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Environmentally sustainable groundwater control during dewatering with barriers:A case study in Shanghai

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Underground Space 2021年第1期6卷 12-23页

作者： Zhi-Fei Xie Shui-Long Shen Arul Arulrajah suksun horpibulsuk Department of Civil Engineering School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Civil and Environmental Engineering Shantou UniversityShantouChina Key Laboratory of Intelligent Manufacturing Technology(Shantou University) Ministry of EducationShantouGuangdong 515063China Department of Civil and Construction Engineering Swinburne University of TechnologyVictoria 3122Australia School of Civil Engineering and Center of Excellence in Innovation for Sustainable Infrastructure DevelopmentSuranaree University of TechnologyNakhon Ratchasima 30000Thailand

This paper presents a case study on groundwater control and environmental protection during a deep excavation of the foundation pit for the Liyang Road Station of Metro Line 10 in Shanghai.A three-dimensional finite element simulation model was constructed to quantify the effects of a dewatering process on the environment around the excavation pit.To understand the decrease in the groundwater level around the foundation pit,the ground settlement and groundwater level were studied.During the excavation,environmental protection methods were used in the design of the optimal watering system to check its detrimental environmental effects.The effects of the diaphragm wall and horizontal barrier system were analyzed by varying their insertion depths and the resulting changes in the ground settlement and groundwater level were studied.It was found that increasing the insertion depth of the diaphragm wall reduced settlement near the excavation site but increased the construction costs.The diaphragm wall used in combination with a horizontal barrier was found to be effective in arresting the decrease in groundwater level and reducing settlement around the excavation site.

关键词： Dewatering Horizontal barrier Diaphragm wall Ground settlement Drawdown Confined water

Stability characteristics of shallow landslide triggered by rainfall

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Journal of Mountain Science 2019年第9期16卷 2171-2183页

作者： Avirut CHINKULKIJNIWAT Taworn TIRAMETATIPARAT Chanathip SUPOTAYAN Somjai YUBONCHIT suksun horpibulsuk Rattana SALEE Panich VOOTTIPRUEX School of Civil Engineering Center of Excellence in Civil Engineering Institute of Engineering Suranaree University of Technology Nakhon Ratchasima 30000 Thailand Department of Civil Engineering Rajamangala University of Technology Isan Nakhon Ratchasima 30000 Thailand Department of Teacher Training in Civil Engineering King Mongkut's University of Technology North Bangkok 10800 Thailand

Rainfall induced shallow landslides are known to be extremely dangerous since the sliding mass can propagate quickly and travel far from the source. Although the sliding mechanism in sloping ground is simple to understand, the problem may be complicated by unsaturated transient water flow. The flow behavior of rainwater in unsaturated sloping ground and the consequent factor of safety must be clearly understood to assess slope stability under rainfall conditions. A series of laboratory experiments was conducted to examine the critical hydrological states so that assessment of slope stability under rainfall condition can be performed. Based on the test results, a unique relationship between critical hydrological states, rainfall intensity, and soil properties was formulated. Sequential stability analysis provided insights into the stability of slopes subjected to variations in soil properties, slope angles and rainfall intensities, and the consequent variation in the depth of the failure plane, vital in landslide risk assessment, was determined through this analysis.The variation of rainfall intensity was found to strongly affect the depth of the failure plane in cohesionless sloping ground. Furthermore, the influence of rainfall intensity on the depth of the failure plane may be alleviated by a small magnitude of cohesive strength. The results of this study will reinforce knowledge of landslide behavior and help to improve mitigation measures in susceptible areas.

关键词： Shallow landslides Rainfall Failure depth

水泥稳定再生沥青路面/红土混合物用于软土改良的效果评估

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岩土力学 2022年第12期43卷 3305-3315页

作者： SUKSAN Aniroot horpibulsuk suksun 素拉那立皇家大学土木工程学院泰国阿叻府30000 素拉那立皇家大学土木工程学院可持续基础设施发展创新卓越中心泰国呵叻府30000 泰国皇家学会科学院泰国曼谷10300

评估了水泥稳定再生沥青路面(RAP)/边缘红土混合物作为碎石桩骨料替代传统采石场骨料的潜力,研究了混合材料在不同RAP置换率和有效约束压力下的不排水剪切强度变化。RAP置换率分别为10%、30%和50%(按干重计),普通硅酸盐水泥含量分别为1%... 详细信息

评估了水泥稳定再生沥青路面(RAP)/边缘红土混合物作为碎石桩骨料替代传统采石场骨料的潜力,研究了混合材料在不同RAP置换率和有效约束压力下的不排水剪切强度变化。RAP置换率分别为10%、30%和50%(按干重计),普通硅酸盐水泥含量分别为1%和3%。很明显,RAP的置换增加了大颗粒,同时减少了细小颗粒,因此增加了压实度。在低于先期固结压力的有效应力下,RAP-土颗粒混合物表现出与孔隙压力降低相关的应变硬化性能。当RAP置换率增加时,水泥稳定的RAP-土颗粒混合物应力-应变曲线的应变软化性能减弱。胶结作用提高了黏聚力,而内摩擦角未产生明显的变化。水泥稳定的RAP-土颗粒混合物的强度和刚度主要取决于胶结强度和RAP置换率。抗剪强度随着非稳定和水泥稳定的RAP-土颗粒混合物的RAP置换率增加而提高,而水泥稳定的RAP-土颗粒混合物的刚度由于沥青黏结剂的高能量吸收而下降。

关键词：水泥土地基处理再生沥青路面三轴不排水剪性状

Sliding mode control of three-phase AC/DC converters using exponential rate reaching law

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Journal of Systems Engineering and Electronics 2022年第1期33卷 210-221页

作者： JEERANANTASIN Narin NUNGAM suksun Department of Electrical and Computer Engineering Faculty of EngineeringKing Mongkut’s University of Technology North BangkokBangkok 10800Thailand

Sliding mode control(SMC) becomes a common tool in designing robust nonlinear control systems, due to its inherent characteristics such as insensitivity to system uncertainties and fast dynamic response.Two modes are involved in the SMC operation, namely reaching mode and sliding mode.In the reaching mode, the system state is forced to reach the sliding surface in a finite time.The major drawback of the SMC approach is the occurrence of chattering in the sliding mode, which is undesirable in most applications.Generally, the trade-off between chattering reduction and fast reaching time must be considered in the conventional SMC design.This paper proposes SMC design with a novel reaching law called the exponential rate reaching law(ERRL) to reduce chattering, and the control structure of the converter is designed based on the multiinput SMC that is applied to a three-phase AC/DC power converter.The simulation and experimental results show the effectiveness of the proposed technique.

关键词： exponential rate reaching law(ERRL) multi-input sliding mode control(SMC) chattering reduction three-phase AC-to-DC converter

Soil Parameter Identification for Wheel-terrain Interaction Dynamics and Traversability Prediction

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International Journal of Automation and computing 2006年第3期3卷 244-251页

作者： suksun Hutangkabodee Yahya Hashem Zweiri Lakmal Dasarath Seneviratne Kaspar Althoefer Department of Mechanical Engineering King's College London StrandLondon WC2R 2LSUK

This paper presents a novel technique for identifying soil parameters for a wheeled vehicle traversing unknown terrain. The identified soil parameters are required for predicting vehicle drawbar pull and wheel drive torque, which in turn can be used for traversability prediction, traction control, and performance optimization of a wheeled vehicle on unknown terrain. The proposed technique is based on the Newton Raphson method. An approximated form of a wheel-soil interaction model based on Composite Simpson＇s Rule is employed for this purpose. The key soil parameters to be identified are internal friction angle, shear deformation modulus, and lumped pressure-sinkage coefficient. The fourth parameter, cohesion, is not too relevant to vehicle drawbar pull, and is assigned an average value during the identification process. Identified parameters are compared with known values, and shown to be in agreement. The identification method is relatively fast and robust. The identified soil parameters can effectively be used to predict drawbar pull and wheel drive torque with good accuracy. The use of identified soil parameters to design a traversability criterion for wheeled vehicles traversing unknown terrain is presented.

关键词： Soil parameter traversability Newton Raphson Composite Simpson＇s Rule wheeled vehicle