-
Research and Construction Control Points of Vertical Jacking Technology of Water Diversion Tunnel
Issue:
Volume 4, Issue 2, June 2018
Pages:
16-22
Received:
2 June 2018
Accepted:
19 June 2018
Published:
21 July 2018
Abstract: Taking the circulating water diversion tunnel project of a large power plant as an example, a new type of underground excavation technology, namely vertical jacking construction technology was studied. The reaction force of the bottom of the tunnel was calculated accurately by establishing the calculation model, and the countermeasures to overcome the reaction force were put forward. At the same time, the vertical jacking process, control points and monitoring content were discussed. Through the above research and analysis, it can provide reference and help for the construction of similar projects, and promote the further development of the technology.
Abstract: Taking the circulating water diversion tunnel project of a large power plant as an example, a new type of underground excavation technology, namely vertical jacking construction technology was studied. The reaction force of the bottom of the tunnel was calculated accurately by establishing the calculation model, and the countermeasures to overcome ...
Show More
-
Influence of Geomechanical and Hydraulic Parameters of the Fractured Rock on the Evolution of Underground Karst Cavities in Cheria Area, NE Algerea
Chamekh Khemissi,
Djemmal Samir,
Boukhalfa Adel,
Baali Fethi
Issue:
Volume 4, Issue 2, June 2018
Pages:
23-27
Received:
13 January 2018
Accepted:
12 June 2018
Published:
24 July 2018
Abstract: The main goal of this study is to analyze the surface part of the karst and some underground characteristics of Eocene karst system. The Karst cavities are widespread in the Eocene forming the upper formation under the Quaternary cover in the Cheria syncline. Therefore, the karstfied zone requires new methods for estimating average depth of the karts cavities from structural, geometrical, and mechanical properties of fractured rock. In that way, statistical methods is very efficient for describing in detail the shallow part of karst cavities, when Eocene limestone outcrops at the surface in the center and northern of the basin. A stochastic analysis is carried out to evaluate the influence of correlations between relevant distributions on the simulated RMR values, also to simulate the cavity depth. The model is also used in Monte Carlo simulations. The statistical analysis showed that Rock Mass Rating (RMR) depends on the hydraulically and geomechancal parameters. Naturally it is always possible to simulate a cavity depth (PKR) by several hydraulically and geometrical parameters of fractures (uniaxial compressive strength; RC), Rock Quality Designation (RQD), Spacing fracture (EJ), inflow per 10 tunnel length (D10m.L), friction cording of the angle of the rock mass (CD-I.j), layer depth (Pc), average aperture to each group of the fracture (di), average fracture frequency to each group of the fracture (fi), fracture depth (dfi)), especially in the case of k non real fracture geometry. The study of the relations between geomechanical fractured rock and fracture geometry, we can simulate any cavity depth (PRK) in Chera syncline.
Abstract: The main goal of this study is to analyze the surface part of the karst and some underground characteristics of Eocene karst system. The Karst cavities are widespread in the Eocene forming the upper formation under the Quaternary cover in the Cheria syncline. Therefore, the karstfied zone requires new methods for estimating average depth of the kar...
Show More
-
Treatment of Restaurant Waste Water with Al2O3 Ceramic Membrane
Wanying Li,
Linnan Zhang,
Dehai Mu,
Yi'an Pei,
Yanfang Ma,
Mingyang Ma,
Wenyuan Dou
Issue:
Volume 4, Issue 2, June 2018
Pages:
28-32
Received:
7 June 2018
Accepted:
17 July 2018
Published:
14 August 2018
Abstract: With the improvement of people's living standard, the phenomenon of waste on dinner table is becoming more and more serious, and the amount of waste produced by food and kitchen is increasing rapidly. At present, scholars at home and abroad mainly focus on the treatment of solid kitchen waste, and there are few reports on the treatment of catering wastewater. The characteristics of high concentration of organic matter, complex composition and high oil content in the kitchen wastewater determine that the degradation efficiency of the traditional treatment process will be very low, so it is very important to study different treatment processes for the treatment of kitchen wastewater. The self-made Al2O3 ceramic membrane was developed to treat the catering wastewater which is the pollution sources of high concentration causing great pollution to the water around the city. The effects of feed liquid content, feed liquid flow rate, operating pressure and feed temperature on membrane flux, oil droplets and COD removal rate were studied. The result shows that the optimized filtration condition was that the feed liquid was the raw material liquid, the volume flow rate of the feed liquid was 200 L/h, the operating pressure was 160 kPa, and the feed liquid temperature was 25°C. Under the optimized filter conditions, when the membrane was cleaned by homemade alkaline chemical cleaning agents, the regeneration performance of membranes was well and could recovered to more than 95% of original ones.
Abstract: With the improvement of people's living standard, the phenomenon of waste on dinner table is becoming more and more serious, and the amount of waste produced by food and kitchen is increasing rapidly. At present, scholars at home and abroad mainly focus on the treatment of solid kitchen waste, and there are few reports on the treatment of catering ...
Show More
-
Study on Regional Water Resources Allocation Efficiency Based on Networking and Joint Scheduling of Reservoir Groups
Issue:
Volume 4, Issue 2, June 2018
Pages:
33-39
Received:
20 June 2018
Accepted:
6 August 2018
Published:
31 August 2018
Abstract: The effect of reservoir group networking and joint scheduling on the efficiency of regional water resources allocation is studied in the paper and demonstrated by case analysis of two engineering projects in the counties of Zhejiang Province. The efficiency of water resources allocation involves both engineering and economic aspects, and its improvement is the result of the interaction between institutions and technologies. The efficiency of networking and joint scheduling of reservoir groups is obvious, as proved by the physical network created by joint scheduling, the internal incentive mechanism generated by water right transactions, as well as the networking and joint scheduling of agricultural irrigation, urban water supply and ecological water use. This efficiency mainly comes from the accumulation of reservoir resources and the rational utilization of flood resources brought by networking and joint scheduling. It would be an important model for the future development of regional water resources optimization to network and jointly operate reservoir groups. In essence, the networking and joint scheduling of a reservoir group involve the optimal allocation and operation of multi-source water resources for multi-users. The scheduling diagram can be regarded as the combination of diversion and water supply dispatch of each member reservoir, forming the network structure, realizing the joint operation of regional water resources, and finally improving the efficiency of water resources allocation at different stages in different regions. The main body of the reservoir networking and joint scheduling, the government departments, carry out planned dispatching of reservoirs only with obtaining certain amount of information. It is therefore necessary to establish an incentive compatibility mechanism to overcome such defects as information lag and asymmetry, in networking and operating reservoir groups.
Abstract: The effect of reservoir group networking and joint scheduling on the efficiency of regional water resources allocation is studied in the paper and demonstrated by case analysis of two engineering projects in the counties of Zhejiang Province. The efficiency of water resources allocation involves both engineering and economic aspects, and its improv...
Show More
-
Mechanism of the Original Ecology Gravity Irrigation in the Ziquejie Terrace
Li Guiyuan,
Liu Siyan,
Luo Lishun,
Hu Chunyan
Issue:
Volume 4, Issue 2, June 2018
Pages:
40-49
Received:
12 July 2018
Accepted:
31 July 2018
Published:
3 September 2018
Abstract: The Ziquejie Terrace is one of the three famous ancient terraces in China. Rice has been planted in large area with mountains standing and a lot of steep hills. Whatever the weather is drought or rainstorm, the rice can always have a good harvest without water storage facilities. To reveal the mechanism of the original ecology gravity irrigation, several investigations had been developed such as observation of hydrology and meteorology, hydro-geological exploration and dynamic monitoring of groundwater level. According to the results of the experimental observations, this article proposed a suit of perfect theories and methods, such as the nonlinear autonomic regulation theory and “the ground water reservoir on the same slope position” theory in ancient terrace area. Further more, the calculation model of the original ecology gravity irrigation water cycle balance was established and a set of theories and methods of the water cycle balance calculation were formed on the basis of prior theories. Using this model, the process of irrigation water supply and demand balance, as well as the irrigation assurance, was simulated at rice growth stages in the original gravity irrigation area and its surrounding artificial irrigation area. The results showed that there is a highly consistency between the simulation results and the measured results, and it revealed the mechanism of ancient ecological gravity irrigation profoundly in terraces area. The result of study has important directive significance to the exploitation and protection of the terrace in China and has important reference value to the exploitation of the slope farmland.
Abstract: The Ziquejie Terrace is one of the three famous ancient terraces in China. Rice has been planted in large area with mountains standing and a lot of steep hills. Whatever the weather is drought or rainstorm, the rice can always have a good harvest without water storage facilities. To reveal the mechanism of the original ecology gravity irrigation, s...
Show More
