Shandong with the Swiss mining science and technology limited company has fully automated cable, cage cable production lines and other production equipment, is from Shandong University of Science and Technology ( formerly Shandong mine hospital ) mining and other well-known personalities from all walks of life support is composed of a set research and development, manufacturing, sales support mine supplies professional team. Our company with some engineering cases and the field test data, some portion of the indoor test data, using theoretical analysis and numerical simulation methods, the anchor cable lattice beam bracing system bearing mechanism and design calculation of some key issues are studied, for anchor cable lattice beam supporting engineering design provides important reference. The main research contents and results are as follows:

1, through theoretical analysis and numerical simulation of anchorage segment, mutual influence and slope surface additional compression stress transverse attenuation, for anchoring the pitch control standard establish the corresponding theoretical foundation;

In 2, the main failure mechanism of anchor cable is: in the drawing force is larger, anchorage outer end occurred near the plastic deformation, the peak #118alue of the shear stress in the slope body to transfer, grouting surrounding rock and soil due to tensile and shear strength is weakened, anchor for contact surfaces of the progressive shear failure and progressive loss of bearing capacity. The free type anchor, slope surface near the anchor pier buckling can not be ignored;

In 3, according to the anchor load transfer principle and failure mechanism, the contact surface plasticity hardening and softening constitutive relation is simplified to the three fold line constitutive model ( destruction of the phase contact stiffness with zero processing ). Based on the load transfer principle, the contact surface of the constitutive relationship of assumptions and different boundary conditions to establish the anchor P-S theory and on-site pullout test, indoor pullout test and numerical simulation results are in good agreement with. Theory P-S curve in the initial stage is the linear relations, when the contact surface portions into plastic stage is nonlinear, but still as a linear relationship;

4, in the existing design methods, the load bearing mechanism and design parameters on the basis of the study, based on the load transfer mechanism and on-site pullout test obtained by the P-S curve of the new anchor cable design method, and gives corresponding realization process. The method of the simple design parameters can be obtained by field test, can synthetically reflect the actual engineering conditions, good reliability, and can allow the plastic deformation of the quantitative design;

In5, anchor spacing is too large, shallow anchor passive support measures may also be difficult to prevent the loose slope surface slip this problem, from the angle of soil arching effect, the maximum critical anchorage distance derived theoretical expression and the example analysis;

6, the analysis of examples show that, in several traditional analytic method, Winkle method of elastic foundation beam on the lattice beam internal force calculation of relatively good adaptability. According to the Winkle beam analytic method cannot consider lattice beam and anchor medium asking detachment, foundation stiffness and nonlinear problem, the lattice beam internal force influence factors in system analysis, based on MARC development the two times to overcome these shortcomings. The Winkle beam" implant" slope, studies the construction process and construction location on the lattice beam internal force influence;

7, through literature and monitoring data, analysis of the prestress loss of the general rule and its influencing factors. In the MARC computing platform considering coupling effect on changes of generalized KELVIN creep model was two times the development, through the example analysis of the effect of creep on the long term effect of prestress loss. Based on the grey system theory, established time interval and the unequal time interval GM (1,1) forecasting model calculation procedures, through the example analysis clearly indicates their scope of application.

Shandong with the Swiss mining science and technology limited company is willing to all enterprises and institutions to carry out extensive exchanges and cooperation, for you to provide high-end cable, W steel, prestressed anchor bolt, high strength bolt, pipe joint anchor rod, cage cable products and services.