Study And Application Of The High-rise Building Foundation Design On Finite Thickness Of The Soil

Foundation bearing capacity of foundation in fact contains both the strength and content of settlement. Foundation soil strength is the strength of limit damage, to ensure that no damage occurred foundation, foundation strength sufficient safety margin. Therefore, the definition of intensity from the foundation bearing capacity is the ultimate bearing capacity divided by some safety factor, safety factor is usually 2 to 3. From the settlement area is required due to settlement of the foundation does not affect the use of the upper structure, generally based on standard control the total settlement and differential settlement.Usually based on high-rise building design, especially design of raft foundation, face bearing stratum (layer) thickness is generally limited thickness of the layer, and sometimes its thickness is 2 to 4 meters, the underlying layer for the bearing capacity of more high rock, the foundation bearing capacity of such people is usually provided by the geological report of the design capacity of the bearing layer, and less consideration of its thickness. In fact, when the support layer of thin, its actual capacity is greater than thick foundation layer of the circumstances bearing on this case, the foundation bearing capacity values need further research.In this paper, geological conditions of a plot of high-rise building under the basic design, on the basis of the next raft holding Li layer finite thickness of the bearing capacity of the Yanjiu to determine the bearing capacity Heli's Lilun basis to provide better, while for the same You reference works.The finite element method, considering soil ductile failure, calculated raft not limited in the thickness of the bearing layer under the bearing capacity. First support layer for the single layer case, the formula used Terzaghi bearing capacity theory is verified by finite element method calculation of the accuracy and reliability of the bearing capacity, then the finite element method for different bearing layer thickness calculate the actual situation based on the relationship between load and settlement PS curve, determine the bearing capacity under the PS curve, the basis of specific dimensions, draw the actual foundation bearing capacity and strength of the relationship between the thickness of the bearing layer. Theoretical proof of holding force when the thickness of the bearing capacity of finite thickness than the single layer of soil bearing capacity should be large, so as to engineering design of safe, reliable and rational design provides theoretical support for similar projects can also provide meaningful reference. At the same time that used in this project is feasible and safe bearing capacity. Meanwhile, the paper also the basis for the settlement of the projects using a variety of methods of calculation, the results show that the results many ways close to settlement to meet the upper structure, and further that the limited strength of the bearing layer under the foundation bearing capacity of reliability.