Study on Dynamic Response of Pressure Type Anchor and Lattice Beam System Under Seismic Loadings
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ORIGINAL PAPER
Study on Dynamic Response of Pressure Type Anchor and Lattice Beam System Under Seismic Loadings Xiaofeng Lei . Banqiao Wang
. Nan Li . Jianbin Hao
Received: 4 April 2019 / Accepted: 9 June 2020 Ó Springer Nature Switzerland AG 2020
Abstract In order to investigate dynamic response of anchoring landslide under seismic loadings with different loading magnitudes, a large scale shaking table model test was carried out, and the acceleration response of anchoring landslide, mechanical characteristics of anchors and lattice beams were studied respectively. The test results indicate that (1) under lower loading magnitude 0.05–0.2 g, the PGA amplification factors of different soil layers in landslide, and the dynamic response in different layers of anchors and lattice beams all have little differences. (2) Under 0.2–0.4 g, the PGA amplification factors of different soil layers and the anchoring force of different layers of anchors continue to increase. The strain of the top anchors and the bending strains of the top crossbeams are slightly greater than that in other layers. (3) Under high loading magnitude 0.4–0.6 g, the strain of the upper anchors continues to increase and it is much greater than that in other layers, and the bending strain of the top crossbeam increases sharply and generates obvious tension-bend deformation.
X. Lei Xi’an Highway Institute, Xi’an 710065, Shaanxi, China B. Wang (&) N. Li J. Hao School of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, Shaanxi, China e-mail: [email protected]
Keywords Anchoring landslide Shaking table Anchor and lattice beam Dynamic response process
1 Introduction Engineering practices show that anchor and lattice beam structure is an effective supporting method. The anchoring structure not only has significant role in anti-sliding, but also has obvious advantages in antiseismic (Tannant et al. 1995; Shukla and Hossain 2011). The survey findings of Wenchuan Earthquake, Tangshan Earthquake and Hanshin-Awaji Earthquake in Japan showed that the anchoring engineering was still effective after the earthquake, and there was no obvious geological disasters occurred (Guan 2009; Zhou et al. 2010; Ren et al. 2016). Therefore, it is particularly important to fully understand the seismic response characteristics of the anchoring landslide and the mechanism of the anchor and lattice beam system for aseimic design in high-intensity areas. Currently, many scholars have studied the anchoring landslide based on numerical simulation, shaking table test and other methods, and have made some desirable research results. Such as, Ota et al. (2010) performed centrifuge model tests and examined the characteristics of dynamic and residual loads on anchors that installed in slopes subjected to seismic loads. Shukla and Hossain (2011) analyzed the safety
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factor of rock slopes supported by anchors with different orientations subjected to surcharge and seismic loads. Qi et al.
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