作者机构：
[Jun Xiong] Civil and Environmental Engineering Department, University of Alberta, Edmonton, T6G2W2, Canada;[Xiaolan Huang] School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023, China;[Hongling Ma] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, The Chinese Academy of Science, Wuhan, 430071, Hubei, China
通讯机构：
[Jun Xiong] C;Civil and Environmental Engineering Department, University of Alberta, Edmonton, T6G2W2, Canada
关键词：
Bedded salt rock;Gas leakage;Equivalent permeability;Numerical simulation
摘要：
During the long-time operation of salt rock storage cavern, between its formations, damaged interfaces induced by discontinuous creep deformations between adjacent layers will possibly lead to serious gas leakage. In this paper, damaged interfaces are considered as main potential leakage path: firstly in meso-level, gas flow rule along the interface is analyzed and the calculation of equivalent permeability is discussed. Then based on porous media seepage theory, gas leakage simulation model including salt rock, cavity interlayers and interface is built. With this strategy, it is possible to overcome the disadvantage of simulation burden with porous-fractured double medium. It also can provide the details of gas flowing along the damaged zones. Finally this proposal is applied to the salt cavern in Qianjian mines (East China). Under different operation pressures, gas distributions around two adjacent cavities are simulated; the evolvement of gas in the interlayers and salt rock is compared. From the results it is demonstrated that the domain of creep damage area has great influence on leakage range. And also the leakage in the interface will accelerate the development of leakage in salt rock. It is concluded that compared with observations, this new strategy provides closer answers. The simulation result proves its validity for the design and reasonable control of operating pressure and tightness evaluation of group bedded salt rock storage caverns.
作者机构：
[李银平; 刘伟; 施锡林; 杨春和; 马洪岭] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;[黄小兰] Institute of Poromechanics, Wuhan Polytechnic University, Wuhan 430023, China
通讯机构：
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, China
作者机构：
[王兵武; 李银平; 刘俊新; 马洪岭; 刘伟; 杨春和] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China;[黄小兰] Institute of Porous Media Mechanics, Wuhan Polytechnic University, Wuhan, Hubei 430023, China;[刘俊新] School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
通讯机构：
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, China
会议名称：
Global Conference on Civil, Structural and Environmental Engineering / 3rd International Symp on Multi-field Coupling Theory of Rock and Soil Media and its Applications
会议时间：
OCT 20-21, 2012
会议地点：
China Three Gorges Univ, Yichang, PEOPLES R CHINA
会议名称：
2nd SREE Workshop on Applied Mechanics and Civil Engineering (AMCE 2012)
会议时间：
SEP 15-16, 2012
会议地点：
Hong Kong, PEOPLES R CHINA
会议主办单位：
[Huang Xiaolan;Yu Chao] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Hubei, Peoples R China.^[Huang Xiaolan;Ma Hongling] Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China.
会议论文集名称：
Applied Mechanics and Materials
关键词：
Creep;Layered salt rock;Mechanical properties;Numerical simulation;Stability;Storage
摘要：
Numerical and experimental studies including different soft and hard layer thickness were conducted under different pressures for analyzing the effect of interlayers on stability of salt cavern considering shrinkage rate, plastic zone and displacement vectors. The results indicate that: Cavern shrinkage rate is increased appreciably with increased of soft layer thickness and decreased significantly with increased of hard layer thickness. The plastic zone change is not obviously with increased of soft layer thickness but obviously with hard layer and plastic zone are significant differences at layer while cavern including soft layer and hard layer, the soft layer effect on plastic zone is less than hard layer and it is more sensitive to pressure increasing, the fracture of hard layer is more easily than soft layer. Maximum displacements happen at layer while cavern including soft layer and at salt rock while cavern including hard layer. Comprehensive differences effects of soft layer and hard layer to stability of salt cavern storage find that fine hard layer and heavy soft layer are more unfavorable. The results are important to oil-gas storage cavern modeling analysis in laminated salt rock.
摘要：
The purpose of this paper is to summarize the performance of permeable asphalt pavements (PAP) and to recommend future areas of research and development. The development of PAP as an integral part of sustainable drainage systems is reviewed in the context of traditional and modern urban drainage. The difference between the permeable asphalt pavement and the ordinary bituminous concrete pavement is discussed. A description of the seepage calculation model based on the structural characteristics of PAP is presented. And also water level fluctuations of both the water permeable asphalt pavement and the ordinary bituminous concrete pavement are analyzed by comparing their numerical simulation results. Finally the drainage performance of the water permeable asphalt pavement is demonstrated. The long-term effectiveness of permeable pavement as an alternative to traditional impervious asphalt pavement is examined. The simulation results could provide significant guidance for the structure design of water permeable asphalt pavement.
摘要：
During the process of oilfield waterflooding production, bedding slip of strata will happen if high pressure injection water cuts into the mudstone and shale interbed, which is easy to induce casing’s shear failure, especially near the geo-fault. The influence of seepage field on the stress field includes two aspects: on one hand, pore pressure is assumed as a body force and applied to the rock mass;on the other hand, the hydration of mudstone and shale will decrease their rock mechanical properties greatly. Based on the Mohr-Coulomb theory and effective stress principle, the sliding mechanism of interface rock is analyzed. Moreover, the corresponding conceptual model is built, the sliding displacement of mudstone interbed with different formation dip angles are analyzed, and also the Mises stress of casing with different formation dip angles are calculated. The numerical simulation results show that with the formation dip angle increase, the sliding displacement and the Mises stress of casing increased quickly. The numerical simulation analysis provides theoretical guidance and methods to prevent the casing’s shear failure in the field.
摘要：
Multi-tank model is proposed for heavy rainfall infiltration simulation since it can represent the nonlinear transport behavior and give predictions very quickly. On the other hand, because its parameter space is high dimensional, it is difficult to obtain optimal parameters using existing methods. A new optimization approach called modified dynamically dimensioned search (MDDS) is developed for parameters calibration of this new model. It is based on heuristic global search and its adjustment is achieved by dynamically and randomly reducing the number of searching dimensions. Multi-tank model with 32 parameters is applied to an actual case. According to the results, better agreements between observations and calculation results are obtained compared with genetic algorithm. It is clarified that this model is a helpful tool in prediction of water table and stability factor of the slope.
摘要：
During rainfall infiltration process, the groundwater flow in saturated‐unsaturated zone of slope is a two‐phase seepage process of water and gas. Considering Buckley‐Leverett equation, a new mathematical model for saturated‐unsaturated seepage in rock and soil media was presented with the foundation of two‐phase seepage equation of continuity and Darcy’s law. The equations are discretized with finite difference dynamical method, based on which, a new three‐dimensional program is developed. Seepage process in a slope under rain condition was simulated using the new model, pore pressure and water saturation changes were simulated. The calculation case shows that the results obtained by the model are reasonable for saturated‐ unsaturated seepage problem.
关键词：
ant colony algorithm;optimization;layout scheme;comprehensive benefit
摘要：
The regional road network is modeled as a bilaterally connected graph, and the road section property such as traffic capacity, mileage, and congestion degree are treated as the property of the connection weight of the graph. A discrete variables optimization model is proposed to improve the layout of the regional road network. The comprehensive benefits of road network is taken as the optimum objective of the optimization model, which takes the travel time costs, the transportation expenses, overall traffic capacity and etc into account. The road class, the traffic capacity, the congestion degree and etc are treated as discrete optimum variables while the limits of the road network construction investment is taken as the major constrain of the optimization model. To solve the discrete variables optimization model efficiently and acquire the global optimum, an improved. ant colony algorithm is proposed. The optimization of the layout scheme of the road network in Nanyang is taken as an engineering case to verify the methods proposed in the paper
摘要：
With adoption of high pressure water injection, the casing damage will become more and more serious with the developing time. From the process of oilfield production, it can be concluded that casing damage is closely related to seepage field changes. From the types of mechanical deformation, casing damage can be categorized into three groups: extrusion failure, tensile failure and shear failure, which are all induced by seepage. Based on fluid-stress coupling theory, the mechanism of three types of casing damage is analyzed, and also the corresponding conceptual models are built separately. Finally a case study is given. The results show that seepage has great influence on casing damage, and it is necessary to consider the seepage field especially when numerical simulation with the high pressure water injection is done. It was clarified that with the different conceptual models all kinds of water injection pressure threshold limit values can be calculated, which can provide good governing theories and advices for controlling reasonable injection and production pressure and preventing casing damage.
会议名称：
2009 International Conference on Management Science and Engineering(2009管理科学与工程国际会议)
会议时间：
2009-11-01
会议地点：
北京
会议论文集名称：
2009 International Conference on Management Science and Engineering(2009管理科学与工程国际会议)论文集
关键词：
Energy reserves;salt cavern;underground oil and gas storage;bedded salt rock;tightness evaluation
摘要：
Energy reserve is very important to world's sustainable economic growth and national security. Salt cavern has satisfactory performance because of its very low permeability by the self-healing capacity of salt due to viscoplastic deformation of the grains, causing the closure of cracks and pores. Therefore, salt cavern can be used for storing a variety of fluid products ranging from compressed air and hydrogen to LPG, natural gas and crude oil. Considering the unique stratigraphic characteristics of the laminated salt rocks in China, it has great influence on the tightness of salt carven. Based on the foreign successful experience of storage construction and tightness test methods, the salt mines in Jiangsu Jintan, Huibei Yunyin are taken as engineering background, and the in-situ and laboratory test for tightness evaluation is discussed, which will be reference value and practical significance for the research of underground storage construction project and scientific decision making.
会议名称：
The 7th International Conference on Calibration and Reliability Groundwater Modeling(modelCARE2009)(第七届地下水模拟国际学术会议)
会议时间：
2009-09-20
会议地点：
武汉
会议论文集名称：
The 7th International Conference on Calibration and Reliability Groundwater Modeling(modelCARE2009)(第七届地下水模拟国际学术会议)论文集
摘要：
Multi-tank model is a helpful tool for rainfall-groundwater-runoff analysis since it can represent a nonlinear transport behavior and give predictions very quickly. Because of its high dimension, it is typically difficult to obtain optimal model parameters using the existing methods. A new random optimization approach called modified dynamically dimensioned search (MDDS) is introduced for parameters calibration of the new model. It is based on heuristic global search and its adjustment is achieved by dynamically and randomly reducing the number of searching dimensions. Finally multi-tank model with 32 parameters is applied to an actual case, According to the results; good agreement between observed values and calculation results is obtained. The comparison between MDDS and genetic algorithm shows the advantages of new method. It is clarified that multi-tank model with the new parameter determination method is helpful in groundwater table forecasting during rainfall infiltration process.
摘要：
The algorithm of bootstrap filter is proposed for implementing recursive analysis based on Bayesian state estimation and Monte-Carlo method. Compared with many other filters, Bayesian bootstrap filtering has the great advantage because it is not restricted by model assumptions of linearity and/or measurement noise of Gaussian distribution. It has demonstrated a strong potential for signal and image processing applications. In this paper using bootstrap filtering technique, a method of estimating the multi-parameter of nonlinear systems on the basis of input-output data has been suggested. It is applied to a hydrological model, and the numerical simulation results show its suitable ability and effective for the system even in the case of very severe material nonlinearity.
