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Modelling smear effect of vertical drains using a diameter reduction method

Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 279-290页

作者： Zhichao Shen siau chen chian Siew Ann Tan Chun Fai Leung School of Marine Science and Engineering South China University of TechnologyGuangzhouChina Department of Civil and Environmental Engineering National University of SingaporeSingapore

Vertical drains are used to accelerate consolidation of clays in ground improvement *** zones exist around these drains,where permeability is reduced due to soil disturbance caused by the installation *** solution is widely used in practice to consider the effects of drain discharge capacity and smear on the consolidation *** this study,a computationally efficient diameter reduction method(DRM)obtained from the Hansbo solution is proposed to consider the smear effect without the need to model the smear zone *** by analytical and numerical results,a diameter reduction factor is analytically derived to reduce the diameter of the drain,while achieving similar solutions of pore pressure dissipation profile as the classical full model of the smear zone and *** the DRM,the excess pore pressure u obtained from the reduced drain in the original un-disturbed soil zone is accurate enough for practical applications in numerical *** performance of DRM is independent of soil material *** also show equally accurate performance of DRM under conditions of multi-layered soils and coupled radial-vertical groundwater flow.

关键词： Consolidation Vertical drain Smear effect Pore pressure Soil improvement

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A Complementary Engineering-Based Building Damage Estimation for Earthquakes in Catastrophe Modeling

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International Journal of Disaster Risk Science 2016年第1期7卷 88-107页

作者： siau chen chian Department of Civil and Environmental Engineering National University of Singapore

Catastrophe modeling for earthquakes is conventionally designed as a probabilistic model to estimate the losses based on risk and vulnerability of a portfolio of exposures for a foreseeable set of events. This approach lacks a physical science of building damage that is linked to ground-shaking characteristics. A proposed engineeringbased building damage estimation model based on established theories of seismic wave propagation and structural resonance is presented to address some of these shortcomings. A damage factor is introduced to provide an indication of the relative extent of damage to *** based on the proposed methodology is carried out using data derived from four case studies: the 2011 Tohoku earthquake; the 2007 Bengkulu earthquake; the 2011 Christchurch earthquake; and the 1999 Chi-Chi *** show that the computed damage factors reasonably reflect the extent of actual damage to buildings that was observed in post-earthquake reconnaissance surveys. This indicates that the proposed damage simulation model has a promising future as a complementary assessment tool in building damage estimation in catastrophe modeling.

关键词：大楼损坏评价大祸建模回声地震工程小浪分析

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Pseudo-static/dynamic solutions of required reinforcement force for steep slopes using discretization-based kinematic analysis

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第2期11卷 289-299页

作者： Changbing Qin siau chen chian Department of Civil and Environmental Engineering National University of Singapore

This paper presents a procedure for assessing the reinforcement force of geosynthetics required for maintaining dynamic stability of a steep soil slope. Such a procedure is achieved with the use of the discretization technique and kinematic analysis of plasticity theory, i.e. discretization-based kinematic analysis. The discretization technique allows discretization of the analyzed slope into various components and generation of a kinematically admissible failure mechanism based on an associated flow ***, variations in soil properties including soil cohesion, internal friction angle and unit weight are accounted for with ease, while the conventional kinematic analysis fails to consider the changes in soil properties. The spatialetemporal effects of dynamic accelerations represented by primary and shear seismic waves are considered using the pseudo-dynamic approach. In the presence of geosynthetic reinforcement, tensile failure is discussed providing that the geosynthetics are installed with sufficient length. Equating the total rates of work done by external forces to the internal rates of work yields the upper bound solution of required reinforcement force, below which slopes fail. The reinforcement force is sought by optimizing the objective function with regard to independent variables, and presented in a normalized form. Pseudo-static analysis is a special case and hence readily transformed from pseudodynamic analysis. Comparisons of the pseudo-static/dynamic solutions calculated in this study are highlighted. Although the pseudo-static approach yields a conservative solution, its ability to give a reasonable result is substantiated for steep slopes. In order to provide a more meaningful solution to a stability analysis, the pseudo-dynamic approach is recommended due to considerations of spatial etemporal effect of earthquake input.

关键词： Geosynthetics Pseudo-static/dynamic approach Discretization technique Discretization-based kinematic analysis Reinforced soil Seismic stability

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基于多切线技术的盾构隧道开挖面稳定性分析

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岩土工程学报 2024年

作者：钟军豪 chian siau chen 李永鑫刘明芳陈明辉吴振元龙桂华杨小礼周德中南大学土木工程学院新加坡国立大学土木与环境工程系合肥工业大学汽车与交通工程学院深圳市市政工程总公司

针对非线性条件下深埋隧道开挖面稳定性问题，采用多切线技术分段线性近似Power-Law(P-L)准则，基于极限分析上限定理，构建1种新的开挖面多曲线圆锥破坏机构，提出1种考虑拉应力截断Tensioncut-off(T-C)效应的开挖面稳定性理论计算方... 详细信息

针对非线性条件下深埋隧道开挖面稳定性问题，采用多切线技术分段线性近似Power-Law(P-L)准则，基于极限分析上限定理，构建1种新的开挖面多曲线圆锥破坏机构，提出1种考虑拉应力截断Tensioncut-off(T-C)效应的开挖面稳定性理论计算方法。通过与既有文献结果对比，验证所提方法的可靠性。根据反算的应力分布和破坏机构几何特点，探究不同参数条件下T-C对开挖面稳定性的影响。结果表明：(1)在线性条件下，黏聚力较大且内摩擦角较小时，T-C对开挖面临界支护力的影响较大；在非线性条件下，m的增加并不会放大T-C对开挖面稳定性的影响。(2)在抗拉强度较大时，T-C对开挖面稳定性影响较为显著，随着抗拉强度的折减，T-C控制的破坏机构尺寸逐渐减小，且顶部区域明显钝化。

关键词：开挖面稳定性多切线技术 Power-Law准则拉应力截断极限分析

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