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To solve the high nonlinear mapping relationship between mechanical parameter and rock performance in underground engineering and to improve the uniqueness of optimal result in parameter recognition, a new multi-information intelligent identification method of rock mechanics parameter is proposed. By coupling neural network and genetic algorithm as an evolutionary algorithm, the global and nonlinear optimization search of mechanical parameters in the method is realized. And by building the associated fitness function to absorb multi-information, the method can improve the uniqueness of searched objective as far as possible. Application in Laxiwa underground powerhouse, the largest underground cavern in Yellow River valley, indicates that the intelligent method is very reliable and efficient in identification of rock mechanics parameter and in assistant design of underground engineering. © (2013) Trans Tech Publications, Switzerland. Source

Tian F.,China Liaohe Petroleum Engineering Co.
Petrochemical Equipment

Seal plays a crucial role in operation of large storage tank, and the poor contact between seal and tank walls under long-term running appear. In view of this situation, the reasons with measurement data in project base are found and this problem by increasing the transition component is solved. According to the owners, this method is simple, safe and reliable. The large storage tank can be reconstructed without stopping running and it's operable. © 2015, Lanzhou Petroleum Machinery Research Institute. All rights reserved. Source

Liu H.-M.,Tongji University | Chu H.-Q.,Tongji University | Chen J.-B.,Tongji University | Zhou X.-F.,Tongji University | And 2 more authors.
Xiandai Huagong/Modern Chemical Industry

The advantages and disadvantages of H2O2, KMnO4, O3 and persulfate in groundwater and soil remediation are compared. The reaction mechanism, the up-to-date research and the practical application of transition metal and heat activated persulfate in restoring groundwater and soil are explained. Moreover, new ideas and problems of practical application of persulfate are discussed in further detail. Finally, the outlooks to persulfate in groundwater and soil remediation are presented. ©, 2015, China National Chemical Information Center. All right reserved. Source

Liu H.-K.,Zhejiang University | Liu H.-K.,China Liaohe Petroleum Engineering Co. | Wu C.-J.,Zhejiang University | Yu F.,Zhejiang Sci-Tech University | Xia T.-D.,Zhejiang University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering

The traditional methods for settlement calculation of composite foundation are unable to consider the effect of load distribution of piles and soils. The differential settlement between the piles and the soils is also difficult to be predicted by these methods. This study concerns the additional stresses in tubular pile-net composite ground induced by embankment load. Based on the Mindlin's solution, the additional stresses caused by pile end resistance, pile shaft resistances inside and outside the pipe are deduced, respectively. The Boussinesq's solution is also used to obtain the additional stress in the soils surrounding the piles. Such improvement that incorporates the Mindlin's and the Boussinesq's solutions is expected to offer better prediction of the differential settlement between the piles and the soils in the tubular-pile composite ground. Finally, the new approach is applied to a case history, and the predictions seem to agree with the measurements fairly well. Source

Xiao L.,LIAONING Technical University | Geng X.,LIAONING Technical University | Pei G.,China Liaohe Petroleum Engineering Co.
Chinese Journal of Environmental Engineering

Using Na2S as the regeneration agent, this study investigated the fixation of heavy metal ions by a bentonite-steel slag composite granular adsorbent and its regeneration after adsorption saturation with Fe2+, Mn2+, Cu2+, and Zn2+. Specifically, this study explored the fixation of heavy metal ions by the adsorbent, the possibility of regeneration, and the adsorption capability after repeated regeneration. The mechanisms of the fixation of metal ions and the regeneration of the adsorbent were explored using SEM (scanning electron microscopy) images. The experimental results showed that Fe2+ was fixed by the adsorbent in the form of FeS precipitate. However, after regeneration by Na2S, the structure of montmorillonite in the adsorbent was altered, resulting in the collapse of the adsorbent into powder. This result indicated that Na2S was not suitable for the regeneration of the adsorbent saturated with Fe2+. In the case of Mn2+, Cu2+, and Zn2+, these metal ions were fixed owing to the formation of metal sulfide precipitates, while the structure of the granular adsorbent was not modified in the regeneration process. After regeneration was performed three times, the removal efficiencies of the adsorbent for Mn2+, Cu2+, and Zn2+ were 94.22%, 83.2%, and 76.30%, respectively, which were far better than the case without regeneration. SEM images further revealed the synergistic effect of Na2S solution as the regeneration agent in terms of enhancing the fixation of metal ions as metal sulfide precipitates and the repeated regeneration of the adsorbent without compromising the adsorption capability. © 2016, Science Press. All right reserved. Source

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