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Featured researches published by Zhang Dingwen.


Marine Georesources & Geotechnology | 2013

Experimental Investigation of Unconfined Compression Strength and Stiffness of Cement Treated Salt-Rich Clay

Zhang Dingwen; Fan Libin; Liu Songyu; Deng Yongfeng

Soft clay with high sodium chloride salt concentration is a problem encountered by geotechnical and highway engineers. Chemical stabilization using cement is an attractive method to improve the engineering properties of soft soil. However, very limited studies have been conducted to reveal the effect of salt concentration on the engineering properties of cement-stabilized soil and the reported results in literature are not consistent. The impact of sodium chloride salt on the strength and stiffness properties of cement-stabilized Lianyungang marine clay is studied in this study. The clay with various sodium chloride salt concentrations was prepared artificially and stabilized by various contents of Ordinary Portland cement. A series of unconfined compressive strength (UCS) tests of cement stabilized clay specimen after 7, 14, and 28 days curing periods were carried out. The results indicate that a high sodium chloride salt concentration has a detrimental effect on the UCS and stiffness of cement-stabilized clay. The detrimental effect of salt concentration on the strength and stiffness of cement-stabilized clay directly relates to cement content. Soils mixed with high cement content are more resistant to the negative effect of salts than soils mixed with low cement content. The ratio of modulus of elasticity to UCS of cement treated soil does not have an obvious relationship with salt concentration. The findings of this study present a rational basis for the understanding of the impact of salt on the engineering properties of cement-treated soil.


Marine Georesources & Geotechnology | 2013

A Combined Dry Jet Mixing-Prefabricated Vertical Drain Method for Soft Ground Improvement: A Case Study

Zhang Dingwen; Liu Songyu; Han Wenjun; Du Guangyin

A remarkable combined dry jet mixing (DJM) and prefabricated vertical drains (PVDs) method was used to enhance the performance for soft ground improvement. In the combined method, PVDs are first installed and then DJM columns are installed between the PVDs at larger spacing. This combined method improves the effectiveness of the ground improvement and creates a more economical solution. This paper presents a case study of the combined method for marine clay improvement in Lianyugang of China. The excess pore water pressure in soils created by the installation of DJM columns with and without PVDs was monitored and compared. In situ standard penetration tests were conducted in the DJM columns and before-and-after piezocone penetration tests were performed in soils surrounding the columns. Long-term settlement monitoring under embankment loading was carried out for the ground improved by combined method and DJM method alone. The field tests, settlement monitoring and economic benefit analysis results demonstrated that the DJM-PVD method is technologically sound and cost-effective as compared with the conventional DJM method.


Archive | 2005

Operation method for consolidating soft soil foundation by pneumatic flerry vacuum preloading method

Liu Songyu; Hong Zhen-shun; Zhang Dingwen


Archive | 2014

Indoor model testing device and testing method employing air-pressure splitting vacuum preloading method

Liu Songyu; Han Wenjun; Zhang Dingwen


Archive | 2014

Processing system and carbonization pile-forming method used for ground stabilization

Liu Songyu; Cai Guanghua; Yi Yaolin; Yang Yong; Zhang Dingwen


Archive | 2014

Liquefiable foundation device for micro-nano bubble processing and operation method

Zhang Dingwen; Peng Erxing; Sun Wenbo; Liu Songyu


Archive | 2006

Plastic air-guiding discharging board

Liu Songyu; Zhang Dingwen


Archive | 2017

Microbial slurry for reducing saturability of liquefiable sandy soil foundation and preparation and use methods thereof

Peng Erxing; Zhang Dingwen; Hu Xiaoying; Lin Hanyu


Procedia Engineering | 2016

A New Combined Vacuum Preloading with Pneumatic Fracturing Method for Soft Ground Improvement

Liu Songyu; Zhang Dingwen; Du Guangyin; Han Wenjun


Archive | 2016

Method for treating liquefiable sandy soil foundations by aid of microbial bubble

Zhang Dingwen; Bang Erxing; Liu Songyu

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