Applied Mechanics and Materials Vols. 170-173

Abstract: Super chloride saline soil with 12.5% soluble salt is stabilized by self-made stabilizer S, and the influence of early low-temperature curing to the strength of the stabilized soil is studied through the laboratory tests and the field tests. The results indicate that the strength of the stabilized soil increase slowly when they are cured in low-temperature. The strength of the stabilized soil cured in 5°C at 28-days age is only 44.7% of the standard strength. However, if the curing temperature rises to the standard temperature after 28-days age, the strength can reach the 28-days age standard strength after 150-days age.

Abstract: Soil dynamic nonlinear experimental results have significant impacts on the seismic response of engineering site, but how reasonable and effective to select soil samples for soil test, there is no good solution. Using detailed drilling velocity, density data, and rich soil test data of Shanxi Linfen Iron and Steel Hospital engineering site, four models are established and are analyzed for this problem. The results showed that: less than 3 meters of soil layer, each layer select one soil sample, for the thick soil layer, the rules of selecting one soil sample about every 3m thickness for the soil test, are recommended. If selecting one soil sample about every 5m~6m thickness for the thick soil layer, the calculation error is about ±10%.

Abstract: Disturbed state concept theory (DSC) utilizes constitutive models to depict material responses. The response is gained by weight-averaging reference responses. DSC also can superpose disturbance factor on reference responses to reach actual response values. Suitable constitutive models give reference responses and DSC revises them to be acceptable outputs. Disturbance factor is independent to constitutive model. On DSC application on seepage problem, combination of DSC and Biot’s consolidation is forwarded by introducing disturbance factor into equilibrium function and extended cam-bridge model provides reference response. On DSC application on anisotropy, anisotropic disturbance factor is applied on to obtain stress anisotropy. Hierarchical single surface model is utilized to provide reference response for further anisotropic revision. Detailed formula derivation for DSC-seepage or for DSC-anisotropy is accomplished. On both applications, the key combination of DSC and other theory depends on the introduction of disturbance factor into equilibrium equation. Outcomes of DSC show readjustment of parameters of disturbance factor guaranties quantity of response descriptions. DSC takes into account of outside effects without changing inside. Existing models and existing methods can be used to describe newly responses.

Abstract: Lightweight aggregates is one of the component materials that affect the performance of concrete directly. This paper researches the high strength and lightweight aggregates through orthogonal test. It points out that apparent density, press strength and 1h water absorption of lightweight aggregate is 1360kg/m3, 6.8 Mpa, 4.1% respectively, which meet the national standards. Shale lightweight aggregates we prepared has the characters of high strength and lightweight. This work will receive highly economic and social benefits in use in the industrial waste residue synthetically and protect environment.

Abstract: In view of Wenzhou saturated super soft soil, This article studied the influence of different soil parameters for the shaft excavation construction and the stratum displacement change law by using Plaxis finite element software, according to the data obtained in field tests. The considered factors included the lateral brace stiffness, the stiffness of the underground diaphragm wall, and the surrounding soil disturbance. The calculation results provided much important engineering information, such as the horizontal displacement nephogram, the vertical displacement nephogram and the total displacement incremental vector diagram of each construction steps, which can be referred for the construction of the similar underground projects in soft soil areas.

Abstract: Prediction of peak particle velocity (PPV) is very complicated due to the number of influencing parameters affecting seism wave propagation. In this paper, artificial neural network (ANN) is implemented to develop a model to predict PPV in a blasting operation. Based on the measured parameters of maximum explosive charge used per delay and distance between blast face to monitoring point, a three-layer ANN was found to be optimum with architecture 2-5-1. Through the analysis of coefficient of determination (CoD) and mean absolute error (MAE) between monitored and predicted values of PPV, it indicates that the forecast data by the ANN model is close to the actua1 values.

Abstract: Using the finite element software ABAQUS, the stress field in one low permeability reservoir is investigated. Genetic algorithm is used to determine the initial stress boundary of the reservoir, seepage-stress element CPE4P in ABAQUS is used to model the rock and beam element B31 is used to model the well group. The numerical simulation results indicate that casing damage can be predicted effectively using the method in this paper.

Abstract: The Lower Yellow River is apt to deposit and migrate. The reach from Huayuankou to Jiahetan is the typical wandering reach, which has broad and shallow body, intertwined tributary and numerous shoals. The mainstream always swings, and the riverbed deforms rapidly. There exist lots of residential places, irrigation canals, roads, productive dikes and other controlling works within the embankments, which greatly limits the scope of flooding. When the peak discharge is very large, the flood is prone to resulting in productive dikes bursting, which will greatly endanger the lives of residents in flood plains. The 2-D water flow mathematical model which reflects flood routing in the reach from Huayuankou to Jiahetan has been developed based on MIKE 21 software in this paper. Through the numerical simulation of the “96.8” typical flood, the simulating results in the condition of present topography are agreement with the measured ones. It shows that this model is basically reasonable in the selection aspects of river terrain, boundary treatment, roughness and water flow parameters, and the model has a reference value.

Abstract: Water resistant fine soil is required to be prepared for the development of an oil contamination control system, which is currently part of an ongoing research topic at the University of Tokyo. For this purpose, Fujinomori clay has been chemically treated in a laboratory to create a form of water proofing on the clay particles. The effectiveness of water repellent properties of the treated Fujinomori clay is articulated by using model tests and image analysis. The basic principle of the image analysis is the variation in soil color, with respect to moisture / fluid content.

Abstract: abstract:Remote sensing technology is playing anincreasingly important role in the investigation and exploration of oil and gasresources. Using thermal infrared remote sensing technology to detect offshoreoil and gas resources is one of new methods, but there are many uncertainties. Inthis paper, MODIS data are used to explore oil and gas resources availabilityin the North Yellow Sea Basinthrough extracting the temperature anomaly areas. Result shows that this methodcan be effective in assisting in exploring undersea oil and gas resources.