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RISS 인기검색어
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- 저자 : Huayang Lei (검색결과 4 건)
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Compression Characteristics of Ultra-soft Clays Subjected to Simulated Staged Preloading
Huayang Lei,Xuechao Wang,Li Chen,Maosong Huang,Jie Han 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.2
Ultra-soft soils have high water content, low strength, and high compressibility. Staged preloading has been commonly used in China to improve ultra-soft soils during land reclamation before highways and other structures are constructed. In this study, seven series of one-dimensional consolidation tests were performed on undisturbed, remolded, or reconstituted specimens of three types of soils subjected to simulated, staged loading. Test results showed that the compression curves had two straight lines, which intersected at a yield stress. Burland’s concept of the intrinsic compression line was adopted to present the compression curves of reconstituted clays at different initial water contents. The intrinsic compression line was modified to better fit the test data for the stresses lower than 40 kPa. The coefficient of soil consolidation increased with an increase of the effective vertical stress as a result of the rate of increase in constrained modulus higher than that of decrease in permeability. The maximum coefficient of secondary consolidation, Cámax, was correlated with the ratio of the initial void ratio to the void ratio at yield stress by a unique curve, which was proposed to distinguish the pre-yield stress from the post-yield stress state. Test results showed that the secondary compression characteristics depended on the applied stress and the initial void ratio.
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Geotechnical characteristics and consolidation properties of Tianjin marine clay
Lei, Huayang,Feng, Shuangxi,Jiang, Yan Techno-Press 2018 Geomechanics & engineering Vol.16 No.2
Tianjin, which is located on the west shore of the Bohai Sea, is part of China's Circum-Bohai-Sea Region, where very weak clay is deposited. From the 1970s to the early $21^{st}$ century, Tianjin marine clay deposits have been the subject of numerous geotechnical investigations. Because of these deposits' geological complexity, great depositional thickness, high water content, large void ratio, excessive settlement, and low shear strength, the geotechnical properties of Tianjin marine clay need to be summarized and evaluated based on various in situ and laboratory tests so that Tianjin can safely and economically sustain more infrastructure in the coming decades. In this study, the properties of Tianjin marine clay, especially its consolidation properties, are summarized, evaluated and discussed. The focus is on establishing correlations between the geotechnical property indexes and mechanical parameters of Tianjin marine clay. These correlations include the correlations between the water content and the void ratio, the depth and the undrained shear strength, the liquid limit and the compression index, the tip resistance and the constrained modulus, the plasticity index and the ratio of undrained shear strength and the preconsolidation pressure. In addition, the primary consolidation properties of Tianjin marine clay, such as the intrinsic compression line (ICL), sedimentation compression line (SCL), compression index, $C_c$, coefficient of consolidation, $C_v$, and hydraulic conductivity change index, $C_{kv}$, are evaluated and discussed. A secondary consolidation property, i.e., the secondary compression index, $C_a$, is also investigated, and the results show that the ratio of $C_a/C_c$ for Tianjin marine clay can be used to calculate $C_a$ in secondary consolidation settlement predictions.
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Experimental study on the performance of compensation grouting in structured soil
Zheng, Gang,Zhang, Xiaoshuang,Diao, Yu,Lei, Huayang Techno-Press 2016 Geomechanics & engineering Vol.10 No.3
Most laboratory test research has focused on grouting efficiency in homogeneous reconstituted soft clay. However, the natural sedimentary soils generally behave differently from reconstituted soils due to the effect of soil structure. A series of laboratory grouting tests were conducted to research the effect of soil structure on the performance of compensation grouting. The effects of grouting volume, overlying load and grouting location on the performance of compensation grouting under different soil structures were also studied. Reconstituted soil was altered with added cement to simulate artificial structured soil. The results showed that the final grouting efficiency was positive and significantly increased with the increase of stress ratio within a certain range when grouting in normally consolidated structured clay. However, in the same low yield stress situation, the artificial structured soil had a lower final grouting efficiency than the overconsolidated reconstituted soil. The larger of normalized grouting volume could increase the final grouting efficiency for both reconstituted and artificial structured soils. Whereas, the effect of the overlying load on final grouting efficiencies was unfavourable, and was independent of the stress ratio. As for the layered soil specimens, grouting in the artificial structured soil layer was the most efficient. In addition, the peak grouting pressure was affected by the stress ratio and the overlying load, and it could be predicted with an empirical equation when the overlying load was less than the yield stress. The end time of primary consolidation and the proportion of secondary consolidation settlement varied with the different soil structures, grouting volumes, overlying loads and grouting locations.
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FEM and Experimental Analysis of Lunar Soil Excavation Test
Mingjing Jiang,Banglu Xi,Zhenyu Guo,Huayang Lei 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.8
A series of soil cutting tests was firstly carried out on the Earth on a ground composed of Tongji-1 lunar soil simulant (TJ-1 simulant) to experimentally investigate the effects of cutting depth, blade width, rake angle and blade arc angle on the excavation force. Then the tests were numerically simulated with the Finite Element Method (FEM), where a constant velocity was applied to the soil in contact with the blade, namely the soil cutting method or a rigid blade was generated and moved to cut the soil, namely the blade cutting method. The results show that the FEM simulation using the soil cutting method can provide excavation forces close to the experimental data when the rake angle is 0°, and well capture the effects of cutting depth, blade width and blade arc angle except the rake angle. The FEM simulation using the blade cutting method can capture the effect of rake angle while the predicted excavation forces are much larger than the experimental data. Nevertheless, both the methods cut the soil to a small displacement beyond which the analysis is unable to meet the convergence requirement.
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