Anchoring rod-anchor cable collaborative bearing support parameter intelligent design method and system

Abstract

An anchor rod-anchor cable collaborative bearing support parameter intelligent design method and system belong to the coal mine roadway support technical field, the method is: obtaining basic parameters; anchor rod length double constraint design, determining the anchoring section end depth; solving anchor cable length; introducing stress interference coefficient and calibrating parameters, constructing system collaboration degree and taking its maximization as the target to optimize parameters; through design deformation difference checking time sequence collaborative mode, monitoring actual deformation, dynamically checking collaborative state. The system: the geological parameter acquisition unit collects the geological mechanics parameters of the roadway surrounding rock; the monitoring data acquisition unit collects the support structure working state response; the collaborative design unit outputs the anchor rod-anchor cable collaborative support parameter scheme according to the geological parameters; the dynamic checking and evolution unit verifies the parameter rationality; the visual decision unit presents the related data in a graphical form. The present application can improve the design reliability, material utilization efficiency and long-term safety of anchor rod-anchor cable combined support under deep roadway and complex geological conditions.

Claims

1. A support parameter intelligent design method for anchor rod-anchor cable collaborative bearing, characterized in that, Includes the following steps: S1: Obtain basic parameters; obtain the geomechanical parameters of the surrounding rock and the performance parameters of the support materials through field detection and indoor testing; S2: Anchor length dual constraint design; ensuring that the anchor length simultaneously meets geometric and mechanical constraints, and determining the depth at the end of the anchoring section as the starting point for subsequent spatial coordination; S3: Spatial collaborative solution of anchor cable length; Starting from the end of the anchor bolt anchoring section, calculate the collaborative suspension thickness towards the deep stable rock layer, consider the differences in mechanical properties of each rock layer to calculate the equivalent suspension thickness, form a spatial collaborative solution relationship and determine the length of the free section of the anchor cable; S4: stress interference coefficient determination; introduce stress interference coefficient Quantify the adverse effects of the superposition of anchor rod and anchor cable stress fields and determine the model parameters through field calibration; S5: System Coordination Degree Construction and Optimization; Defining the system coordination degree that comprehensively reflects the utilization of anchor bolt and anchor cable material strength and the weakening effect of stress interference. With the goal of maximizing synergy, the parameters are optimized under multiple constraints. S6: Timing-based collaborative verification; Define the design deformation level difference The difference between the allowable elongation of the free section of the anchor cable and the allowable elongation of the free section of the anchor rod; by judging whether the design deformation level difference meets the preset pressure allowance, the timing coordination mode is verified to be formed; S7: On-site monitoring and dynamic verification; Multiple displacement gauges are installed at different depths in the roadway roof to continuously monitor the actual deformation of the free sections of the anchor bolts and anchor cables, calculate the measured deformation difference, and compare it with the design deformation difference to determine whether the coordinated state deviates from the design target.

2. The intelligent design method for support parameters of anchor bolt-anchor cable cooperative bearing according to claim 1, characterized in that, Also includes S8: Parameter Inversion and Evolution; When the measured deformation difference deviates from the design value, the key parameters are corrected by inversion based on the monitoring data; the corrected parameters are stored in the knowledge base and a machine learning model is trained to establish a mapping relationship between geological conditions and optimal support parameters.

3. The intelligent design method for support parameters of anchor bolt-anchor cable cooperative bearing according to claim 1, characterized in that, In S1, the process of obtaining the basic parameters is as follows: S11: Determine the depth of the loosened zone of the surrounding rock in the tunnel using borehole television or ultrasonic detection. ; S12: Obtain the physical and mechanical parameters of each rock layer in the roof through core drilling and laboratory tests. These parameters include residual strength. , No. Rock layer thickness , bulk density and uniaxial compressive strength ; S13: Obtain the original rock stress field through in-situ stress testing; S14: Determining the radius of the plastic zone of the surrounding rock by borehole inspection ; S15: Identify rock integrity indicators using borehole television or ultrasonic testing. The depth of the top of the continuous rock strata is taken as the location of the deep stable rock strata. ; S16: Obtain the ultimate elongation of the anchor bolt through material tensile testing. Ultimate elongation of anchor cables Anchor bolt yield load Anchor cable yield load .

4. The intelligent design method for support parameters of anchor bolt-anchor cable cooperative bearing according to claim 1, characterized in that, In S2, the process of designing the anchor bolt length with double constraints is as follows: S21: Make the total length of the anchor bolt... satisfy ,in, This refers to the length of the anchor bolt's anchoring section that extends into the stable rock strata. This refers to the exposed length of the anchor bolt. S22: Ensure the safety factor of the surrounding rock at the end of the anchorage section. ,in The residual strength of the surrounding rock, The maximum principal stress is at the end of the anchorage section. To design a safety factor threshold; S23: First calculate the anchorage length of the anchor bolt based on conventional anchoring force and interfacial bond strength. Then calculate the length of the free section of the anchor bolt. ; S24: Calculate the depth at the end of the anchor bolt anchorage section .

5. The intelligent design method for support parameters of anchor bolt-anchor cable cooperative bearing according to claim 1, characterized in that, In S3, the process of spatial co-calculation of anchor cable length is as follows: S31: Calculate the thickness of the coordinated suspension. ; S32: First, construct the rock layer weighting coefficients based on the differences in the physical and mechanical properties of each rock layer. ,in The total number of rock strata within the coordinated suspension thickness range is determined; then, the equivalent suspension thickness is calculated based on the contribution of different rock strata to the anchor cable suspension load. ; S33: Calculate the length of the free segment of the anchor cable ,in For collaborative safety factor; S34: Calculation of anchorage length based on conventional anchoring force and interfacial bond strength Length of exposed section of anchor cable The value range is 0.1 to 0.3 m; S35: Calculate the total length of the anchor cable Furthermore, the anchoring section of the anchor cable is located in a deep, stable rock layer, forming a spatial collaborative solution relationship.

6. The intelligent design method for support parameters of anchor bolt-anchor cable cooperative bearing according to claim 1, characterized in that, In S4, the process for determining the stress disturbance coefficient is as follows: S41: Based on anchor bolt-anchor cable spacing Determine the stress disturbance coefficient ,like ,but ,in, The maximum interference coefficient; if ,but ; S42: Select four sections in the roadway with anchor bolt-anchor cable spacings of 0.8m, 1.0m, 1.2m, and 1.5m respectively. Install no less than 3 sets of force-measuring anchor bolts and force-measuring anchor cables in each section, and record the actual load on the anchor bolts under working conditions. and actual load of anchor cable ; S43: Calculate the stress disturbance level at each spacing. ; S44: Based on stress disturbance level right and Perform exponential fitting on the relationship and calibrate. value.

7. The intelligent design method for support parameters of anchor bolt-anchor cable cooperative bearing according to claim 1, characterized in that, In S5, the process of building and optimizing system synergy is as follows: S51: Construct a system synergy index that comprehensively reflects the utilization degree of anchor bolt and anchor cable material strength and the degree of stress interference, as shown in the following formula: ； In the formula, , Design preload for anchor bolts and anchor cables respectively. These are the effect weighting coefficients. This is the interference penalty coefficient; S52: Based on anchor bolt length Anchor cable length Anchor bolt-anchor cable spacing Anchor bolt preload Anchor cable preload As a design variable; The following constraints are established: the anchor bolt length satisfies geometric and mechanical constraints; the anchor cable length satisfies the spatial co-solution relationship; and the anchor bolt-anchor cable spacing... Anchor bolt preload Anchor cable preload ; S53: Employs a genetic algorithm with a population size of 80, a crossover rate of 0.8, a mutation probability of 0.05, a maximum number of generations of 300, and a fitness function based on the system's synergy index. Based on system coordination index With maximization as the optimization objective, and based on satisfying the constraints in S52, multi-constraint optimization is performed on the design variables to solve for the optimal parameter combination.

8. The intelligent design method for support parameters of anchor bolt-anchor cable cooperative bearing according to claim 1, characterized in that, In S6, the timing co-verification process is as follows: S61: The difference between the permissible elongation of the free section of the anchor cable and the permissible elongation of the free section of the anchor bolt is used as the design deformation grade difference. The formula for calculating the design deformation grade difference is as follows: ,in, , These are the ultimate elongation rates of anchor cables and anchor bolts, respectively. , These are the free section lengths of the anchor cable and anchor bolt, respectively. S62: with As a verification criterion, among them The preset allowance is used to determine the pressure margin. When the verification conditions are met, it indicates that the time-series coordination mode is formed. When the verification conditions are not met, the length of the free section of the anchor cable or the length of the free section of the anchor rod is adjusted first, or an anchor cable material with a higher elongation rate is selected. If the adjustment still fails to meet the requirements, the allowance threshold is lowered or the equal deformation coordination mode is used until the verification conditions are met.

9. The intelligent design method for support parameters of anchor bolt-anchor cable cooperative bearing according to claim 1, characterized in that, In S7, the process of on-site monitoring and dynamic verification is as follows: S71: Install multiple displacement gauges at different depths in the roof of the roadway. The depth of the measuring points should include at least the roof surface, the depth of the end of the free section of the anchor bolt, and the depth of the end of the free section of the anchor cable. S72: Continuously monitor and acquire the cumulative settlement at each measuring point, and calculate the measured deformation of the free section of the anchor bolt. Measured deformation of the free section of the anchor cable The measured deformation difference was obtained. ; S73: Calculate the relative error between the measured deformation grade difference and the design deformation grade difference. ,like If the anchor bolt-anchor cable cooperative bearing state deviates from the design target, then it is determined that the anchor bolt-anchor cable cooperative bearing state deviates from the design target. The tolerance threshold is set; parameter inversion is used for correction. If the tolerance is still not met after inversion, the length of the free section of the anchor cable and the length of the free section of the anchor bolt are adjusted, or anchor cable materials with higher elongation are selected, until... .

10. An intelligent design system for support parameters of anchor bolt-anchor cable cooperative bearing, used to implement the intelligent design method for support parameters of anchor bolt-anchor cable cooperative bearing as described in any one of claims 1 to 9, characterized in that, include: The geological parameter acquisition unit is used to automatically collect the geomechanical parameters of the surrounding rock of the tunnel and send them to the collaborative design unit; The monitoring data acquisition unit is used to collect the working status response of the roadway support structure in real time and send it to the dynamic verification and evolution unit. The collaborative design unit is used to obtain the geological conditions input by the unit based on the geological parameters, and automatically output the anchor bolt-anchor cable collaborative support parameter scheme to the visualization decision unit; The dynamic verification and evolution unit is used to dynamically verify the rationality of design parameters based on monitoring data. When the deviation between the measured response and the design expectation exceeds the limit, the parameter inversion is automatically triggered, and the corrected parameters are fed back to the collaborative design unit. The visualization decision-making unit is used to present design parameters, coordination indicators, stress interference distribution, and time-series verification curves in real time through a graphical interface, and to generate a standard support parameter design report.

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