Applied Mechanics and Materials Vols. 638-640

Abstract: A new enhanced Discontinuous Deformation Analysis method (EDDA) in conjunction with Natural Neighbor Interpolative (NNI) bases for modeling the system composed of high order deformable solids is developed. The advantages of NNI lie in its efficiency and the interpolative property when employed as the shape functions. The anchor reinforcement algorithm is also implemented in the EDDA for modeling high order deformable solids. The numerical results of simple problems by using the proposed method agree well with the corresponding analytical results, and certain slope reinforcement problems are also simulated with rational numerical results, which verify efficiency and accuracy of the EDDA.

Abstract: In this paper, the two methods for the finite element analysis of foundation excitation would be proved mathematically equivalent. Although the two methods, i.e. the method of degree-of-freedom transformation and the Lagrange multiplier method, are absolutely different in appearance, but their mathematical essence would be proved completely identical. In other words, although the equations derived from the two methods have different degree-of-freedoms, i.e. the latter much more than the former, while in essence they could be deduced from each other and vice versa. And finally a numerical example will be presented and discussed to demonstrate the correctness of the present theory.

Abstract: The failure damages of granite under cyclic fatigue load were caused by the propagation and coalescent of cracks at mesoscale, so it was helpful to understand the mechanical behaviours of rock by quantitatively investigating on meso-damage of granite. Stress amplitude of 10 MPa and sine wave cyclic loads with five different frequencies of 0.01, 0.02, 0.05, 0.1, 0.2, 0.5, and 1 Hz were adopted as dynamic disturbance. Then, the microtest (SEM) is carried out to study its fractography morphology and the meso-structural images of marble were processed by regional growing theory based on image processing technique. The meso-damage information of granite microcracks was obtained from SEM images. Quantitative analysis of meso-damage characteristics under cyclic fatigue load wase made from angle, length, width and area. The results showed that with the frequency of cyclic load increasing, the dispersion of microcrack growth azimuth value increased and the average of microcrack growth azimuth value fluctuated in the range. It is great helpful for seismic response analysis of the nuclear power factory in Chang Jiang.

Abstract: Long-short composite pile is a widely used ground improvement technique. This study presents the results of finite difference analyzes using FLAC3D software to investigate the deformation behavior of long-short pile composite foundation under rigid foundation. The pile penetration into cushion and displacement distribution in the piles and other parameters are also studied. The results show that settlement is much more significantly affected by long-pile rather than short-pile. On the other hand, long-pile pierce into cushion to bring foundation soil into full play, also makes the advantages of long-short pile composite foundation to be evident.

Abstract: In order to investigate the effects of different lateral loading patterns and boundary conditions, a square double-column piers model was chosen as an example. The statistical results of six time history analyses were taken as the benchmark for comparison research of Pushover analysis with four common lateral loading patterns. The results of numerical analyses indicate that the errors of static loading method are biggest, the constant acceleration method takes second place, and the modal method of the specified vibration mode is smallest. The errors of the M-phi curves method are larger with the increase of axial compression ratio. For square double-column piers, by comparison, the modal method can get more reasonable results.

Abstract: Risk management consists of Risk Identification, Risk Measurement, Risk Assessment, and Risk Monitoring and Control. This paper based on An office building in Dongying, uses Monitoring data to analyze, in order to gain an applicable Risk Management Practice. This article suggest we have to do the survey work well and also should pay attention to the empirical analysis of experts and field technicians at the same time to analyze risk to deep foundation pit engineering.

Abstract: Structural planes in rock mass play a regulatory role in strength, deformation and fracture. It is the primary task to find out spatial distribution of controlling structural planes. The new method of connecting projection of structural planes exposed points into a line is realized by the certain distance from exposed points to the plane. And the plane is determined by its occurrence. Then select the suitable data and project to the ground surface using trigonometric function conversion. Finally connect these projection points into a line. Computation process can be simplified through MATLAB. This new method is applied to draw the exposed trace line of III-class structure in the left dam abutment adits of Yebatan hydroelectric power station in Jinsha river. The results are accurate, which means this method is feasible.

Abstract: An early-warning model of dam safety base on Dynamic FCM-LSSVM was supported to solve the traditional model failure over time. The training set was divided into subsets with different cluster centers method by using FCM algorithm, and then every subset was trained and modeled by using LS-SVM. When making forecasts, the category of the sample belongs was determined firstly. Then the corresponding sub-type model was used to predict and updated on-line. An arch dam safety warning model of deformation was established by using the proposed method. Compared with the standard LS-SVM model, the proposed hybrid model can significantly improve the generalization ability of the model.

Abstract: How to identify and remove the noise of the dam monitoring data is an important work of dam safety-monitoring. The article makes use of a new compromise thres-holding method to de-noise the dam horizontal dam crack width. Afterwards, the article uses the Markov correction model to predict the crack width of the dam body based on the de-nosing data. In order to identify the effectiveness of the model, the article makes a comparison between the results of the above method with that of the multiple regression method. And the results show that the method of the article is of effective.

Abstract: Rubber dam is a type of soft shell hydraulic structure, which is rechargeable and scalable. Relative to other hydraulic structure that has the same function, rubber dam has many advantages, low cost, short construction period, simple to operation and maintenance, and long service life. Rubber dam is now widely used in industrial and agricultural production, which have improved the ecological environment and cityscape. The Fuqing River, whose water is stench, dirty, have been seriously affecting the city appearance. This paper discusses on construction three-level cascade rubber dam in the Fuqing River to improve the water quality. Build those rubber dams project on the Fuqing River, which not only improve the water quality, beautify the environment, improve the urban ecological environment, create good environment for residents living, can also create social and economic benefits.