description of the algorithm and an example of its application.

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Microstructure, mineralogy and physical properties: techniques and application to the Pusan Clay

  • Locat, Jacques;Tanaka, Hiroyuki
    • Proceedings of the Korean Geotechical Society Conference
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    • 1999.11b
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    • pp.15-31
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    • 1999
  • The Pusan Clay is analyzed hereafter from a point of view of mineralogy and microstructure. Results indicate that the Pusan Clay is basically illitic in nature and that the soil microstructure reveals some characteristics which could be responsible for its brittle behavior as observed from sample disturbance. The overall analysis would tend to consider that the Pusan Clay profile analyzed here shows mechanical properties similar to well structured soils or so-called cemented soils.

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Application Assessment of FRP Grouting Method (FRP보강 그라우팅공법의 적용성 평가)

  • 박종호;오명렬;이재덕;박용원
    • Proceedings of the Korean Geotechical Society Conference
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    • 2001.10b
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    • pp.60-76
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    • 2001
  • The grout-effect evaluation of the ground reinforcement technique, which has been widely applied to civil engineering and construction fields, is not established for the guidelines of choosing the efficient evaluation method, and in fact the expects have little effort to determine the reinforcement effect quantitively. This paper presents some results a field test performance of FRP pressure grouting method at a collapsed slope were carried out to verify the improving effect.

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Statistical Analysis of Geometric Parameters and Rock Conditions of Pick Cutters for Roadheaders (로드헤더용 픽커터의 형상변수와 암반조건에 대한 통계적 분석)

  • Soo-Ho Chang;Tae-Ho Kang;Chulho Lee;Soon-Wook Choi
    • Tunnel and Underground Space
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    • v.33 no.5
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    • pp.414-424
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    • 2023
  • In this study, a total of 326 data on a variety of geometric parameters of pick cutters and the corresponding cuttable rock conditions were collected and built as a database. Statistical analysis of the database showed that there is a significant positive correlation between the parameters that define the geometry of a pick cutter, especially between the parameters related to the length of a pick cutter and the geometry of a tungsten carbide insert. The diameter of a pick cutter shaft was also strongly correlated with the geometry of the inserts. On the other hand, it was difficult to find a clear correlation between the parameters for the rock conditions defined by the four conditions and the geometric parameters of pick cutters, which may be due to the uncertainty of the rock mass and the fact that the application of a pick cutter is presented as a range rather than a numerical single value. However, the mean values of geometric parameters of pick cutters tend to increase as a rock mass becomes harder. However, the pick length parameters are found to decrease as a rock mass becomes harder, which may be a way to reduce the moments that can occur when using long pick cutters in a hard rock condition.

Cast study on the Design Application of Final Settlement in Soft Ground (연약지반 최종침하량의 설계 적용성에 관한 사례연구)

  • Kim, Young-Su;Park, See-Boum;Kim, Kyung-Tae;Kim, Chang-Hyun;Kim, Hyun-Gu;Yook, Il-Dong;Kim, Hung-Gon
    • Proceedings of the Korean Geotechical Society Conference
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    • 2005.03a
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    • pp.948-955
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    • 2005
  • In this case of study, Incheon International Airport 2nd phase site preparation 1st section estimated final settlement to improve soft ground. Final settlement is very important in preloading method. Recently, Hyperbolic method, Hoshino method and Asaoka method are used mostly in prediction of final settlement and this paper, Comparing a result of Final settlement, used to Artificial Neural Network. The structure of Dynamic Artificial Neural Network which predicted Final settlement, has application to Young_Jong Island other site, If new investigation data will be added. Also, It is expected to save measuring_system cost in soft ground.

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