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对基于上升管荒煤气温度的火落管理的研究 被引量:3
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作者 王慧璐 刘光斌 +2 位作者 杨光 吴迪 申妍 《燃料与化工》 2016年第2期1-2,5,共3页
提出了一种基于火落管理的焦炉加热管理方法,该方法可用于判别当前焦饼成熟情况、炉温分布情况和一段时间范围内的炉温稳定情况,还可用于评定一段时期范围内的焦炭质量,为焦炉操作和热工调火提供指导依据。
关键词 火落管理 Tmax时间 均匀系数 安定系数
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焦炉结焦过程的研究与实践 被引量:2
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作者 刘晓东 李刚 刘冰 《燃料与化工》 2008年第3期16-18,共3页
文中对结焦过程进行了全面的理论分析,提出了结焦终了、结焦过程指数、结焦均匀系数和结焦安定系数概念,以及评定结焦过程指标系数的定义方法。该方法的实施,实现了结焦过程的管理与操作管理以及焦炭质量控制三位一体的新型焦炉管理模式... 文中对结焦过程进行了全面的理论分析,提出了结焦终了、结焦过程指数、结焦均匀系数和结焦安定系数概念,以及评定结焦过程指标系数的定义方法。该方法的实施,实现了结焦过程的管理与操作管理以及焦炭质量控制三位一体的新型焦炉管理模式,为改善和发展焦炉的管理模式奠定了理论基础。 展开更多
关键词 结焦终了 结焦过程指数 均匀系数 安定系数
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Landslide stability for Shuitianba in the Three Gorges area 被引量:6
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作者 YANG Zhishuang XI Panpan JIN Jianfu 《Global Geology》 2012年第3期221-224,共4页
According to the data of preliminary survey, the authors established a landslide geological model,on the basis of analyses on the sensitivity of landslide, tried to simulate and calculate the landslide stability of Sh... According to the data of preliminary survey, the authors established a landslide geological model,on the basis of analyses on the sensitivity of landslide, tried to simulate and calculate the landslide stability of Shuitianba with the method of transfer coefficient when it is under different strength parameters, and study the landslide mechanism. The results show that it is sensitive to the effects of shear strength parameters of sliding zone and groundwater level on landslide stability safety coefficient, which provides reliable basis for calculation of landslide stability. 展开更多
关键词 Shuitianba landslide stability sensitivity analysis transfer coefficient method
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Three-dimensional analysis of slopes reinforced with piles 被引量:8
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作者 高玉峰 叶茂 张飞 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第6期2322-2327,共6页
Based on the upper bound of limit analysis, the plane-strain analysis of the slopes reinforced with a row of piles to the 3D case was extended. A 3D rotational failure mechanism was adopted to yield the upper bound of... Based on the upper bound of limit analysis, the plane-strain analysis of the slopes reinforced with a row of piles to the 3D case was extended. A 3D rotational failure mechanism was adopted to yield the upper bound of the factor of safety. Parametric studies were carried out to explore the end effects of the slope failures and the effects of the pile location and diameter on the safety of the reinforced slopes. The results demonstrate that the end effects nearly have no effects on the most suitable location of the installed piles but have significant influence on the safety of the slopes. For a slope constrained to a narrow width, the slope becomes more stable owing to the contribution of the end effects. When the slope is reinforced with a row of piles in small space between piles, the effects of group piles are significant for evaluating the safety of slopes. The presented method is more appropriate for assessing the stability of slopes reinforced with piles and can be also utilized in the design of plies stabilizing the unstable slopes. 展开更多
关键词 three-dimensional rotational failure mechanism stability of slopes limit analysis LANDSLIDES PILES
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Upper bound analysis of slope stability with nonlinear failure criterion based on strength reduction technique 被引量:24
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作者 赵炼恒 李亮 +2 位作者 杨峰 罗强 刘项 《Journal of Central South University》 SCIE EI CAS 2010年第4期836-844,共9页
Based on the upper bound limit analysis theorem and the shear strength reduction technique, the equation for expressing critical limit-equilibrium state was employed to define the safety factor of a given slope and it... Based on the upper bound limit analysis theorem and the shear strength reduction technique, the equation for expressing critical limit-equilibrium state was employed to define the safety factor of a given slope and its corresponding critical failure mechanism by means of the kinematical approach of limit analysis theory. The nonlinear shear strength parameters were treated as variable parameters and a kinematically admissible failure mechanism was considered for calculation schemes. The iterative optimization method was adopted to obtain the safety factors. Case study and comparative analysis show that solutions presented here agree with available predictions when nonlinear criterion reduces to linear criterion, and the validity of present method could be illuminated. From the numerical results, it can also be seen that nonlinear parameter rn, slope foot gradient ,β, height of slope H, slope top gradient a and soil bulk density γ have significant effects on the safety factor of the slope. 展开更多
关键词 nonlinear failure criterion strength reduction method upper-bound theorem of limit analysis slope stability analysis factor of safety
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Three-dimensional stability of landslides based on local safety factor 被引量:4
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作者 YANG Tao Man-chu Ronald YEUNG +2 位作者 YANG Bing LIU Yong-jiang YANG Yan-xin 《Journal of Mountain Science》 SCIE CSCD 2016年第9期1515-1526,共12页
Unlike the limit equilibrium method(LEM), with which only the global safety factor of the landslide can be calculated, a local safety factor(LSF) method is proposed to evaluate the stability of different sections of a... Unlike the limit equilibrium method(LEM), with which only the global safety factor of the landslide can be calculated, a local safety factor(LSF) method is proposed to evaluate the stability of different sections of a landslide in this paper. Based on three-dimensional(3D) numerical simulation results, the local safety factor is defined as the ratio of the shear strength of the soil at an element on the slip zone to the shear stress parallel to the sliding direction at that element. The global safety factor of the landslide is defined as the weighted average of all local safety factors based on the area of the slip surface. Some example analyses show that the results computed by the LSF method agree well with those calculated by the General Limit Equilibrium(GLE) method in two-dimensional(2D) models and the distribution of the LSF in the 3D slip zone is consistent with that indicated by the observed deformation pattern of an actual landslide in China. 展开更多
关键词 Landslide stability Local safety factor Stability analysis method Slip mechanism
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Study for reasonable value of friction coefficient between main cable and saddle 被引量:2
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作者 Deng Ting Luo Xiheng 《Engineering Sciences》 EI 2012年第3期72-76,共5页
The value of friction coefficient between the main cable and saddle, relates to not only the anti-slippage stability of three-tower suspension bridge, but also the reasonable stiffness of the middle tower and the magn... The value of friction coefficient between the main cable and saddle, relates to not only the anti-slippage stability of three-tower suspension bridge, but also the reasonable stiffness of the middle tower and the magnitude of rigidity of the whole bridge. First, the paper does some comparative studies about the relevant provisions of international norms, and then, summarizes the relevant load test results both at home and abroad. Finally, the paper draws the appropriate anti-slippage safety factor for the most unfavorable load in accordance with international load standards, and discusses the rationality and feasibility of the friction coefficient of 0.2 between main cable and saddle. 展开更多
关键词 three-tower suspension bridge middle tower main cable SADDLE anti-slippage safety factor load standard
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A new double reduction method for slope stability analysis 被引量:15
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作者 白冰 袁维 李小春 《Journal of Central South University》 SCIE EI CAS 2014年第3期1158-1164,共7页
The core of strength reduction method(SRM) involves finding a critical strength curve that happens to make the slope globally fail and a definition of factor of safety(FOS). A new double reduction method, including a ... The core of strength reduction method(SRM) involves finding a critical strength curve that happens to make the slope globally fail and a definition of factor of safety(FOS). A new double reduction method, including a detailed calculation procedure and a definition of FOS for slope stability was developed based on the understanding of SRM. When constructing the new definition of FOS, efforts were made to make sure that it has concise physical meanings and fully reflects the shear strength of the slope. Two examples, slopes A and B with the slope angles of 63° and 34° respectively, were given to verify the method presented. It is found that, for these two slopes, the FOSs from original strength reduction method are respectively 1.5% and 38% higher than those from double reduction method. It is also found that the double reduction method predicts a deeper potential slide line and a larger slide mass. These results show that on one hand, the double reduction method is comparative to the traditional methods and is reasonable, and on the other hand, the original strength reduction method may overestimate the safety of a slope. The method presented is advised to be considered as an additional option in the practical slope stability evaluations although more useful experience is required. 展开更多
关键词 slope stability strength reduction method double strength reduction method factor of safety limit equilibrium method
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A new hybrid algorithm for global optimization and slope stability evaluation 被引量:3
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作者 Taha Mohd Raihan Khajehzadeh Mohammad Eslami Mahdiyeh 《Journal of Central South University》 SCIE EI CAS 2013年第11期3265-3273,共9页
A new hybrid optimization algorithm was presented by integrating the gravitational search algorithm (GSA) with the sequential quadratic programming (SQP), namely GSA-SQP, for solving global optimization problems a... A new hybrid optimization algorithm was presented by integrating the gravitational search algorithm (GSA) with the sequential quadratic programming (SQP), namely GSA-SQP, for solving global optimization problems and minimization of factor of safety in slope stability analysis. The new algorithm combines the global exploration ability of the GSA to converge rapidly to a near optimum solution. In addition, it uses the accurate local exploitation ability of the SQP to accelerate the search process and find an accurate solution. A set of five well-known benchmark optimization problems was used to validate the performance of the GSA-SQP as a global optimization algorithm and facilitate comparison with the classical GSA. In addition, the effectiveness of the proposed method for slope stability analysis was investigated using three ease studies of slope stability problems from the literature. The factor of safety of earth slopes was evaluated using the Morgenstern-Price method. The numerical experiments demonstrate that the hybrid algorithm converges faster to a significantly more accurate final solution for a variety of benchmark test functions and slope stability problems. 展开更多
关键词 gravitational search algorithm sequential quadratic programming hybrid algorithm global optimization slope stability
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Pseudo-dynamic analysis of overturning stability of retaining wall 被引量:4
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作者 王奎华 马少俊 吴文兵 《Journal of Central South University》 SCIE EI CAS 2011年第6期2085-2090,共6页
A new method was presented to determine the safety factor of wall stability against overturning based on pseudo-dynamic approach. In this time-dependent method, the actual dynamic effect with variation of time and pro... A new method was presented to determine the safety factor of wall stability against overturning based on pseudo-dynamic approach. In this time-dependent method, the actual dynamic effect with variation of time and propagation of shear and primary wave velocities through the backfills was considered. Planar failure surface was considered behind the retaining wall. The results were compared with those obtained from Mononobe-Okabe theory. It is found that there is a higher value of safety factor by the present dynamic analysis. The effects of wall inclination, wall friction angle, soil friction angle and horizontal and vertical seismic coefficients on the overturning stability of retaining wall were investigated. The parametric study shows that both horizontal and vertical seismic accelerations have decreasing effect on the overturning stability of retaining wall. 展开更多
关键词 seismic active force pseudo-dynamic method EARTHQUAKE stability against overturning retaining wall
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Reinforcement strength reduction in FEM for mechanically stabilized earth structures
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作者 薛剑峰 陈建峰 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第7期2691-2698,共8页
The factor of safety of mechanically stabilized earth(MSE) structures can be analyzed either using limit equilibrium method(LEM) or strength reduction method(SRM) in finite element/difference method. In LEM, the stren... The factor of safety of mechanically stabilized earth(MSE) structures can be analyzed either using limit equilibrium method(LEM) or strength reduction method(SRM) in finite element/difference method. In LEM, the strengths of the reinforcement members and soils are reduced with the same factor. While using the SRM, only soil strength is reduced during the calculation of the factor of safety. This causes inconsistence in calculating the factor of safety of the MSE structures. To overcome this, an iteration method is proposed to consider the strength reduction of the reinforcements in SRM. The method is demonstrated by using PLAXIS, a finite element software. The results show that the factor of safety converges after a few iterations. The reduction of strength has different effects on the factor of safety depending on the properties of the reinforcements and the soil, and failure modes. 展开更多
关键词 mechanically stabilized earth structures factor of safety strength reduction method iterative method
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浅谈提高焦炉热工系数的方法
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作者 何江 《冶金管理》 2019年第17期2-3,共2页
焦炉热工系数是反映焦炉加热温度均匀性的重要指标,在一定程度上反映了焦炉温度的管理水平。热工系数的高低与焦炭质量、炼焦能耗等指标息息相关,如何科学有效的提高热工系数,是焦炉热工管理的主要工作之一。
关键词 安定系数 均匀系数 横排系数 炉头系数
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Hybrid method of limit equilibrium and finite element internal force for analysis of arch dam stability against sliding 被引量:6
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作者 BAO TengFei1,2,3,XU BaoSong1,2,3 & ZHENG XueQing1,2,3 1State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210098,China 2National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety,Nanjing 210098,China 3College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第4期793-798,共6页
A hybrid method of limit equilibrium and finite element internal force for analysis of arch dam stability against sliding is presented.The finite element internal force method(FEIFM) is used to provide more accurate t... A hybrid method of limit equilibrium and finite element internal force for analysis of arch dam stability against sliding is presented.The finite element internal force method(FEIFM) is used to provide more accurate thrust forces acting on the faces of a slip body,and the limit equilibrium method(LEM) is employed to evaluate the factor of safety of the slip body.The method presented can deal with a slip body with large amount of geometrically complex slip faces.In addition,compared with the traditional LEM,it can meet the balance condition of the forces in the slip faces.An example shows that the factor of safety obtained by the method presented agrees well with the theoretical solution.A practical example is also presented to demonstrate the application of the method in the stability analysis of an arch dam project.The results from the examples show that the method is promising in analysis of arch dam stability against sliding. 展开更多
关键词 arch dam stability against sliding limit equilibrium method finite element internal force method
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Exponential Stability of a Robot with Safety System
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作者 Lihua Jin Aidong Jin Yufeng Zhang 《Journal of Systems Science and Information》 2009年第3期201-214,共14页
This paper presents the analysis of exponential stability of a system consisting of a robot and its associated safety mechanism. The system have various modes of failures and is repairable. The paper investigates the ... This paper presents the analysis of exponential stability of a system consisting of a robot and its associated safety mechanism. The system have various modes of failures and is repairable. The paper investigates the nonnegative stead-state solution of system,the existence of strictly dominant eigenvalue and restriction of essential spectrum growth bound of the system operator. The essential spectral radius of the system operator is also discussed before and after perturbation. The results show that the dynamic solution of the system is exponential stab'flity and converges to the steady-state solution. 展开更多
关键词 repairable system nonnegative solution simple eigenvalue strictly domi- nant eigenvalue essential spectrum PERTURBATION exponential stability
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