| As an important part of national transportation,air transport has long been the economic benefits and convenience for the country and the people.Civil airport has played an indispensable role in air transportation.Along with China’s large-scale construction of the airport,the airport’s location often had to choose in more complex terrain area due to land conservation etc,such as mountainous,hilly region.Artificial digging and filling modification is the basis of the work will be carried out.These areas due to natural terrain reason itself may be accompanied by a similar landslide geological disasters,the stability of the soil will certainly being affected especially with impact of the construction renovation.So it shows the need for analysis of slope instability and strengthening the unstable slope.The reinforced retaining wall was often used as reinforcement structure in high embankment slope,the parameters of reinforced soil structures is keeping changing accompanied with the construction.Many variations of the parameters have important impact on the structural stability and construction quality.Simulation of the construction process can achieve analysis in details at all stages on the relevant parameters of construction and find some rules in the process more easily,so we can achieve the purpose of guiding the course of construction.In this thesis,author has carried out landslide stability analysis and construction process simulation on geotextile reinforced retaining wall of an airport in Gansu through PLAXIS.First,horizontal displacement and the safety coefficient of reinforced retaining wall under several different conditions were analyzed,then the ribbon spacing and a ribbon arrangement for the effect on the stability of the structure was studied,finally,horizontal displacement,axial force and safety coefficient of the construction process were analyzed.The main conclusions are as follows,(1)The safety coefficient change law of the embankment reinforcement slope is different from law of full embankment slope.The former one’s safety coefficient is increasing at first and then decrease with growth of embankment height.(2)In the project,common full-height fabric reinforcement is not used on the new fill soil formation gentle slope,only at the lower part of the slope reinforcement. Not only to achieve a predetermined safety coefficient,but also to meet the requirements of thestability and saving of reinforcement.(3) Shear strength parameters of soil have a greater effect on the implementation of reinforced reinforcement.Soil shear strength parameters higher, the better the stability is,the same soil horizontal displacement of the soil become more evenly.(4) Through the course of construction and reinforcement horizontal displacement axial force analysis conclusion,axial forces of reinforced retaining wall near the outside retaining wall is relatively large,gradually decreases toward the inside wall. When undisturbed soil slopes fill reinforced reinforcement, regional horizontal displacement of slope moves away from undisturbed soil to the outer area. |
