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성화돈 ( Sung Hwa-don ),황의성 ( Hwang Yi-sung ),천병식 ( Chun Byung-sik ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.1
Portland cement and sodium silicate are widely used as the main components of the injection, which are used to prevent flow and improve ground condition. The main problem of the injection material is the leaching of the sodium hydroxite and silicate due to the limited reaction with the cement. In this paper, the effect of cement dydration retarder on the compressive strength of the sodium silicate - cement gel was studied. A series of tests, including digital-type testing machine, X-ray diffraction and scanning electron microscope were performed. Results were clearly demonstrated that the sodium tripolyphosphate(STPP), which was the cement hydration retarder in the test, significantly improved the initial strength of the homogel.
NATM 터널의 대심도 풍화대층에서의 지반거동 및 보강방법
성화돈(Hwa-Don Sung),안정환(Jung-Whan An),천병식(Byung-Sik Chun) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
This study analyzed ground settlement and ground stress depending on tunnel excavation and the ground reinforcing grouting methods for double line road tunnel through deep weathered zone. Diameter of double line road tunnel was approximately 12m and umbrella arch method and side wall reinforcing grouting were applied. The ring-cut split excavation method and CD-cut excavation method for excavation method were applied. Analysis of failure rate and vertical stress ratio show that the tunnel for which the height of the cover(H) was higher than four times the diameter, it can be considered a deep tunnel. Comparisons of various excavation and ground reinforcement methods were showed that CD-cut method results in lower surface and crown settlement, and lower failure rate than where using Ring-cut split method. In addition the side wall reinforcing grouting resulted in reduction of tunnel displacement and settlement.
성화돈(Sung Hwa-Don),황의성(Hwang Yi-Sung),천병식(Chun Byung-Sik) 한국구조물진단유지관리학회 2007 한국구조물진단학회 학술발표회논문집 Vol.11 No.1
Portland cement and sodium silicate are widely used as the main components of the injection, which are used to prevent flow and improve ground condition. The main problem of the injection material is the leaching of the sodium hydroxite and silicate due to the limited reaction with the cement. In this paper, the effect of cement dydration retarder on the compressive strength of the sodium silicate-cement gel was studied. A series of tests, including digital-type testing machine, X-ray diffraction and scanning electron microscope were performed. Results were clearly demonstrated that the sodium tripolyphosphate(STPP), which was the cement hydration retarder in the test, significantly improved the initial strength of the homogel.
Compaction Grouting System에 의한 철도역사건물 파일기초보강효과
천병식(Chun Byung Sik),최승권(Choi Seung Kwon),도종남(Do Jong Nam),성화돈(Sung Hwa Don) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
By the countermeasure which is caused by with railroad station ground settlement it applied a CGS in each independent foundation. The effectiveness of the ground improvement and the bearing capacity of the compaction pile has been verified by the Cone Penetration Test(CPT) and Load Test. Test result show that penetration resistance and the cone friction force increased a lot and settlement 13.475㎜ as the standard settlement 40.0㎜ appeared at below. Also uniaxial compression test result 278㎏/㎠ as the standard 150㎏/㎠ appeared far a lot.