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RISS 인기검색어
- 검색키워드
- 저자 : Shengshui Chen (검색결과 3 건)
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Centrifugal Model Test on the Failure Mechanism of Barrier Dam Overtopping
Tianlong Zhao,Shengshui Chen,Changjing Fu,Qiming Zhong 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.4
In order to study the failure mechanism of barrier dam overtopping, centrifugal model tests of dam failure were conducted in this research. A calculation method of rectangular weir flow in the centrifugal field was derived. The process and mechanism of barrier dam overtopping were intensively analyzed. They were further verified by the breach flow curve and the development curve of the breach top width acquired from model tests. Results showed that the barrier dam breach developed during the entire process of overtopping in the width direction. The development of the barrier dam breach in the depth direction, however, ceased at an earlier time on account of the large particles accumulated in the downstream slope. Moreover, coarsening in the downstream slope could be clearly observed in the last stage of overtopping. Thus, it was concluded that the bottom part of the barrier dam could survive after dam breaching and that a full dam failure is relatively rare for a barrier dam. Furthermore, the size of the remaining breach would be less than that of a homogeneous earth dam under the same conditions.
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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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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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