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Effect of Sample Disturbance on Unconfined Compression Strength of Natural Marine Clays

海洋工程：英文版 2003年第3期17卷 407-416页

作者：刘汉龙洪振舜 eotechnical institute institute of Geotechnical Engineering

Quantitatively correcting the unconfined compressive strength for sample disturbance is an important research project in the practice of ocean engineering and geotechnical engineering. In this study, the specimens of undisturbed natural marine clay obtained from the same depth at the same site were deliberately disturbed to different levels. Then, the specimens with different extents of sample disturbance were trimmed for both oedometer tests and unconfined compression tests. The degree of sample disturbance SD is obtained from the oedometer test data. The relationship between the unconfined compressive strength q u and SD is studied for investigating the effect of sample disturbance on q u. It is found that the value of q u decreases linearly with the increase in SD. Then, a simple method of correcting q u for sample disturbance is proposed. Its validity is also verified through analysis of the existing published data.

关键词： correcting method degree of sample disturbance liquid limit natural marine clays natural water content oedometer test data unconfined compressive strength

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Effect of drying environment on engineering properties of an expansive soil and its microstructure

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Journal of Mountain Science 2017年第6期14卷 1194-1201页

作者： KONG Ling-wei WANG Min GUO Ai-guo WANG Yong State Key Laboratory of G-eomechanics and G-eotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China Rockfield Software Limited Swansea Wales SA1 8AS UK

This paper investigates the effect of drying environment, i.e. temperature and relative humidity, on the engineering properties and microscopic pore size distribution of an expansive soil. The shrinkage tests under different drying temperatures and relative humidity are carried out in a constant climate chamber. Then, the undisturbed samples, prepared in different drying environment, are used for the triaxial tests and mercury intrusion tests. It is found that the drying environment has noticeable influence on the engineering properties of expansive soils and it can be characterized by the drying rate. The linear shrinkage and strength increase with the decrease of the drying rate. The non-uniform deformation tends to happen in the high drying rate, which subsequently furthers the development of cracks. In addition, during the drying process, the variation of pores mainly focuses on the inter-aggregate pores and inter-particle pores. The lower drying rate leads to larger variation of pore size distribution.

关键词： Expansive soils Drying environment Shrinkage Strength Pore size distribution Triaxial test

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Failure mechanism and stability analysis of the Zhenggang landslide in Yunnan Province of China using 3D particle flow code simulation

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Journal of Mountain Science 2016年第5期13卷 891-905页

作者： SHI Chong LI De-jie CHEN Kal-hua ZHOU Jia-wen Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210098China institute ofC eotechnical ResearchHohai UniversityNanjing 210098China State Key Laboratory of Hydraulics and Mountain River Engineering $iehuan UniversityChengdu 610065China

Based on the principle of 3D particle flow code,a numerical landslide run-out model is presented to simulate the failure process of the Zhenggang landslide(in southwestern China) under the effect of water after a *** relationship between the micro-mechanical parameters and the macro-shear strength of the grain material is determined through numerical *** the rainfall effect is considered in numerical simulations and rain-induced sliding processes are performed,which help us to discuss the mechanism of deformation and failure of this landslide together with field *** shows the Zhenggang landslide would most likely be activated in Zone I and would gain momentum in Zone *** order to prevent the potential disaster,a tailing dam is advised to be designed about 175 m downstream from the current landslide boundary of Zone *** by field observations,the presented landslide model can reflect the failure mechanism after *** can also provide a method to predict the potential disaster and draft disaster prevention measures.

关键词： Back analysis Deposit avalanche Dynamic process Landslide Particle flow code

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