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Ding Y.,East China Investigation and Design Institute | Zheng Z.,Large Dam Safety Supervision Center
Advances in Science and Technology of Water Resources | Year: 2013

In order to ensure the safety and reliability of CFRD's plinth placed on the bank slope of completely weathered bedrock, this paper analyses four key technical issues, including the bearing capacity of foundation, the seepage control of foundation, the stability of plinth, and the differential settlement of plinth. With the engineering example of Vietnamese Tuyen Quang CFRD, some appropriate engineering measures were proposed, which include improving the bearing capacity of foundation, strengthening the connection between plinth and completely weathered bedrock, ensuring the seepage stability of foundation and setting plinth expansion joints in different bedrock junctions. The dam safety monitoring results show that the seepage volume of Tuyen Quang CFRD is small, and the deformation regularity of the dam is normal. By application of the engineering measures proposed in this paper, placing the plinth on completely weathered bedrock is safe and feasible.

Zhang D.,Nanjing University | Cui H.,Nanjing University | Cui H.,Large Dam Safety Supervision Center | Shi B.,Nanjing University
Optics and Lasers in Engineering | Year: 2013

As a key parameter of distributed optical fiber sensing (DOFS), spatial resolution has a significant influence on the quality of measurement, which is verified by the constant tensile test and strain distribution comparison at different spatial resolution. Two common calibration methods for distributed optical fiber temperature measurement, including 10%-90% Step-Function and Hot-Spot method, as well as their applicability were discussed. A new calibration method, Dissimilar-Fiber-Splicing method, which means two free fibers with variant initial peak frequency were alternately spliced in series with different length, was recommended. And the experimental results by using Dissimilar-Fiber-Splicing method was shown. © 2012 Elsevier Ltd. All rights reserved.

Qiu L.,Hohai University | Zhang L.,Hohai University | Zhou R.,Hohai University | Shen Z.,Hohai University | Yang L.,Large Dam Safety Supervision Center
Energy Science and Applied Technology - Proceedings of the 2nd International Conference on Energy Science and Applied Technology, ESAT 2015 | Year: 2015

Shangmo Reservoir is located on the Jinjiahe River in the west of Tianshui in Gansu Province, China. It is a loam core, sandy gravel dam with a maximum height of 50.0 m. The in situ drilling and geological prospects show that the rock masses under the dam and reservoir area have a good permeability and the deep riverbed fault fracture zones are difficult to cut off completely by the impervious curtain. Thus, a seepage scheme namely “dam surface geomembrane reservoir bottom geomembrane bank concrete protection (gunite)” is applied for this project. Based on the establishment and calculation of the three-dimensional finite element seepage model, the analysis and comparison among three different horizontal seepage control measures was made. The results show that, in comparison with other schemes, the whole reservoir basin anti-seepage scheme have distinct advantages such as seepage-control effectiveness and operational stability. Besides, the seepage gradient of each structure is also within an allowable range. Therefore, the whole reservoir basin anti-seepage scheme is recommended for the Shangmo Reservoir Project. The achievement and experience of this horizontal seepage prevention design should be taken into consideration for other similar projects. © 2016 Taylor & Francis Group, London.

Shen Z.-Z.,Hohai University | Nie B.-S.,Hohai University | Xu L.-Q.,Hohai University | Yang L.,Large Dam Safety Supervision Center | Wang N.,Pan China Construction Group Co.
Applied Mechanics and Materials | Year: 2014

The stability of high rock slopes under the flood discharge atomization and rainfall is an in-negligible problem especially for the hydropower station with high head during the flood discharge. According to the complicated geological conditions of a high rock slope with the flood discharge problem in China, the method of the saturated-unsaturated unsteady seepage if used, thus the finite element model for the high rock slope in the downstream of the power station is set up. Based on the model, the distribution regularities of the unsteady seepage field of the rock slope is studied under the different discharge atomization and rainfall intensity. Moreover, based on the theory of continuous-discontinuous deformation, the finite element model is set up to analyze the stability of the slope, thus the deformation law of slopes under the flood discharge atomization and rainfall is studied and the safety of the slope is evaluated, and what's more, the engineering measures for improve the stability of the stability of the slope is put forward. © (2014) Trans Tech Publications, Switzerland.

Xu B.,Hohai University | Xu B.,China Institute of Water Resources and Hydropower Research | Liu B.,Large Dam Safety Supervision Center | Zheng D.,Hohai University | And 5 more authors.
Science China Technological Sciences | Year: 2012

Based on the internal temperature variation of a dam lagging behind the ambient temperature variation, the ambient temperature of continuous variation is disctetized, and the functional expression of the thermal displacement component of the dam caused by single instantaneous temperature variation is obtained. Considering the temporal and spatial distribution law of the ambient temperature and its relation with air and water temperature, the function is expanded into a Taylor series. As a result, the improved thermal displacement component expression for a dam monitoring model is obtained. © 2012 Science China Press and Springer-Verlag Berlin Heidelberg.

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