• Title/Summary/Keyword: depth test

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Characteristics of Undrained Shear Strength of Yangsan Clay (양산지역 점토의 비배수 전단강도 특성)

  • 김길수;임형덕;이우진
    • Proceedings of the Korean Geotechical Society Conference
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    • 2000.02a
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    • pp.71-78
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    • 2000
  • SHANSEP method involves the consolidation to stresses in excess of the preconsolidation pressure in order to overcome sample disturbance effect. The concept of SHANSEP is based on an approach to laboratory test which attempts to reproduce the in-situ conditions more closely than is possible in routine tests and evaluates normalized strength parameters for the soil as a function of OCR. But SHANSEP method can be applied only to fairly uniform clay deposits, and is unsuitable for a random deposit. In this study, CK/sub o/U triaxial compression test and incremental loading consolidation test were performed for the application of SHANSEP method on Yangsan clay. During the K/sub o/-consolidation, triaxial specimens were consolidated to stress equal to two times the in-situ vertical effective stress. And for overconsolidated condition, the specimens were swelled to a known vertical effective stress in order to have the desired OCR. With the results of CK/sub o/U triaxial compression test using the block samples, the relationship between c/sub u//σ/sub vc/' and OCR on Yangsan clay was established. For evaluating the undrained shear strength of Yangsan clay with depth, CK/sub o/U triaxial compression test was performed using the piston samples taken from Yangsan site. And also undrained shear strength was analyzed from the in-situ test such as Cone Penetration Test(CPT), Dilatometer Test(DMT), and Field Vane Test(FVT) and was compared with that of CK/sub o/U triaxial compression test.

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A Study on Lateral Loading the Field Test of Pile for Large Diameter Drilled Shaft Pile (대구경 현장타설말뚝에 대한 현장수평재하시험에 관한 연구)

  • Choi, Yong-Kyu;Lee, Min-Hee;Lee, Chung-Sook
    • Journal of the Korean GEO-environmental Society
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    • v.5 no.2
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    • pp.33-39
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    • 2004
  • Most of pile foundations are a condition of fixed head on pile, but lateral loading test of pile have performed to free head on generally. This study performed field lateral loading test accompanying lateral displacement by depth of pile for two cases(fixed head and free head) and analyzed lateral behavior of large drilled shaft. Furthermore compared theoretical equation with result of lateral loading test.

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Rock Permeability Estimation from Hydraulic Injection Tests in a Sealed Borehole Interval

  • Quach, Nghiep Q.;Jo, Yeonguk;Chang, Chandong
    • The Journal of Engineering Geology
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    • v.28 no.1
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    • pp.1-9
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    • 2018
  • We propose a borehole test technique to estimate permeability of rocks in borehole. The borehole tests are hydraulic injection tests such as leak-off test and hydraulic fracturing tests, which are originally conducted for stress or casing integrity assessment and not for permeability measurement. We use one-dimensional radial diffusion equation to interpret fluid injection test results in terms of permeability. We apply this technique to a leak-off test conducted at a depth of 700 m in a wellbore, where rock formation is mudstone. The estimated permeability is at an order of $10^{-16}m^2$, which is somewhat high but within the range reported for mudstones previously. Quantitative rick assessment suggests that an accurate measurement of open hole section length is important to improve reliability of results. More data may be needed to ensure the reliability of this technique. If validated, however, this technique can provide cost-effective estimation of in situ permeability without conducting independent permeability tests in borehole.

Development of the Hovering AUV test-bed and field test

  • Choi, Hyeung-Sik;Cho, Sohyung;Kim, Joon-Young
    • Journal of Advanced Research in Ocean Engineering
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    • v.2 no.1
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    • pp.40-47
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    • 2016
  • This paper describes the design and performance of a hovering AUV constructed at KMOU (Korea Maritime and Ocean University). Before the field test, we analyzed the dynamic performance of the AUV using a simulation program made by Matlab & Simulink. Also, a PID controller was designed to control the thrusters. Using 4 thrusters (2 vertical and 2 horizontal), the AUV could be controlled using dynamic motion with 4-DOF. A simulation and field test were conducted with way-point tracking, maintaining the desired depth. To perform way-point tracking, the AUV can be fine-tuned to the desired heading angle through the LOS (Line Of Sight) method. This paper shows the results of simulation and field tests.

Investigation of the Hydraulic Stability of Agricultural Drainage Channels Installed Water Purification Materials by using Flow-3D (Flow-3D를 활용한 수질정화체가 설치된 농업용 배수로의 안정성 조사)

  • Kim, Sun-Joo;Park, Ki-Chun
    • Journal of The Korean Society of Agricultural Engineers
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    • v.49 no.5
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    • pp.3-9
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    • 2007
  • In this study, the effect of the purification materials is analyzed and tested by Flow 3D and Hydraulic model test. Three dimension numerical analysis led from the research that sees abnormal form and the size back of the water purification material conferred the flowing water conduct inside the test channel against the test condition. Comparison it analyzed the flux distribution, a water depth of the channel which establishes the water purification materials the cross section, an interval of the water purification material, a conference with general channel, it change executed. As a result, the cross section ratio of the purification materials against and a flux change from the test which it sees. The interval of the purification materials in order to prevent three dimension that follows in decrease of increase and flux must decide an interval.

Evaluation of Durability Properties of Cement Matrix Using the Polymer of Powder Type (분말형 폴리머를 사용한 시멘트 경화체의 내구성 평가)

  • Kim, Seong-Soo;Jung, Ho-Seop;Lee, Jeong-Bae;Yoon, Ha-Young;Koh, Joon-Ho
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.11a
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    • pp.495-498
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    • 2005
  • It was investigated the durability of the concrete to improve construction materials with polymer cement mortar in this study. With the popularity of repair and rehabilitation material, some mixtures composed of Ethylene Vinyl Acetate(EVA) was studied. Ethylene Vinyl Acetate(EVA) carried out tests to determine its properties which a include: freezing-thawing resistance test, carbonation test, and chemical resistance test. Result of freezing-thawing resistance test, mass change ratio and chemical resistance test, mass change ratio decreased of 12 and $15\~45\%$ as compared with control mortar. Carbonation depth decreased $3.7\~5.6mm$ as polymer-cement ratio increased $1\~4\%$.

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A Study on Static Lateral Loading Test for Large Diameter Drilled Shaft Pile Considering the Pile Lead Fixity Conditions (말뚝두부구속조건을 고려한 대구경 현장타설말뚝에 대한 수평정재하시험 연구)

  • Lee, Min-Hee;Hwang, Geun-Bae;Jung, Sung-Min;Choi, Yong-Kyu
    • Proceedings of the Korean Geotechical Society Conference
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    • 2004.03b
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    • pp.36-43
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    • 2004
  • Most of pile foundations are fixed head condition, but lateral loading test for pile is performed under free head condition generally In this study, a lateral loading test for a large diameter drilled shaft was performed under the fixed pile head and the free pile head condition, where lateral displacement along the pile depth was measure. Test results and theoretical values were compared and analyzed.

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The Strength Evaluation of Wheel for Railway Rolling Stock Using Instrumented Indentation Test (계장화 압입시험을 이용한 차륜의 강도평가)

  • Kim, Chul-Su;Ahn, Seung-Ho;Chung, Kwang-Woo;Park, Shin-Ho;Kang, Gil-Hyun
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.1607-1612
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    • 2007
  • To assure safe usage of railway rolling stock, it is important to evaluate the strength of the wheel which is core part in bogies. However, conventional standard testing methods using destructive technique could not evaluate mechanical properties of degraded wheels during rolling stock maintenance work. Instrumented indentation test is a new way to evaluate nondestructively the strength of mechanical components by analyzing indentation load-depth curves. In this study, to evaluate tensile strength of the wheel, instrumented indentation test is performed nondestructively according to KS B 0950. Furthermore, test results are examined by tensile test in accordance with KS R 9221.

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Development of a Test-Bed Autonomous Underwater Vehicle for Tank Test-Hardware and Software (자율 무인 잠수정(AUV)의 모의 실험을 위한 테스트베드의 개발-하드웨어와 소프트웨어)

  • 이판묵;전봉환;정성욱
    • Journal of Ocean Engineering and Technology
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    • v.11 no.1
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    • pp.106-112
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    • 1997
  • This paper describes the development of a test-bed vehicle named TAUV which can be a tool to evaluate the performance of a new control algorithm, operating software and the characteristics of sensors for an AUV. The test-bed AUV is designed to operate at depth of ten meters. It is 19.5kg in air and neural buoyancy in water and the dimension is $535{\times}400{\times}102mm$. TAUV is equipped with a magnetic compass, a biazial inclinometer, a rate gyro, a pressure sensor and an altitude sonae for measuring the motion of the vehicle. Two horizoltal thursters and two elevators are installed in order to propel and control the AUV. This paper persents the control system of TAUV which is based on a 16 bit single-chip microprocessor, 80c196kc, and the software architecture for the operating system. Experimental results are included to verify the performance of the TAUV.

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A Study for the Fatigue Crack Growth Behavior of Concrete (콘크리트의 피로균열 성장거동에 관한 연구)

  • 김진근;김윤용
    • Proceedings of the Korea Concrete Institute Conference
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    • 1996.10a
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    • pp.101-107
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    • 1996
  • In this study, the wedge splitting test (WST) specimens with various strength levels were tested to investigate the fatigue crack growth behavior of concrete. Selected test variables were concrete compressive strength with 2 levels (28 MPa, 60 MPa, 100 MPa) and maximum fatigue loading with 2 levels (75%, 85%). Fatigue testing was preceded by fracture energy test and the crack growth was measured by means of the compliance calibration method, 60 WST specimens were cast for the fatigue test, and 6 companion cylinders ($\phi$100${\times}$ 200 mm) for each batch. In fatigue test, the frequency of loading cycle was 1 Hz, and the minimum fatigue loading level was 5~10 % of ultimate monotonic loading. On the basis of the experimental results, a fracture mechanics-based empirical relationships for fatigue crack growth rate (da/dN-$\Delta$KI relationships) were presented. In addition, the effect of initial notch depth on the fracture energy and the validity of compliance calibration technique for the WST were shown.

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