Applied Mechanics and Materials Vols. 501-504

Abstract: When considering the effect of temperature, consolidation deformation of the soil is a complex multi-physics coupling problem. For soil of different regions, the influence of temperature on soil physical properties vary widely, even presents the opposite result. In order to realize the thermal consolidations characteristics of Ningbo soft clay, this paper selected Ningbo soft clay and done consolidation test with temperature controlled under different temperatures and confining pressures. Combined with the analysis of theory, this paper carried out the reasonable explanation to the experimenting phenomenon. The results show that: temperature increase the penetration rate of the soil by changing the coefficient of the water, thereby accelerating the consolidation process. The degree of consolidation increases with increasing temperature. In the same conditions and time, the higher the degree of consolidation of soil with increasing temperature, and the difference of the degree of consolidation increases with the increase of the difference in temperature. The difference of the degree of consolidation under different temperature increases with time showing a rapid increase in the extreme values first, and then gradually reduced to zero. Therefore, effect of temperature is mainly reflected in the drainage consolidation process less than half the period of time before, and the greater the temperature difference, the impact effect is more obvious.

Abstract: The applicability of the plate body stabilization technology was determined basing on the different treatment methods on soft foundation in Caofeidian areas. It discussed the construction technology and the main points of construction furtherly on the plate body stabilization technology. The soft foundation bearing capacity reached 200kpa and the settlement amount was less than 16mm through static load test after dealing with the soft foundation. The results meet the specifications and project requirements.

Abstract: The target of this paper is to research the change law of the negative friction for after soaking. The negative friction of pile group is measured through the indoor reduced scale model test in loess area. The similarity ratio design, the groove design of the model, the selection of test materials, the design of the ground soil, the layout of measuring point and the research of load method are involved in this test. Through the study on the reduced scale model, it will have a deeper understanding to the mechanism of pile side negative frictional resistance.It also can guide the design and practice of other engineering.

Abstract: This article aims to study the influence of negative skin friction resistance of waterishlogged pile foundation, through indoor scale model test of pile foundation in the loess areas. The program involved in the model similar than design, the model groove design, the selection of test materials, the design of the ground soil, the layout of measuring points and the research of load method in the test. Through the experimental study on the reduced scale model, we can deepen the understanding of the action mechanism of negative skin friction resistance of the pile, which could guide the engineering practice and design.

Abstract: The target of this paper is to get proper information of deformation through monitor the health of a large-scale trial. The slope in the process of the governance and reinforced slope are designed in the test in Zhouqu County, Gansu Province. Through Health Monitoring Test to high slope, the teat is to master deformation and internal force changes of the supporting structure, meanwhile determine the trend of slope deformation. It is possible to send out the warning for slope stability. Through researching the program and analyzing the data of future monitoring, it provides a reliable basis of similar slope engineering for future.

Abstract: LTD-2100 type ground penetrating radar has its own unique data storage format, and the acquisition data is stored in lte format. This article explained in detail the data of lte format, especially illustrated and analyzed the header file parts of the radar data in tabular form. With a practical engineering as an example, the application of Matlab achieved a goal to read the ground penetrating radar, create a graphical user interface (GUI) and display the GPR data on graphical user interface. The actual data processing shows the effectiveness and practicality of the processing technologies.

Abstract: In the construction of hydraulic electric power, softening and slaking of swelling rock is a natural phenomenon, which is a complex process and affects the stability of rock engineering. It is difficult to describe and predict quantitatively the dynamical properties of the soft rock making use of a common method. Grey theory has proven successful in research such a complex system. This paper proposed GM(1,1) model based on remanent error analysis to the experimental fitting value of gargillite mechanical parameters, which is regarded as a new way of describing the nonlinear mechanical properties of soft rock and applied to predict the instability of engineering rockmass.

Abstract: Mining companies intend to solve the problem of waste dump and reduce the production cost by dumping a large number of waste soils to cover slope outside the running tailings. Therefore, in order to discuss the safety of waste dump slope covering in front of the tailings dam, numerical method was adopted to study the seepage-line change law, the pore water pressure and anti-sliding safety before and after the waste dump covering out of tailings dam. The researches show that the key to waste-dump slope safety are the drainage performance of waste dump bottom layer and the anti-sliding safety of waste dump soil. The appropriate waste dump slope work can improves the tailings dams safety and solves the waste dump problem in mining production.

Abstract: The rapid advance of shipbuilding industry generates greater demands on port and waterway engineering. The reconstruction and maintenance of infrastructure supporting shipbuilding industry also has aroused extensive attention. Since the tonnage of ship increases, the bearing capacity of slipway floors can’t meet the working requirement with the moving load of ships. As for the bearing capacity insufficiency, grouting, anchor jacked piles and bored piles are generally used. However, the anchor jacked pile has better practicality and applicability for easier to control construction quality and smaller damage to the original slipway floor. At present, methods based on Winkler foundation model have been more popular in the engineering practice. But Winkler foundation model can’t consider the interaction between pile and soil, the calculated structural internal force of slipway floor is far from the truth. In order to correct Winkler foundation model imperfections in this aspect, this paper provided the method of equivalent bedding value. In terms of area weighted means, the equivalent bedding value of pile and soil in the influence area would be got. Then this weighted area of pile and soil and other areas of soil could be equivalent to springs with different stiffness coefficients for calculating the structural internal force of slipway floor. To some degree, this method reduced the stress concentration on the top of piles and was closely to the reality, remedying some weaknesses of Winkler foundation model. This method may have definite reference value for foundation plate design in engineering application.

Abstract: In order to study liquefaction and failure law of the tailings under the action of blasting vibration, series blasting experiments were done in dry beaches of a small abandoned tailings dam. The explosives was buried in the tailings dry beach face, blasting created blasting crater and arc shaped cracks, and accompanied by sand boil and water eruption. By installing blasting vibration velocity and acceleration sensors on tailings dam dry beach to measure corresponding blasting vibration velocity and acceleration, regression analyses on experimental data, the blasting vibration velocity and acceleration which can cause tailings sand liquefaction and damage are respectively 23.94cm/s and 4.38m/s².