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Chen Z.-H.,Reconnaissance and Design Institute | Li L.-L.,Zhejiang University | Wang L.-Z.,Zhejiang University | Xu Y.,Reconnaissance and Design Institute | Yang Y.,Reconnaissance and Design Institute
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

There is divergence of opinions on the effect of geosynthetic reinforcement and the selection of suitable geosynthetic materials; it is a constraint for its appropriate application. This paper investigates the mechanical behavior and the contribution of reinforced materials with an reclamation engineering example in Pinghu, Zhejiang province. Besides, in-situ test is made using improved displacement gauge. Based on the numerical analysis and in-situ test, further discussion is made on the type and the corresponding design parameters of reinforced materials. And some valuable conclusions are drawn as follows; the uniaxial-tensile geogrid should be put into the first place for the treatment of sea dike; the upper and lower bounds of the limit elongation should be prescribed, and so on.

Zheng Y.,Reconnaissance and Design Institute | Chen Z.-H.,Reconnaissance and Design Institute | Zhang K.-W.,Reconnaissance and Design Institute | Zhang J.-W.,Reconnaissance and Design Institute | Shen Y.-J.,Reconnaissance and Design Institute
Yantu Lixue/Rock and Soil Mechanics | Year: 2014

In order to solve the inclined problem of the ancient seawall, the earth pressure on the ancient seawall with different types of backfills are observed based on the in-situ test. Three types of ancient seawall are filled with different backfills as the foamed cement banking (FCB), natural soil and shale ceramisite respectively. The law that the earth pressure changed with time is analyzed, also including the distribution of the earth pressure and the location of resultant force point. The unloading effects of the three different filled materials are discussed. The distribution of earth pressure is nonlinearly folded at different levels in the middle of the wall. The earth pressure is higher in the middle and lower at the both top and bottom of ancient seawall. The height of actual action point of earth pressure resultant from field measuring is 0.42-0.49 times of the wall height which is upper than the theoretic calculating result. FCB is an effective unloading filled material used to decrease the pressure on the ancient seawall that it can reduce the earth pressure and overturning moment by 33.1% and 41.4% respectively comparing with undisturbed soil.

Jiang H.-Y.,Zhejiang University | Chen Z.-H.,Reconnaissance and Design Institute | Guo Z.,Zhejiang University | Wang L.-Z.,Zhejiang University
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

The ancient Qiantang River seawall, built in Ming and Qing dynasties, is an important barrier in defending the estuary area of Qiantang River against floods and tides. To prevent strong hydrodynamic loads scouring the foundation and lowering the stability of the seawall, the apron structure is built at the front of the ancient seawall. The apron in the Haining region is mostly built by laying unbonded strip stones. To investigate the failure mechanism of such apron, wave and flow flume model tests are performed. It is shown that such apron is vulnerable to the impact by strong tidal bores where the covering stones are missing. The soil under the apron is vulnerable to the erosion by ebb tide seepage and longitudinal current, which leads to the sinking of the apron. As a cover layer, the apron has a good performance in protecting the soil, and can prevent the soil from instantaneous and residual liquefaction.

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