[논문]반복하중 재하 시 모래-타이어칩 혼합토의 최대전단탄성계수 변화

류병욱; 박정희; 추현욱

doi:10.14481/jkges.2021.22.12.41

반복하중 재하 시 모래-타이어칩 혼합토의 최대전단탄성계수 변화
Maximum Shear Modulus of Sand - Tire Chip Mixtures under Repetitive KO Loading Conditions 원문보기

한국지반환경공학회논문집 = Journal of the Korean Geoenvironmental Society, v.22 no.12, 2021년, pp.41 - 50

류병욱 (Dept. of Civil Engineering, Kyung Hee Univ.) , 박정희 (School of Civil, Environmental and Architectural Engineering, Korea Univ.) , 추현욱 (Dept. of Civil and Environmental Engineering, Hanyang Univ.)

초록
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본 연구의 목적은 모래와 타이어칩 혼합토의 반복하중조건 전후 공학적 특성 변화를 파악하는 것이다. 반복하중 시, 시료에 함유된 타이어칩 함량 및 모래와 타이어칩 입자 간의 크기비에 따른 최대전단탄성계수의 변화를 정량화 하고자, 전체 중량 대비 타이어칩 중량을 0, 10, 20, 40, 60, 100%로 하여 시료를 조성하였으며, 타이어칩 평균입경 대비 모래의 평균입경(입자크기비)을 0.44, 1.27, 1.87, 4.00으로 설정하여 혼합토를 조성하였다. 초기 상대밀도 50%의 시료를 floating wall 형태의 몰드에 조성 후, 공기압 축기(air compressor), 압력 패널(pressure panel) 및 뉴메틱 밸브(pneumatic valve)를 이용하여 정하중 재하(=50kPa), 반복하중 재하(=50-150kPa), 정하중 재하(=400kPa) 및 제하 순으로 실험이 이루어 졌다. 위의 실험이 진행됨에 따라 시료의 침하량과 전단파속도를 측정하였다. 시험 결과, 모래-타이어칩 혼합토에 가해지는 반복하중은 시료를 이루는 입자 간 접촉을 타이어칩-타이어칩 또는 타이어칩-모래에서 모래-타이어칩 또는 모래-모래로 전환시켰으며, 이로 인해 타이어칩 함량 40%에서 가장 큰 최대전단탄성계수의 증가를 확인하였다. 또한 입자크기비가 감소함에 따라 동일 타이어칩 함량에서 반복하중 시 최대전단탄성계수 증가량은 증가하였다.

Abstract ▼ AI-Helper

This study investigated the changes in engineering characteristics of sand-tire chip mixtures during repetitive loading. To quantify the changes in the maximum shear modulus according to the tire chip content in the mixtures and the particle size ratio between sand particle and tire chip, the samples were prepared with tire chip content of TC = 0, 10, 20, 40, 60, and 100%, and the particle size ratios SR were also set to be SR = 0.44, 1.27, 1.87, and 4.00. The stress of the prepared sample was applied through a pneumatic cylinder. The experiment was conducted in the order of static loading (= 50 kPa), cyclic loading (= 50-150 kPa), static loading (= 400 kPa) and unloading. The stress applied to tested mixtures was controlled by a pressure panel and a pneumatic valve by using an air compressor. The shear wave velocity was measured during static and cyclic loadings by installing bender elements at the upper and lower caps of the mold. The results demonstrated that the change in maximum shear modulus of all tested materials with varying SR during repetitive loading is the most significant when TC ~ 40%. In addition, the mixture with smaller SR at a given TC shows greater increase in maximum shear modulus during repetitive loading.

주제어

표/그림 (11)

그림 Fig. 1. (a) Particle distribution curve; and (b) variation of unit weight according to tire chip content
그림 Fig. 2. Schematic drawing of test setup
표 Table 1. Physical properties of unmixed materials
그림 Fig. 3. Stress-strain curves of tested materials: (a) K4-tirechip mixture with varying tire chip content (TC); (b) tested mixtures with size ratio (SR) = 0.44, 1.27, and 4.00 at TC = 20%; and (c) mixtures at TC = 40%
그림 Fig. 4. Variation of vertical (or volumetric) strain according to cyclic loading number and tire chip content: (a) mixtures with size ratio = 1.27; and (b) mixtures with size ratio = 4.00
그림 Fig. 5. Variation of Shear wave velocity according to vertical effective stress curves: (a) effect of different tire chip contents; and (b) effect of different size ratios
그림 Fig. 6. Variation of shear wave velocity of SR = 4 mixtures with varying tire chip contents according to cyclic loading number
그림 Fig. 7. Variation of compression index according to tire chip content: (a) compression index before cyclic loading; and (b) compression index after cyclic loading
그림 Fig. 8. Variation of norm. ∆Gmax of tested materials with varying SR according to tire chip content
그림 Fig. 9. Variation of maximum shear modulus of mixture with SR = 0.44 according to cyclic loading number
그림 Fig. 10. Relationship between V_s model parameters: (a) mixture with SR = 0.44; and (b) mixture with SR = 4.00

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