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RISS 인기검색어
- 검색키워드
- 저자 : Jungao Zhu (검색결과 3 건)
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Analytical solution and experimental study of membrane penetration in triaxial test
Ji, Enyue,Zhu, Jungao,Chen, Shengshui,Jin, Wei Techno-Press 2017 Geomechanics & engineering Vol.13 No.6
Membrane penetration is the most important factor influencing the measurement of volume change for triaxial consolidated-drained shear test for coarse-grained soil. The effective pressure p, average particle size $d_{50}$, thickness $t_m$ and elastic modulus $E_m$ of membrane, contact area between membrane and soil $A_m$ as well as the initial void ratio e are the major factors influencing membrane penetration. According to the membrane deformation model given by Kramer and Sivaneswaran, an analytical solution of the membrane penetration considering the initial void ratio is deduced using the energy conservation law. The basic equations from theory of plates and shells and the elastic mechanics are employed during the derivation. To verify the presented solution, isotropic consolidation tests of a coarse-grained soil are performed by using the method of embedding different diameter of iron rods in the triaxial samples, and volume changes due to membrane penetration are obtained. The predictions from presented solution and previous analytical solutions are compared with the test results. It is found that the prediction from presented analytical solution agrees well with the test results.
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Effect of Gradation on the Compactability of Coarse-Grained Soils
Erlu Wu,Jungao Zhu,Wanli Guo,Zongliang Zhang 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.2
The optimal gradation for coarse-grained soil used in earth-rockfill dams is an essential designindex when determining the compactability of coarse-grained soil. With the optimalgradation, coarse-grained soil can be rolled to the maximum of dry densities among allgradations under the same compaction effort. Accordingly, this research introduced agradation equation with the gradation parameters b and m and the maximum particle sizedmax to establish a quantitative description of the gradation curve. From the results of themaximum dry density tests, the maximum dry density ρmax is found to show a parabolic curverelationship with a parameter called gradation area S, which is defined as the area surroundedby the gradation curve. If the maximum particle size is a constant, the optimal gradation area, S0,has the same value for coarse-grained soils with different shapes or different parent rocks,whereas S0 linearly decreases with the increase in ln dmax. Furthermore, if dmax is known, theoptimal gradation area S0 can be evaluated by the proposed linear equation. Findings support afeasible method for designing the optimal gradation distribution in laboratory tests and in-situ.
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Experimental Study on Influence Factors and Empirical Formula of K0 for Coarse Grained Soil
Mingjie Jiang,Jungao Zhu,Shengshui Chen,Xiaodong Wang,Wanli Guo 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.8
The earth pressure coefficient at rest K0 is a key mechanical parameter of soil, so studying K0 of coarse grained soil has important theoretical value and practical significance in geotechnical engineering works. To investigate the influence factors of K0 for coarse grained soil, a series of K0 compression tests for a sandy gravel and a rockfill were conducted by utilizing a newly-developed largescale K0 device. The test data show that there is a negative linear correlation between K0 and initial relative density Dr0. The data also show that the increasing vertical effective stress will decrease the K0 value, and the effect of low on the K0 is more obvious. Large-scale consolidated drained (CD) triaxial tests for soils used for K0 compression test were carried out, and according to the data of CD triaxial tests and K0 compression tests the correlation between K0 and effective internal friction angle φ′ is established. Based on the result, an empirical equation is presented. This equation can be used to predict the K0 value of the coarse grained soil under a random consolidation condition and stress condition according to the value of φ′. Furthermore, this empirical formula is verified by K0 compression tested data.
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