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Liu F.,Beijing Municipal Engineering Research Institute | Li D.-H.,Beijing Municipal Engineering Research Institute | Li D.-H.,Beijing Jiaotong University | Wu L.-S.,Shandong Design Institute of Water Resources
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013

The total pile resistance is compared with the end resistance, and the influence of shaft resistance on particle size effects in pile centrifuge tests is studied. For the same prototype, because the mobilization of the shaft resistance is different, the values of the shaft resistance obtained from the tests with different model piles are not the same. On the other side, the particle size effects on the end resistance almost can be ignored except the slender ratio is 5. Because of the shaft resistance, the particle size effects on the total pile resistance are more marked than those on the end resistance under the same condition. Source


Zhang Y.,Hohai University | Xu W.,Hohai University | Shi C.,Hohai University | Zhang F.,Shandong Design Institute of Water Resources
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2011

Stress, strain and displacement in slope are calculated using the finite difference method. The finite arc method is presented based on the limit equilibrium theory and strength reduction method with deformation's change trend as a standard of failure. The presented method is applied to search critical slip surface and the minimum safety coefficient of slip, and the case studies with verification and parameters' discussion demonstrates the accuracy in the application of slope engineering. The presented method and the limit equilibrium method are applied to study critical slope of one large channel excavation in South-to-North Water Diversion Project. In the study three typical channel's slope modes including high slope, reclaimed slope and deep excavation slope mode are selected to get the safety coefficients' change with slope degrees of excavation, then the critical excavated slope of channel can be determined. The computed results show that high slope and reclaimed slope in the large channel require a high level for excavated slope degree. Compared to the excavation, the filling load owes more effect on the slope's stability. It's found that the presented methods in this paper more accurate and rational, which could complement the insufficiency of existing methods. The methods not only solve the design problems of large channel's slope, but also provide a good reference for the similar slope engineering. Source


Zhao C.S.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research | Sun C.L.,Shandong Design Institute of Water Resources | Xia J.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research | Hao X.P.,Wuhan University | And 3 more authors.
Water Resources Management | Year: 2010

A method is presented for impact evaluation of dams/sluices on their downstream aquatic ecosystems in the absence of detailed long-sequence ecology ecosystem data. It is based on the analysis of relations between indices of water quality and aquatic organisms. It can be applied to a river section absent of long-sequence ecology ecosystem data. For this study it was used to evaluate the effects of the Bengbu Sluice (BS), a typical sluice in the Huai River in China. Results indicate that in April and May the impact of BS on different downstream aquatic organisms varied. The most significant impact was on phytoplankton, with 91.7% of phytoplankton indices showing a 100% increase in quantity and biomass. The second most significant was on zooplankton, with 60.0% of zooplankton showing greater increase in quantity and biomass. The least significant impact was on zoobenthos, with only 33.3% showing greater increase in quantity and biomass. Most of these organisms have higher pollution-resistibility. These findings suggest that the present operation scheme will gradually lead to biodiversity decrease in the downstream aquatic ecology system, which will harm the instream aquatic ecology. Overall, BS has a negative impact on the downstream aquatic ecology system. It is argued that, in order to reduce the negative impact on the downstream aquatic ecology system, the operation of BS needs to be improved so that the discharge into the downstream river course is increased. Data comparison of the aquatic ecosystem condition between 1982 and 2006 also demonstrates the decreasing aquatic ecosystem quality downstream of BS. © 2010 Springer Science+Business Media B.V. Source


Liu C.,CAS Institute of Geographical Sciences and Natural Resources Research | Zhao C.,CAS Institute of Geographical Sciences and Natural Resources Research | Xia J.,CAS Institute of Geographical Sciences and Natural Resources Research | Sun C.,Shandong Design Institute of Water Resources | And 2 more authors.
Journal of Hydrology | Year: 2011

Reliability of traditional methodologies is often challenged in determination of instream ecological flow (IEF) for a regulated river due to its non-natural condition. This paper deals with an IEF determination method for regulated rivers called the Adapted Ecological Hydraulic Radius Approach (AEHRA). It considers information of both instream ecosystem and river course, while it does not require any flow regime. Beside monthly IEF, it outputs monthly Instream Ecological Water-level (IEW) as well. The latter can greatly facilitate dam operation. Application of this method to the Huai River which is completely regulated by dams suggest: (1) AEHRA is especially predictive for rivers with limited ecological and hydrological data; (2) it can reflect the seasonal variation of IEF and IEW; (3) errors of AEHRA introduced by using a geometric shape generalized cross-section in an un-gauged site are generally acceptable; (4) comparison of the IEF values estimated by AEHRA with those by Tennant approach, Wetted Perimeter method and R2CROSS method showed fairly good agreement in terms of practical capability of the AEHRA. This method will be of great help for regionally sustainable water management in data-scarce regulated rivers. © 2010 Elsevier B.V. Source


Liu F.,Beijing Municipal Engineering Research Institute | He M.,Beijing Municipal Engineering Research Institute | Yu L.,Beijing Urban Rapid Transit Company | Liu Y.,Beijing Municipal Engineering Research Institute | And 2 more authors.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015

The separation of monolithic roadbed from tunnel is a very common default for roadbed. The purpose of the paper is to measure the separation without damaging the monolithic roadbed. For this reason, the settlement of the roadbed is measured when the train stays in the station and passes through the monitoring points by the hydrostatic leveling sensor and the difference is calculated. On the other hand, the separation of monolithic roadbed from tunnel is also measured by drilling cores on the roadbed. The results show that the more the separation of monolithic roadbed from tunnel, the more the deformation of the roadbed when the train passing through the monitoring points. And the settlement measured by the hydrostatic leveling sensor is volatile. The deformation of roadbed decreases with the decreasing of the separation and the settlement displayed by the hydrostatic leveling sensor are static. According to the rule, the formula is induced to calculate the separation of monolithic roadbed from tunnel by hydrostatic leveling sensor. And comparing with the results of drilling cores, although the calculated results are less than the measured one, the change law holds unanimity and the range of separation is almost the same. Therefore, the method measuring the separation of monolithic roadbed from tunnel by hydrostatic leveling sensor is valid. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved. Source

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