Stress Mechanism And Application Analysis Of Micropiles

Geological disasters of landslide-prone, anti-slide pile when Landslide is acommon measure. In general, it is by increasing the cross-section of the pile toincrease the stiffness and strength of the pile, so resist the landslide thrust. Large pileswith a lot of problems in the actual construction, such as: steep landslide constructionsite of large construction machinery and equipment is not easy to play, but to greateruse of hand-dug way construction; earthwork volume, large construction disturbance,the provisional state landslide emergency slide has a great influence; construction oflow efficiency, high cost, poor security, and so on.As a new mini skid pile retaining structures, in Landslide in excellent anti-slidingeffect has been recognized by foreign researchers, and large-scale investment intopractical engineering applications, but for the domestic micro-piles research especiallyon micro-piles stress mechanism is far from enough. In this paper, theoreticalcalculation and simulation by means of the finite element method combined with avariety of micro-pile stress mechanism analysis, the following conclusions:①According to historical data of micro piles, engineering case studies, micropiles and piles of large anti-slide small compared with the weight of construction spacerequirements small, easy mechanized construction of the foundation bearing capacityrequirements low, short duration and other characteristics suitable for roadbed disasterslandslide rescue and emergency rescue works.②When laying micropiles, pile reasonable length from micro piles anchoringsection section section of rock anchoring bond coefficient, coefficient of sliding bodyor body deformation bonding experience joint decision, recommended value is3-5m.③Through numerical simulation analysis, theoretical calculation and comparisonwith others physical model test results obtained Micropiling more reasonable set ofthree rows, front loading withstand greater thrust back in descending order of12%, itshould be considered by increasing micro-piles the steel piles to reinforce the front orencryption.④Pile of soil micropiles of soil resistance of Extreme height from the ground2/3.⑤The use of finite element software PLAXIS Wentian Road Landslide simulatethe whole process, from the whole point of view, micro-piles as emergency rescue measures are effective, If it works as a permanent governance, its applicability to beverified, rescue deformation and instability in the performance of micro-piles forbending shear deformation. After the permanent implementation of the project, itsmain function is to assist the anti-slide pile anchor and stable landslide.