The Finite Element Analysis Of Composite Soil Nail Wall

Soil Nail Wall Supporting Technology is a kind of technology which is economical, dependable, and easily constructed in reality. In modern times, the Soil Nail Wall Supporting Technology is commonly applied in construction. However, if there a strict requirement on the deformation of foundation ditch, the water level of the foundation ditch is relatively high or the soil horizon of the area in which the foundation ditch is located, the mere use of Soil Nail Wall Supporting Technology is not enough and can not reach the best effect. In order to overcome the disadvantages of the mere Soil Nail Wall Supporting Technology, the combinations of Soil Nail Wall Supporting Technology and other supporting constructions such as prestressing anchor arm, anchor rope, cement mixing method, superior mini-pile, etc are used. These types of combination are called Composite Soil Nail Wall Supporting Technology. According to the different situations of the area and soil horizon, Composite Soil Nail Wall Supporting Technology can make these flexible combinations freely. Because the present theory of Composite Soil Nail Wall Technology is not perfect and the research on it is not intensive enough, there are two phenomenons in the practical application of Composite Soil Nail Wall Technology:one is that in order to ensure the security and stabilization of foundation ditch supporting, designers are excessively conservative to increase the safety factor of foundation ditch by a wide margin and result in the waste of construction material and man-power; the other is that in order to save the cost, designers are overly radical to cause the excessive deformation of foundation ditch and instability and leads to the catastrophe failure. Based on the present research on the Composite Soil Nail Wall Technology, this thesis makes use of the analyzing software MIDAS/GTS to analyze the common combination of cement mixing method, prestressing anchor arm and Composite Soil Nail Wall Supporting Technology and compares the results with the monitoring results got in the actual project and then obtains the conclusions which can give some consulting value to the actual project. The conclusions are as follows:(1)Through the finite element analysis of the common combination of cement mixing method, prestressing anchor rope and Composite Soil Nail Wall Supporting Technology with the help of analyzing software MIDAS/GTS, the result is that the position of maximal horizontal displacement of mere Soil Nail Wall Supporting and Composite Soil Nail Wall Supporting is different, that is, it appears on the top of mere Soil Nail Wall while in the middle and bottom part of composite Soil Nail Wall.(2) For the axial force of prestressing anchor rope the intersection of anchoring section and free section has the strongest force and the remote end has the weakest one. The change of axial force is presented as a curve distribution. The axial force will be strengthened with the increase of the digging depth.(3) The overloading in the neighboring part of foundation ditch will enlarge the horizontal displacement and aggravate the land subsidence in the neighboring part of foundation ditch. Therefore, designers should pay attention to the overload in the neighboring part of foundation ditch and choose the proper value of overload in a serious attitude.