Abstract
In order to understand the deformation law and internal force distribution characteristics of the pile-anchor retaining structure in deep foundation pit engineering, the stress of the pile-anchor retaining system in the process of foundation pit excavation was tested by using the distributed optical fiber sensing technology of BOTDA. It uses the supporting pile cloth to set up the strain cable to collect the strain from the excavation process to the stability of the foundation pit, which analyzes the stress and internal force distribution. The results show that the overall deformation of the foundation pit is small and in a stable state. It uses the monitoring strain energy to truly reflect the distribution and transmission law of the pile internal force. It is shown that the bending moment is the maximum at the action position of the anchor cable on the pile anchor structure and 2.5m below the bottom of the pit. The design needs to reinforce the construction of such locations. At the same time, the distribution form of earth pressure calculated in reverse is different from the conventional one. When there are multiple rows of prestressed anchor cables, the earth pressure applied on the support is less than the calculated value of classical earth pressure theory. This pile anchor structure design theory and engineering application has reference value.
Highlights
Urban construction and all kinds of underground construction have developed rapidly in scale and quantity
When the structure is calculated, it often refers to the experience and selects a certain form to calculate the earth pressure, which will inevitably deviate from the actual situation of the project and affect the design
This paper considers the advantages of BOTDA distributed optical fiber sensing technology [2,3,4,5,6], such as high accuracy, long life, distribution, strong
Summary
Urban construction and all kinds of underground construction have developed rapidly in scale and quantity. Exploiting underground space has become a trend of urban development. There are many prevention and control methods for foundation pit, among which the pile-anchor retaining structure is widely used in foundation pit engineering due to its particularity. Its deformation control ability is strong and construction is more convenient. It can effectively solve the engineering problems such as deep foundation pit, high cantilever and strict deformation requirements. When the structure is calculated, it often refers to the experience and selects a certain form to calculate the earth pressure, which will inevitably deviate from the actual situation of the project and affect the design. This paper considers the advantages of BOTDA distributed optical fiber sensing technology [2,3,4,5,6], such as high accuracy, long life, distribution, strong
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