Applied Mechanics and Materials Vols. 580-583

Abstract: An artificial intelligence tools, Adaptive Neuro Fuzzy Inference System (ANFIS), was used in this study to predict the stability of slopes. Data used in this study were 300 various designs of slope. Those designs were created by using Slope/W which calculated factors of safety using various limit equilibrium methods (LEM) such as Bishop, Spencer and Morgenstern-Price. The input parameters consisted of height of slope, H (1–10 m), unit weight of slope material, γ (15-22 kN/m³), angle of slope, θ (11.31°-78.69°), coefficient of cohesion, c (0-50 kN/m²) and internal angle of friction, (20°- 40°) and the output parameter is the factor of safety. To build the fuzzy inference system, 243 rules were used at 60 epochs. The number of membership function for the any input was three and the type of membership function for output was linear. ANFIS obtained regression square (R²) of one for Bishop, one for Janbu, one for Morgenstern-Price and one for Ordinary. The result proved that ANFIS may possibly predict the safety factor with good precision and nearly to the target data.

Abstract: The Static load test of the post-grouting filling pile in Zhengzhou city’s third ring road rapidness project, uses strain gauge and distributed optical fiber to track and monitor the evolution rule of load-settlement, pile body stress, pile side resistance, etc., interprets bearing properties of large diameter post-grouting filling pile, contrasts and analyzes the monitoring data obtained by optical fiber and strain gauge at the same time. The result shows that, the monitoring effect of the pile body stress obtained by distributed optical fiber technology is superior to the strain gauge, but the data of them still needs to verify each other.

Abstract: In accordance of the principles of stress continuousness and displacement coordination, the interactions model of pile and pile, pile and soil are set up;Accoring to the symmetry of the models,1/4 of the models are extracted to set up three-dimension multipile composite foundation models.The flexibility matrix of the three reinforcements are modified to build a global flexibility matrix with the consideration of cushion's compression; Interaction coefficients of the analytic calculation are lower than those of the finite element when pile lengthen is diversity.The comparison between the on-site measured data from the literature review and results of the analytic calculation shows the settlements in the analytic calculation are smaller than those in the measured data, and the model measurements are very close to the curves from the analytic calculation. All these prove that the analytic methods proposed by this research are accurate and may function as a reference to engineering.

Abstract: No sand cushion vacuum preloading method is one of the construction technology for treating the ultra soft soil formed with hydraulic fill at present. The practice is ahead of the scientific research work, as the effect detection technology of the surface-layer improvement is still in the stage of exploration. In this paper, the cone penetration test (CPT) is used to detect the effect of the surface-layer improvement of the ultra soft soil based on one case in Zhejiang province in China. The result shows that the cone tip resistance is at the range of 0.08 ~ 0.40MPa and the thickness varies about 1.5 to 2.2 m of the treated ultra soft soil. The cone tip resistance along the depth has two kinds of curve shape and four zones.

Abstract: Based on the field test of bored piles at wharf detected by low strain reflection wave method, time-history curve features and defect position of intact piles and defective piles contrastively analyzed, with verification of on-site drilled core testing. The reason for discrimination error between specific defect position and actual data when processing low strain reflection wave method are derived, based on the analysis of effect of defective piles strengthened by pressure grouting method retested by low strain testing, practical measures of on-site low strain reflection wave testing are purposed to improve detection accuracy.

Abstract: Zhengzhou East Green high-speed rail block D6 site supporting of deep foundation pit engineering, double row pile composite retaining structure design and data analysis. Through specific examples of projects, based on the measured data shows that support form of the rationality and practicality.

Abstract: Rock anchor foundation can be widely used for the practical transmission line engineering in mountain areas. On strong-weathered sandstone ground, ten sets of uplift static load test of single rock anchor foundation were carried out. Based on the testing results, the typical failure modes and the ultimate uplift bearing capacity of foundations were obtained. Internal force distribution and effective anchorage depth were investigated through stain measurements. Design parameters of rock anchor foundation on sandstone ground were proposed, which can provide a reference for transmission line engineering design.

Abstract: Through to conduct uniaxial compression test on concrete of suffering sulfate attack, the frequency characteristics of acoustic emission signal are analyzed in the corrosion concrete failure process. The results show that: the acoustic emission ringing counts show phases developmental rule with the relative stress increased.When the relative stress is low, acoustic emission signal of the damaged concrete S₁ is intensive and large amplitude, while the acoustic emission signal of the no damage concrete S₀ is active - relative quiet - active - relative quiet and the acoustic emission signal of the damaged concrete S₂ is active - quiet - active.

Abstract: The uniaxial compression test on pre-existing persistent jointed rock cylindrical standard specimen made by high stiffness servo control testing machine, systematic researched the relationship between jointed rock post-peak stress-strain curve, the destroy form of rock masses with dip angles of persistent joints. And the results reveal that: (1) The post-peak stress - strain curves of specimens with joint inclination angle of 15°and complete specimens are basically the same, but the difference of post-peak stress - strain curves of specimens with the joint inclination angle from 30°to 60°and complete specimens is vary greatly; (2) The post-peak failure modes of specimen change with different joint inclination. The research result can reflect mechanics and deformation and damage characteristics under uniaxial compressive loading in the phase of post-peak of rock masses with different dip angle pre-existing persistent joints.

Abstract: Soil mechanics has been developed for a long time and its concept system is basically complete. But there are still some concepts not being defined clearly. The unclear concepts of seepage force are stated from three phenomenological characteristics aspects in this paper. The difference between loaded object and calculated range is cleared. The contact rule of solid phase and liquid phase is illustrated. The mathematical meaning of seepage force is clarified. Though judging the critical hydraulic gradient of soil flow on surface of cohesionless soil, the difference and correlation of the soil particle and clod analysis based on the phenomenological characteristics will be illustrated.