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Wang G.,PowerChina Chengdu Engineering Corporation Ltd | Li M.,Tianjin University | Zhou S.,Tianjin University
Advances in Science and Technology of Water Resources | Year: 2015

According to the geological characteristics of hydraulic and hydropower engineering, and based on the geologic datasets such as satellite images, topographic contour maps, drilling and adit data, geological description, georeferenced data, geophysical test data, test data among others, a spatial integrated approach of geological information combining multi-source data is proposed. Through the space interpretation and analysis of geological structures including terrain, rock formations and geotectonic bodies, a series of two-dimensional geologic sections, consistent with all data, were obtained by using a semi-automatic plotting method. Then, all these data were automatically layered and integrated analyzed. A practical example showed that coupling analysis and automatic integration of geological data with multiple sources, different accuracy and resolution ensure that all valid data become available and reliable information. ©, 2015, Editorial Office of Journal of Hohai University (Nature Sciences). All right reserved.

Chen Q.,PowerChina Chengdu Engineering Corporation Ltd | Chen Q.,HIGH-TECH
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2015

Complex geologic conditions like fault, extrusion zone, development of deep crack, heavy unloading of rock of Jinping I arch dam have contribute the foundation treatment to be the key part of the whole project. As regular cement grouting can not solve problems like strength of weak rock, deformation, penetration completely, so cement chemical compound grouting was studied systematically combining with the development of new material technology in recent decades. The method of cement grouting firstly, then chemical compound next was proved to improve the strength and anti-permeability of weak rock effectively and greatly. Based on the various field tests, cement chemical compound grouting has successfully applied to the treatments of the weak parts of dam foundation in important area, result in significant increase of their sonic speeds, deformation modules, anti-seepage abilities, integrities and stiffness. According to the feedback analysis of dam structure during the third impoundment stage, cement chemical compound grouting has been successfully applied in the Jinping I arch dam foundation treatment, and solved one of the critical technical problems of high arch dam construction. ©, 2015, Academia Sinica. All right reserved.

Liu Y.,PowerChina Chengdu Engineering Corporation Ltd | Deng H.,Chengdu University of Technology | Huang R.,Chengdu University of Technology
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2015

In the region of slab-rent structure rock mass, the representative rock blocks (i.e., slab rupture protolith), in which the slab rupture has occurred, were selected. To obtain the anisotropic properties for related strength parameters, the uniaxial compression tests with the loading direction vertical and parallel to slab rupture direction are performed. At the same time, the analysis of mesoscopic morphology of rupture surface is conducted using scanning electron microscope (SEM). In order to provide the theoretical basis for the rock mass slab rupture, we try to explore the potential inherent connection among the rock mass slab rupture, rock mechanical properties and its composition. The study shows that: the protolith with slab rupture has anisotropic characteristics and close relation with the direction of slab rupture;under the same magnitude of load, the load parallel to the direction of slab rupture is more likely to cause deformation and failure of potential slab-rent rock mass than the load vertical to the slab rupture direction;when the load is vertical to the direction of slab rupture, the rupture surface often shows both transgranular and intergranular fratures but the latter one dominates;when the load is parallel to the direction of slab rupture, the rupture surface is relative smooth and the area with intergranular fracture is larger than the area with transgranular fracture;the defects and damage in the slab rupture protolith are nearly parallel to the direction of slab rupture, and they are not only the foundation of slab rupture, but also be further developed due to the occurrence of slab rupture. ©, 2015, Academia Sinica. All right reserved.

Yan B.,University of Sichuan | Yan B.,PowerChina Chengdu Engineering Corporation Ltd | Long E.,University of Sichuan | Meng X.,University of Sichuan
Energy Conversion and Management | Year: 2015

This paper proposes a methodology of performance assessing of envelops under different cooling operation conditions, by focusing on indoor temperature change and dynamic thermal behavior performance of walls. To obtain a general relationship between the thermal environment change and the reaction of envelop, variously insulated walls made with the same insulation material are separately built in the same wall of a testing building with the four different structures, namely self-heat insulation (full insulation material), exterior insulation, internal insulation and intermediate insulation. The advantage of this setting is that the test targets are exposed to the same environmental variables, and the tests results are thus comparable. The target responses to two types of perturbations, cooling temperature and operation time were chosen as the important variations in the tests. Parameters of cooling set temperature of 22 °C and 18 °C, operation and restoring time 10 min and 15 min are set in the test models, and discussed with simulation results respectively. The results reveal that the exterior insulation and internal insulation are more sensitive to thermal environment change than self-heat insulation and intermediate insulation. © 2015 Elsevier Ltd. All rights reserved.

Li G.,PowerChina Chengdu Engineering Corporation Ltd
Advances in Science and Technology of Water Resources | Year: 2014

In order to investigate the effect of low heat Portland cement on concrete dam volume stability, we applied the test method according to the Hydraulic Concrete Testing Procedures (SL 352-2006) regulations. Overall, the experimental studies show: low heat Portland cement concrete has characteristics of low temperature deformation, low shrinkage and reducing swelling alkali reactivity. Further, compared with moderate heat Portland cement, low heat Portland cement concrete can increase the volume stability of dam. ©, 2014, Advances in Science and Technology of Water Resources. All right reserved.

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