Applied Mechanics and Materials Vols. 353-356

Abstract: Blasting on large mounts of experiments, we construct mathematical model of seismic wave of blast with systems response method and predict waveform of blast seismic wave. The model can reflect the influence of seismic wave from several kinds of factors and can simulate the attenuation low of amplitude and frequency in the whole process of blast seismic wave. It not only simulates better for simple blast seismic wave, but also can get consistent result in simulating porous blast seismic wave.

Abstract: Combined with the foundation pit in the main stage store of Jinan West Railway Station Great Theatre, the design idea of double-row pile supporting structure is proposed. Through theoretic analysis and soil test ,after analyzing the major effect factors, optimization concept is deeply studied. By the implementation of systematic monitoring, while comparing the measured results with the optimized design scheme, some valuable conclusions are obtained.

Abstract: The recent research and development of the reinforced retaining wall is composed of cantilevered reinforced concrete retaining walls which symmetric set on both sides of subgrade and through roadbed width of counter-pulled anchors. The prestressing force can be applied on anchors.The retaining wall has the advantange of high safety, lateral small deformation , wide applicable range and low requirements for the foundation bearing capacity. But due to the lateral restraint of bolt, the soil pressure distributions of retaining wall change a lot. The change will have a significant impact on structures. In order to reveal the reinforced soil retaining wall pressure distributions, laboratory model test was done. The monitoring instruments such as earth pressure cells, anchor rope dynamometers and dial indicators were installed. Research and analysis on the loading process reinforced type soil retaining wall under soil pressure, the lateral earth pressure and anchor rope tension change rule were researched and analysed. The experimental results showed that with the increasing of filling soil height, the retaining wall had a tendency to tilt outward. The basolateral external pressure is larger than the inside pressure. At the same time, anchor tension increased as the top loading increased. Lateral earth pressure distribution is parabolic. Soil pressure around the anchor is larger than other area, the soil arch effect is significant.

Abstract: The natural soft soil foundations often need to be treated for their difficulty to meet the project requirements. Drainage consolidation method is mainly used in highway projects for large area soft soil foundation treatment, which makes soft ground seepage pathways more complicated. Because of the soft soil anisotropy, the permeability of the different directions of soft ground has certain difference. Based on this, using one-dimensional consolidation test, the effects of anisotropy on the deformation and consolidation coefficient of soft soil are researched through compressing the soft soil with increased pressure time for each stage of load at different depths along the direction perpendicular to deposition surface and direction parallel to deposition surface with the designing multi-level loads. The results show that the compressibility of the soft soil at Jiangmen Binjiang new district has obvious anisotropy, that is, the compression amount along the direction perpendicular to the deposition surface is significantly greater than the amount along the parallel direction. With the increasing consolidation pressure, the variation trend of consolidation coefficient obtained from the compression in the two directions is basically the same, the coefficients of three samples at the different depth along the direction perpendicular to the deposition surface is also greater than the parallel direction, and with the increase of sampling depth the differences of the consolidation coefficient will be more obvious. The research results provide reference for the future design of the soft soil foundation at the region.

Abstract: Under the premise of isotropic and continuum cemented tailings and damage proportional to the external doing work, the damage evolution equation and damage evolution constitutive equation were derived by using the strain equivalent principle. Under the consideration of the damage also transferring stress when uniaxial compression, the damage corrected parameter was introduced to obtain the damage evolution constitutive equation containing corrected parameter. Based on the experimental data from the uniaxial compression of cemented tailing, this article validates the theoretical curves consist with the experimental ones under certain damage corrected parameter.

Abstract: Study of mechanical characteristics of structural planes has been significant issue in engineering rock mass stability analysis. The factors that affect the mechanical behavior of structural planes are so complicated that it is quite essential to take an efficient method to quantificationally analyze these factors. Based on the basic principals of analytic hierarchy process (AHP), a structural plane classification method-CSPC method is proposed. It can conduct weight distribution in terms of the complicated factors, assess the structural planes comprehensively and also forecast the planes intensity parameters semiquantitatively. The classification and forecast parameters of structural planes appropriately fit the cases in engineering. Furthermore, the method is easy to master for the engineers and the application can be of great prospect.

Abstract: The frozen soil triaxial test apparatus is the basic equipment to study the mechanics property of the frozen soil. According to the norm of frozen soil test and the construction character of the present mine, the high-performance frozen soil triaxial test apparatus is made which could be used for many type tests, such as the static triaxial shear test, the dynamic triaxial test, the triaxial creep test, the routine triaxial strain route test, the routine triaxial proportion coordination test, the routine triaxial recycle load test, the routine triaxial concretion test and so on. The apparatus can realize the high surround pressure. During the test progress, the test parameter can be set up and the test date can be collected by the computer. The frozen soil triaxial test apparatus is a new type triaxial test apparatus.

Abstract: The filling earth pressure calculation inside the Sunken Large Diameter Cylindrical Structure is very complex. This paper used large-scale finite element software ABAQUS to establish numerical model, and validated it by the experimental data, then analyze the main cause of earth pressure change inside the cylinder.

Abstract: The initial stress of rock is a basic parameter, which can be used for surrounding rock stability analysis, exploitation and support design. By utilizing stress relief method of hollow inclusion with its characters of high precision and obtaining three dimensional stress at one time, we have measured three dimensional stress magnitude and direction in north wing roadway (-850m) and 710 open-off cut (-1000m), respectively. The results show that the horizontal tectonic stress is obvious in this coal area.

Abstract: Based on deformation of adjacent building with shallow foundation of foundation pit excavation, Midas GTS is adopted to establish the finite element model. Through the numerical simulation, the maximum horizontal and vertical displacement in different conditions, Influence of different SMW pile stiffness and influence of different anchor position are analyzed. The results show that (1) horizontal deformation of SMW pile is decreased at the anchor construction; (2) compared with maximum horizontal displacement of SMW pile with 25a25b28a, the maximum horizontal displacement of SMW pile with 28b is increased by 50.9, 43.3, 11.5% respectively; (3) compared with the second anchor at 1.5, 3.5m, the horizontal displacement of adjacent building is minimal by the second anchor at 2.5m.