Seismic behavior of a single-form lattice anchoring structure and a combined retaining structure supporting soil slope: a comparison

Lin, You‐Yu; Li, Lu; Guolin, Yang

doi:10.1007/s12665-020-8817-8

Cited by 17 publications

(7 citation statements)

References 54 publications

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“…Underreamed ground anchors, such as multiple underreamed anchors, are usually applied in soft fine-grained soil or clay to improve uplift capacity 3 . Shear resistance inside the soil, transferring through the soil–structure surface, makes up the anchorage bearing capacity, and this capacity is an important index used to evaluate the anchorage effect 4 . For underreamed anchors, the end bearing resistance on the “shoulder” of the anchor can enhance the uplift load more efficiently.…”

Section: Introductionmentioning

confidence: 99%

Structural parameter variation working on the performance of anti-uplift multibell underreamed anchors

Chen

Xia

Lin

et al. 2022

Sci Rep

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The structural parameters of multibell underreamed anchors play a crucial role in anchoring performance. The parameters of multibell underreamed anchor investigations are helpful when exploring optimized anchor structures. Based on the results of small-scale physical modelling tests, two types of multibell underreamed anchors were adopted under vertical uplifting loads. Numerical investigations were employed to study the effect of bell spacing, underream structure and bell dimension on the ultimate uplift bearing capacity. After an analysis of the anchorage mechanism, the anchoring efficiency was evaluated by the anchoring force provided by the unit concrete usage of the anchor, and the structural parameter λ equal to the surface area ratios of the expanded bell cone to the straight shaft between bells was defined. Then, the anchoring efficiency optimized structural parameters were presented. An analysis of model tests and simulation results showed that compared to concave bell surfaces, the convex shape could enhance the ultimate bearing capacity of a multibell underreamed anchor. There is an optimal value for the spacing of neighbouring bells, and there are three models of mechanisms for multibell anchors pulling out. When λ ∈ [1, 1.8], the multibell anchors can perform most efficiently to achieve their structural advantages.

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Section: Introductionmentioning

confidence: 99%

Structural parameter variation working on the performance of anti-uplift multibell underreamed anchors

Chen

Xia

Lin

et al. 2022

Sci Rep

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“…In the current process of geotechnical prestressed bolt support engineering, the corrosion of the bolt can be roughly divided into three stages, namely the passivation period stage, the incubation period stage, and the corrosion acceleration stage. Generally, the first two stages take a long time, depending on the alkalinity reduction degree of the protective layer on the bolt and the depth and concentration of harmful ions [20,21]. Improving the thickness and compactness of the protective layer of the anchor rod is conducive to prolonging the durationof these two stages.…”

Section: Discussionmentioning

confidence: 99%

Stress Loss Analysis of a Geotechnical Prestressed Anchor under a Corrosive Environment in a Coastal Area

Liu

Chen

2022

Coatings

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The corrosion of geotechnical prestressed anchor rods directly affects the safety of anchor structure engineering. To this end, an experimental device for measuring the stress loss of an anchor structure was developed, which was used to study the stress loss of a prestressed anchor structure under a corrosive environment, obtain the stress change curve of the anchor structure, and analyze the influence of a corrosive environment on the stress loss of a prestressed anchor structure in coastal areas. The final experimental results show that the degree of stress damage to bolts was determined by the cross effect of the environment and stress, and most of the stress damage occurred in the early stage after loading. The stress loss of the anchor structure resulted mainly from the bond degradation of the anchor section, and partly from the degradation of the elastic modulus of the rod body. Corrosion reduced the bonding force and bolt strength of the bolt–grouting body, and the influence of corrosion on the degradation of bonding strength of the bolt–grouting body was greater than that on the degradation of bolt strength. The maximum degree of axial stress corrosion influence on the rock–soil anchor was 11.6%. When the oxygen concentration was higher, the corrosion rate was greater. Therefore, accelerated corrosion indirectly increases the stress loss of anchor bolts.

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“…Numerical simulation is an effective way to investigate the interaction mechanisms of soil and reinforcement. Numerical simulation can well extend the interface friction mechanics of the soil and tensile reinforcement which cannot be observed and measured directly by tests [ 22 , 23 , 24 ]. Many scholars visualized the load transfer behavior between geogrids and soils in a particle-based view by PFC, providing more insight into the behavior of the interface between geogrids and soils at the microscopic scale [ 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Interface Mechanics of Double-Twisted Hexagonal Gabion Mesh with Coarse-Grained Filler Based on Pullout Test

Gao,

Lin,

Wang

et al. 2023

Materials

Self Cite

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The interface friction mechanics of reinforcement material with filler is an essential issue for the engineering design of reinforced soil structure. The interface friction mechanics is closely associated with the properties of filler and reinforcement material, which subsequently affects the overall stability. In order to investigate the interface mechanism of a double-twisted hexagonal gabion mesh with a coarse-grained filler derived from a weathered red sandstone, a large laboratory pullout test was carried out. The pullout force–displacement curve was obtained by fully mobilizing the gabion mesh to reach the peak shear stress at the interface between the gabion mesh and the coarse-grained filler. The change of force–displacement characteristics and the distribution of tensile stress in gabion mesh during the pullout process were obtained. A 3D numerical model was established based on the pullout test model, and the model for analyzing the interface characteristic between the gabion mesh and the coarse-grained filler was modeled using the FLAC3D 6.0 platform. The interface characteristics were further analyzed in terms of the displacement of soil, the displacement of reinforcement, and the shear stress of soil. The strength and deformation behaviors of the interface during the entire pullout process were well captured. The pullout force–displacement curve experiences a rapid growth stage, a development transition stage and a yielding stabilization stage. The critical displacement corresponding to peak pullout stress increases with the increase in normal stress. The normal stress determines the magnitude of shear stress at the reinforcement and soil interface, and the displacement distribution of a gabion mesh is not significantly affected by normal stress when the applied normal stress is within a range of 7–20 kPa. The findings are beneficial to engineering design and application of a gabion mesh-reinforced soil structure.

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Seismic behavior of a single-form lattice anchoring structure and a combined retaining structure supporting soil slope: a comparison

Cited by 17 publications

References 54 publications

Structural parameter variation working on the performance of anti-uplift multibell underreamed anchors

Structural parameter variation working on the performance of anti-uplift multibell underreamed anchors

Stress Loss Analysis of a Geotechnical Prestressed Anchor under a Corrosive Environment in a Coastal Area

Interface Mechanics of Double-Twisted Hexagonal Gabion Mesh with Coarse-Grained Filler Based on Pullout Test

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