Stability analysis of cantilever double soldier-piled walls in sandy soil

Abstract

Cantilever double soldier-pile walls are used in vertical excavations to minimize wall deformation. A model is proposed consisting of an equivalent single soldier-pile wall with twice the bending stiffness of a single soldier-pile wall, twice the area of the pile shaft in contact with the soil below the excavation level, and the maximum capable mobilized moment at ground level, which can be used to evaluate the stability of double soldier-pile walls. A series of centrifuge model tests at an acceleration of 30 g was conducted to study the performance of cantilever single and double soldier-pile walls in sand under various test conditions. The test results show that the use of a double soldier pile can effectively improve the performance of retaining walls. The proposed stability analysis also provides satisfactory predictions of the factors of safety for double soldier-pile walls at various excavation depths and with various pile arrangements, verified by the results obtained in the centrifuge model tests. The use of F s ¼ 2.0 in the proposed stability analysis was found to be appropriate engineering practice for ensuring that the temporary cantilever double soldier-pile walls are stable and that the ratio hm /H does not exceed 1%.

Mobilizable Strength Design for Multibench Retained Excavation

“…where vol is the volume strain in part c. In (5), (8), and (11), the superimposed shear strains are related to the bench width and the distances between the soil zone and the toes of the 1RS and 2RS. For different geometry of multibench retaining system, the superimposed strain field and its shear strains are variable.…”

“…A typical two-bench retained excavation is shown in Figure 1. This retaining system consisted of two levels: doublerow [5] and single-row [6,7] contiguous pile walls were used as the first and second retaining structures, respectively.…”

Stability Analysis of Soldier-Piled Walls with Tied-Background Anchored

“…It is mainly use in stiff soil conditions where water infiltration into the excavated area is less or negligible. It having less costly and easily installed om the excavation site [1]. Generally, in the construction projects the retaining walls are used as temporary structures.…”

“…The stability of a wall of the excavation area is very important. However, if any excess ground settlement occurs behind the wall it can also leads to serious damage to nearby buildings [1,2]. Therefore, both stability and settlement is important during design of soldier pile around the excavations.…”

Performances and Working Mechanisms of Inclined Retaining Structures for Deep Excavations

“…Berm-supported diaphragm walls or piles [3], doublerow piles [4], and multibench retaining systems [5] are common braceless retaining structures that eliminate horizontal struts and ground anchors. However, berms occupy large areas when the excavation depth is relatively large and cause delays in the construction of underground structures in the berm areas.…”