Abstract
For c-φ soil formation (cohesive soil) of limited width with ground surface overload behind a deep retaining structure, a modified active earth pressure calculation model is established in this study. And three key issues are addressed through improved soil arching effect. First, the soil-wall interaction mechanism is determined by considering the soil arching effect. The slip surface of a limited soil is proved to be a double-fold line passing through the retaining wall toe and intersecting the side wall of the existing underground structure until it reaches the ground surface along the existing side wall. Second, the limited width boundary is explicated. And third, the variation in the active earth pressure from parameters of limited c-φ soil is determined. The lateral active earth pressure coefficient is nonlinear distributed based on the improved soil arching effect of the symmetric catenary curve. Furthermore, the active earth pressure distribution, the tension crack at the top of the retaining wall and the resultant force and its action point were obtained. By comparing with the existing analytical methods, such as the Rankine method, it demonstrates that the model proposed in this study is much closer to the measured and numerical results. Ignoring the influence of soil cohesion and the limited width will exponentially reduce the overall stability of the retaining structure and increase the risk of accidents.
Highlights
A double-fold line slip surface that considers the soil internal friction angle and the soil-wall friction angle was determined to be suitable for calculating the active earth pressure of a limited c-φ soil, and a symmetrical catenary arching curve was proposed to simulate the minor principal stress trajectory of a horizontal soil strip
An active earth pressure calculation model for a limited c-φ soil that considers ground surface overload was proposed based on the limit equilibrium method of a horizontal soil strip and the
An active earth pressure calculation model for a limited c-φ soil that considers ground surface overload was proposed based on the limit equilibrium method of a horizontal soil strip and the improved soil arching effect theory
Summary
As the development of construction technology and density of the underground environment, the surrounding soil behind a deep retaining wall is often constrained by many underground structures. The stress and strain of the limited soil are significantly different from those of a semi-infinite soil [1,2,3,4]. In this case, a reasonable soil of limited width between the newly constructed deep retaining
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