Composite Ladder Key Structure Optimization And Parameter Sensitivity Analysis

As a new kind of anti-slide structure,compound ladder-key structure has the advantages of large thrust resistance,small displacement of pile top,reasonable stress distribution of pile body,etc.The combined ladder structure makes the ladder key unit form pile group,And the size of the ladder key unit can be adjusted according to the different situation of the supporting slope body at different positions,so that the cooperative working ability between the ladder key units is improved,the structure type and the supporting performance of the anti-slide pile are optimized Good,and therefore gradually in large-scale landslide control by heavy.Based on the anti-slip mechanism,this paper further studies the optimization and parameter sensitivity of composite ladder-bond structure.In view of the structural optimization and parametric sensitivity analysis of composite ladder-bonding,the following work is mainly carried out:1: Establishment of anti-sliding mechanical model of compound ladder-key structureBased on the existing research results,the stress of the horseshoe-shaped cross-arm,the rectangular vertical leg,and the lateral locking key of the compound ladder-like structure under the action of earth pressure under the typical slope structure is studied.From the mutual effect of the pile-The stress mechanism of the horseshoe-shaped cross arm and the rectangular vertical leg and the movement form of the soil between the pile and the pile are analyzed emphatically.Finally,the superiority of the compound ladder structure is determined.2:The stress characteristics of the composite ladder bond structure are studied Composite ladder keys as statically indeterminate structure and space structure,the structure performance and working form significantly superior to ordinary anti-slide pile belongs to a statically determinate structure.Under the influence of the variable external load,the composite ladder structure can adjust the internal force of the structure itself,and make it suitable for complex and unpredictable load conditions.Composite ladder key structure has good working ability,the front and rear rectangular vertical legs in a joint resistance of landslide thrust at the same time,can by adjusting the structure geometry size,flexible allocation of front and back row pile and connecting beam load state and the biggest size and the distribution law of internal force,bending moment,shear force,the greatest degree of play to the performance of the composite structure.Through theoretical analysis and calculation,the deflection and bending moment formulas of the vertical legs in the front and back row are obtained.3: The numerical model of composite ladder structure anti-sliding was established,and the optimal scheme of structure size was analyzed and compared.Based on the finite difference method,the FLAC3 D is used to simulate the anti-sliding force process of the composite ladder-tie structure and its influencing factors,and the inherent anti-sliding mechanism is analyzed,focusing on the sheardeformation in the sliding zone,plastic zone,As well as the block of the whole displacement of the landslide body.The reinforcement effect of the anti-slide piles in the slope is analyzed by the numerical method under the typical slope structure,and the position of the rectangular vertical leg,horseshoe-shaped cross arm and transverse locking key in the anti-slide pile-Length,elastic modulus and other factors on the slope stability coefficient,the critical slip surface and the pile internal force,displacement response.The simulation results show that when the rectangular vertical leg is buried deep in the central region of the landslide,the anti-sliding economy is the most efficient.4: Establishment of geotechnical and structural parameters of the numerical simulation of sensitivity analysis.The pile-soil mechanics model was established and the reinforcement effect of the anti-slide piles in the slope was analyzed by numerical method.The effects of the friction angle and the cohesion in the anti-slide pile-slope system were discussed.Anti-skid properties.The numerical simulation results show that the structural modulus of elasticity is very small in the stability of the landslide,but it has a large effect on the internal force and displacement deformation of the structure itself.Composite rectangular vertical ladder key structure legs the increase of the section size,complex ladder key structure internal force value also gradually raised,but the structure of the displacement deformation gradually decreases,and the change of the horizontal displacement of rock and soil mass quantity also gradually to reduce,landslide appears to increase the security and stability of rock and soil mass coefficient remain unchanged after the trend.