• Title/Summary/Keyword: 진동주입공법

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절리에서의 주입재 유동특성에 관한 연구

  • 김문상;문현구
    • Proceedings of the Korean Society for Rock Mechanics Conference
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    • 1995.03a
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    • pp.48-55
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    • 1995
  • 주입공법은 지하공간을 개발할 때 굴착면의 붕괴와 지하수의 유입으로 인한 지하 공동의 불안정성을 방지하고 지반 침하를 최소화하여 지상 구조물에 미치는 피해를 줄이는 목적에 사용되고 있다. 또한 주입공법은 설비가 간단하고 소규모이기 때문에 협소한 장소나 공간에서도 시공할 수 있고 진동 및 소음에 대한 영향이 적기 때문에 공사현장에서 요긴하게 사용되는 공법이다. $^{(1)}$ (중략)

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Improvement Effects of Cement Grouting using Vibration Method through a Field Test (현장시험을 통한 시멘트 진동주입공법의 보강효과)

  • Han, Sanghyun;Yea, Geugweun;Kim, Hongyeon
    • Journal of the Korean GEO-environmental Society
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    • v.15 no.5
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    • pp.23-29
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    • 2014
  • So far, the grouting using pressure injection has been extensively used to avoid adverse effects such as soil disturbance. Whereas, the pressure injection to the limitations of the diffusion range, so that the kinks would last injection of cement particles by introducing a frequency oscillation effect improved injection method have been recently developed. In this study, a pilot test was performed to compare injection effects of the both methods. The injections using both methods were tested on the embankment which consists of core clay and weathered soil. Subsequently, the injected volume, SPT N values, in-situ permeability and electrical resistivity were measured to compare their effects. The vibration method showed more effective permeation comparing with the pressure method. Also, it showed more homogeneously improved ground than the existing method. For SPT results, the vibration method presented increase of mean N value as much as 17.4 % comparing with the conventional method. Higher electrical resistivity was presented in case of injecting with vibration method and it indicated the injection was extensively completed. Finally, it is expected that the economic feasibility will be improved by decrease of drilling spacing, when the existing method is replaced with vibration method.

Improvement of Grouting by Short-period Vibration Energy (단주기 진동에너지에 의한 그라우팅 보강효과)

  • Seo, Moonbok;Kwon, Sanghoon;Lee, Bongjik
    • Journal of the Korean GEO-environmental Society
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    • v.16 no.7
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    • pp.35-42
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    • 2015
  • Grouting method has been widely used for the ground improvement and stabilization: mostly to block or control the ground water in the early years and to improve the ground, repair the structure in recent years, ever increasing its use. Despite many advantages so far, the existing grouting method also has some shortcomings including uncertain permeation of grouting with gravity type if the voids between the soil particles are narrow, and problems due to the relaxation of the neighboring ground when injected using injection pressure. As an alternative, a vibration injection method with constant amplitude and frequency has been developed in recent years, with the vibration grouting being reported to have a permeability increasing effect of grout material compared with the positive pressure injection type. Accordingly, the purpose of this study is to investigate the improvement effect of the vibration grouting that applies short-period vibration energy by varying vibration cycle, vibration time and ground conditions to evaluate the strength enhancing effect of grouting materials, expansion effect of grouting body, ground improvement effect of the grouting and the penetration characteristics of the rock joint. The findings of this study show the improved compressive strength of grout, expansion of grouting body and increased penetration rate, according to the vibration compared with non-vibration under the loose soil condition.

Effect of Vibratory Injection on Grout Permeation Characteristics (진동주입이 그라우트재의 침투 특성에 미치는 영향 연구)

  • Lee, Mun-Seon;Kim, Jong-Sun;Lee, Sung-Dong;Choi, Young-Joon;Yang, Jae-Man;Lee, In-Mo
    • Journal of the Korean Geotechnical Society
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    • v.26 no.7
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    • pp.37-47
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    • 2010
  • To improve the grout penetration characteristics, a vibratory grout injection technique was adopted in this study. It is a technique of grout injection in which an oscillating pressure is added to the steady-state pressure as an injection pressure. By applying the vibration during grout injection, cement particles will become less adhesive and the clogging tendency will be decreased. A series of pilot-scale chamber tests were performed to verify the enhancement of the groutability by applying the vibratory grout injection; assessment on the change of the lumped parameter $\theta$ which represents a barometer of clogging phenomenon was made. Moreover, the effect of vibratory grout injection through the joint was also investigated using artificially made rock joints. Experimental results as well as analytical results show that the grout penetration depth can be substantially improved by vibratory grouting. Moreover, it was found that enhancement of the permeation grouting due to vibratory injection is more dominant at grouting pressure less than 400 kPa.

SIP시공말뚝의 지지력특성

  • 이명한;윤성진
    • Proceedings of the Korean Geotechical Society Conference
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    • 1993.04a
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    • pp.91-115
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    • 1993
  • 최근 환경문제에 대한 사회적 관심이 고조됨에 따라 말뚝항타로 인한 지반진동, 소음 등이 각종 건설현장에서 심각한 문제점으로 대두되고 있다. 지반을 굴착하고 cement paste를 주입한후 기성말뚝을 삽입하는 SIP공법은 이러한 건설환경 여건의 변화에 부응하여 그 적용이 급속히 증대되고 있다. 그러나 국내에서 SIP공법으로 시공딘 말뚝의 재하시험 결과는 각종 문헌에서 제시학 있는 지지력 산정공식들과는 상이한 특성을 나타내 주고있다. 또한 말뚝의 품질관리를 위한 시험결과는 상당한 지지력 미달현상이 발생학 있는 것으로 나타나고 있어 본 공법에 대한 지지력 특성이 규명되어야 할 필요가 있다. 본 논문에서는 국내에서 시공된 사례들을 중심으로 SIP공법의 지지력 특성을 분석하여 보았다.

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Grouting Properties using Thixotropic Material and Vibration Impact Method (가소성 그라우트 재료와 진동 및 충격을 부여하는 공법에 의한 지반개량 특성)

  • Keeseok Kim;Haseog Kim;Bong-hyun Baek;Simhun Yuk
    • Resources Recycling
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    • v.33 no.1
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    • pp.37-47
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    • 2024
  • In grouting, the LW method is commonly employed to induce the gelation of cementitious material using water glass, thereby restricting the extent of material injection. Nevertheless, challenges manifest when materials are lost before gelation, particularly in regions with high groundwater flow rates or significant subsurface voids. This study developed a thixotropic grout material using LFS and GGBFS to mitigate material loss during injection, with an assessment of its flow characteristics, durability in marine exposure, strength, and injection properties. The outcomes revealed that the thixotropic grout material exhibited flow ranging from 105 to 143 mm and enhanced strength and durability compared to the LW method. Furthermore, field tests substantiated that applying vibration and impact improved impermeability.

Experimental Study on Cement Cohesion Reduction Effect of Grout Mixer with Vibration Filter (진동필터가 설치된 그라우트 믹서의 시멘트 응집 저감 효과에 대한 실험적 연구)

  • Hwang, Sung-Pil;Jeoung, Jae-Hyeung;Kim, Chang-Yong;Lee, Woo-Je
    • The Journal of Engineering Geology
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    • v.28 no.1
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    • pp.61-67
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    • 2018
  • Grouting is reinforcement or cutoff method which uses the hardening agent which is typically represented by portland cement and injected into the ground or the structure. When mixing the cement in powder form with water, the particles tend to cohere each other. Once they cohered, the particle size tends to become larger while injection efficiency becomes lower. This study, in a bid to reduce the cohesion of cement, the screen was set inside the grout mixer so that the cement particles are separated while vibrating them. To validate the effect of vibration screen, comparison test was conducted by using ordinary portland cement, slag cement and micro cement. Viscosity test, bleeding test and grain-size analysis indicated that the characteristics varied significantly after passing through the vibration filter. It is expected that the vibration filter installed inside the grout mixer will reduce the cement cohesion when mixing with water.

Analysis on the behavior of shield TBM cable tunnel: The effect of the distance of backfill grout injection from the end of skin plate (뒷채움 주입 거리에 따른 전력구 쉴드 TBM 터널의 거동 특성 분석)

  • Cho, Won-Sub;Song, Ki-Il;Ryu, Hee-Hwan
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.16 no.2
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    • pp.213-224
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    • 2014
  • Recently, tunnelling with TBM is getting popular for the construction of cable tunnel in urban area. Mechanized tunnelling method using shield TBM has various advantages such as minimization of ground settlement and prevention of vibration induced by blasting that should be accompanied by conventional tunnelling. In Korea, earth pressure balance (EPB) type shield TBM has been mainly used. Despite the popularity of EPB shield TBM for cable tunnel construction, study on the mechanical behavior of cable tunnel driven by shield TBM is insufficient. Especially, the effect of backfill grout injection on the behavior of cable tunnel driven by shield TBM is investigated in this study. Tunnelling with shield TBM is simulated using 3D FEM. The distance of backfill grout injection from the end of shield skin varies. Sectional forces such as axial force, shear force and bending moment are monitored. Vertical displacement at the ground surface is measured. Futhermore, the relation between volume loss and the distance of backfill grout injection from the end of skin plate is derived. Based on the stability analysis with the results obtained from the numerical analysis, the most appropriate injection distance can be obtained.

Behavior of Rapidly Expansion Materials for Maintenance Railroad Bed Subjected to Cyclic Loading (반복하중을 받는 철도노반 보수용 급속 팽창재료의 거동)

  • Lee, Jundae;Shin, Eunchul
    • Journal of the Korean GEO-environmental Society
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    • v.10 no.2
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    • pp.45-50
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    • 2009
  • The differential settlement may be generated by the variation of stresses caused by the soft ground or ground water. The cracks are usually created when the structures are leaned or deformed due to the differential settlement. A grouting method has been mainly used till now to improve the bearing capacity of the ground when the foundation of the structure is deformed by differential settlements. However, when this method is used, it takes too long time to obtain the required strength and the period of the reinforcement effect is not long enough. The advantage of GPCON injection method is to have good mechanical properties and durability, and easy construction. In addition, the GPCON method rapidly fills up the void in soils by injecting some materials into underground and also obtain the increase of bearing and shearing forces due to the expansion. In this paper the restoration capability of the foundation settlement of railway and subway subjected to cyclic loading is analytically and experimentally evaluated using the high density rapidly expansion GPCON in order to investigate the types of deformations and vibrational characteristics.

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A Study on the Skin Friction Characteristics of SIP and Numerical Model of the Interface Between SIP and Soils (SIP말뚝의 주면마찰특성 및 주면 경계요소의 수치모델에 관한 연구)

  • 천병식;임해식
    • Journal of the Korean Geotechnical Society
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    • v.19 no.2
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    • pp.247-254
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    • 2003
  • While the interests in the environmental problem during the construction are increasing, the use of low noise-vibration auger-drilled pilling is increasing to solve noise and vibration problem in pilling. Therefore, in Korea, SIP (Soil-Cement Injected Precast Pile) method is mainly used as auger-drilled pilling. However, there is no proper design criteria compatible with the ground condition of Korea, so which is most wanted. To improve and supplement this situation, direct shear tests for the friction between SIP pile skin interface and soil were executed on various conditions. Through the analysis of test results, skin friction characteristics of SIP were investigated thoroughly Also, hyperbolic model parameter fomulas which describe the friction behavior and the new non-linear unit skin friction capacity model with SM, SC soil were suggested.