Physical model test on landslide reinforcement mechanism and embedded length of combined stabilizing piles with circular cross-section
At present,large-section hand-dug piles have been restricted in some industries due to high con-struction risk and low efficiency.It has become a new trend to carry out study on combined piles with circu-lar cross-section that can be mechanized.However,current research on the deformation,force characteris-tics and embedded length of combined piles with circular cross-section is not sufficient.Thus,based on a self-designed landslide-pile testing system,a series of cases of landslide-pile physical model tests were per-formed,deformation evolution process of the sliding mass was analyzed,and the deformation,force charac-teristics of the sliding mass were studied.Moreover,the impacts of different embedded lengths and cross-beams on the deformation characteristics of the combined piles with circular cross-section were analyzed,and the landslide reinforcement mechanism of combind stabilizing piles with cross-section was revealed.The main results are as follows:① The evolution of the sliding mass can be classified into four stages:com-pacted,uniform deformation,accelerated deformation,and failure stages;② There are inverted bending points where the bending direction of piles changes in the fore and rear piles;the inverted bending points moved toward the pile head,and those of rear piles are closer to the slip surface;③ The reasonable embed-ded length of the fore or rear piles is determined by comparing the results of different model tests;the em-bedded length of a row pile remains unchanged,and 36％of the pile length can be considered as a reasona-ble embedded length of another row pile whose embedded length is changed;④ Compared with the case without the crossbeams,the maximum displacement of rear piles is reduced by 15.6％,with little effect on fore piles;⑤ The crossbeams reduce the maximum bending moment near the slip surface,which makes the bending moment of the pile body more reasonable.This study may provide a basis for the derivation of the-oretical methods,and in turn guide the engineering design practice.
stabilization of landslidecombined pile with circular cross-sectionreinforcement mechanismembedded lengthphysical model test
万方数据
维普
