The Research Of Reinforcement Result And Stability About The Micro-pile Group Consolidate Embankment Slope

Micro-pile is a kind of small diameter bored pile, which diameter ranges from10cm to30cm and its length to diameter ratio is generally greater than30. Micro-pile is composed of reinforcement material and cement mortar or small stone concrete which are grouted by pressure. According to the different application, the reinforcement material of micro-pile can be steel, steel pipe or other shape steel.Micro-pile has the advantage of economic, environmental protection and rapid, the reason why it gets more and more wildly applied in slope treatment engineer, but the study of the theory of the micro-pile and its widespread application has obvious gap. In this paper, it mainly does the following research based on the Yugu K.63slope treatment engineer.(l)Using the residual thrust method for four typical sliding surface of the K63slope to determine the prime sliding surface, using the numerical simulation analysis by the MIDAS/GTS for four typical sliding surface of the K63slope to determine the prime sliding surface;(2) In order to analyze the stability of the slope, it is used MIDAS/GTS software, analyzing slope stability under different working conditions, such as natural, storm, earthquake, storm+earthquake; analyzing bending moment, axial force and horizontal displacement of micro-pile under the numerical simulation of the natural conditions;(3)Using asymmetrical static load simulates driving load, it would analyze the stability of the prime sliding surface and the displacement, bending moment, shear force and axial force of micro-pile under the25-25kN,25-160kN of two kinds of working condition;(4) In slope treatment engineering process and after the completion, it would monitor the stability of slope for a year. The monitoring data of slope is the displacement and stress of micro-pile and r the change of underground water level and the deformation situation of slope. It could be better understood the role of micro-pile in managing slope through the monitoring data and further study the ratio of soil’s stress and micro-piles’stress;(5)The following conclusion:1) Micro-pile has more construction advantages and stronger ability against sliding;2) The stability of subgrade is greatly increased after reinforcement of micro-pile. It can remain stable under the combination of adverse work condition;3) Under the contact beam, the approximation of the micro-piles’ horizontal displacement shows that the micro-piles’ integral anti-sliding pile group effect is good;4)Micro-pile makes surrounding soil be a part of anti-sliding;5) asymmetrical traffic load increase roadbed slope of migration;6) By comparison the earth pressure of soil between piles, draw a conclusion the ratio of earth pressure on the mountain is0.8:1.3:landon the river side is2:3:1;7) The ratio of thrust among micro-piles is7.12:1.75:1;8) Micro-pile is not suitable for governance of large landslides.