| Mianyang city is located in the transition zone from longmen mountain to sichuan basin.It belongs to the northern part of basin central hilly area of sichuan basin.Landform belongs to the landform of middle and low mountain formed by tectonic denudation,which is mainly controlled by complex geological structure,tectonic movement and geological action of external forces.The bedrock in this area is mostly silty mudstone.Because silty mudstone contains more soluble substances,less permeability and more water,it is relatively soft and soft.In recent years,the national road construction in mianyang mountain area involves more problems about slope support.As one of the slope treatment schemes,pile wall is widely used because of its obvious treatment effect.As a key parameter in pile wall design,the horizontal resistance coefficient K directly affects the calculation of internal force and displacement of the pile in the fixed section.K value at present is mainly according to the specification or experience to determine,empirical data are based on flat field single pile static load test is the accumulation of data,and is used in the design of Zhuang Ban Qiang directly,and does not take into account the venue is tilted case the change of the equivalent values of K,therefore,Zhuang Ban Qiang have improved the security and economy of space.In this paper,taking the slope treatment project of zhongyan highway K51 + 200 as an example,the variation rule of the proportional coefficient of horizontal resistance of silty mudstone under different slope conditions is analyzed.Using ABAQUS finite element software to simulate,positive software to carry out displacement inverse calculation,get the law of the change of the equivalent K value with the slope,and then apply the law to the actual engineering,according to the law to determine the equivalent K value in line with the actual engineering,use the value to design the pile wall,and combined with the field monitoring data to verify its rationality.The following work is carried out for the study of the equivalent K value of this project:(1)according to the geological conditions of zhongyan highway K51 + 200 slope treatment project,the research site and engineering situation of the equivalent K value are briefly introduced;(2)by using numerical simulation software of ABAQUS,the principle is geotechnical software conforms to the actual engineering model is set up,mainly through changing parameters such as pile top rock mass slope,pile length on the top of the pile embedded segment of the ground before the horizontal displacement,horizontal displacement of pile head,pile horizontal stress,rock mass equivalent values of K were analyzed,and the obtained equivalent K values of slope,pile length change rule;(3)the obtained law is applied to the actual engineering,the equivalent K value in the actual engineering is determined according to the law,the value is used for the design of pile plate wall,at the same time,the 1/2 practical model is established,and the displacement of pile top is analyzed and discussed;(4)the horizontal displacement of pile top is monitored for pile plate wall,and the monitoring value is compared with the numerical simulation value.The pile wall designed with the equivalent K value has obtained good results and economic benefits in the slope treatment project of zhongyan highway K51 + 200,which can provide reasonable reference for similar projects in the future. |
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