Seismic precursor to instability induced by internal erosion in loose granular slopes

Abstract

Fluidised landslides are one of the most dangerous types of mass movements as they can run over long distances at high velocity. A flow-like landslide can occur in both artificially designed and natural slopes, resulting in extensive property damage and significant loss of life. Although various studies have examined the initiation mechanism of this type of landslide, the understanding of the phenomenon of instability which can occur in loose granular slopes deserves further attention. Specific influential factors, such as the changes in the soil microstructure due to water infiltration and seepage forces, still need to be further examined. In this study, the initiation of a fluidised landslide is investigated through flume tests. The tested material was collected from a coseismic landslide deposit in the 2008 Wenchuan earthquake area. These loose, granular deposits can fail due to intense rainfall and exhibit flow-like movement, potentially evolving into destructive debris flows. Two flume apparatuses have been used, which were equipped with multiple sensors to evaluate the pore pressures and the internal displacements. A high-sensitivity seismic accelerometer was installed at the bottom of the flume to record the vibrations produced by the movement of the soil particles during the tests. The soil mass was progressively wetted either by a uniform inflow from the ground surface at the top of the slope, to simulate the infiltration of run-off water arriving from upslope, or by a gradual rise of the water level at the upper boundary of the slope, to simulate a gradual rise of the groundwater table. Internal erosion of the finer soil fraction driven by the seepage forces is thought to have played a significant role in the slope collapse. Possible changes in the particle arrangement were recorded by the accelerometers in the form of an increasing high-frequency vibration signal before any significant rise of pore pressure and any significant displacement of the slope could be observed. Although further parametric investigation is still necessary, and tests at real scale should be devised, the observed behaviour suggests that seismic monitoring of loose, granular deposits could be a promising method for detecting an incipient slope collapse.

Internal Erosion Controls Failure and Runout of Loose Granular Deposits: Evidence From Flume Tests and Implications for Postseismic Slope Healing

“…Additional tests with different proportions of small particles and different hydraulic boundaries are reported in Figures S5-S7 (supporting information, replotted from Hu et al, 2018). Further tests were performed using a flume apparatus with different slope inclination and geometry ( Figure S8), to exclude the effect of the latter on the observed processes (replotted from Hu et al, 2017).…”

Three‐dimensional hydromechanical modeling of internal erosion in dike‐on‐foundation

“…Moreover, sinkholes and cavities triggered by internal erosion are frequently observed within dams and dikes . Internal erosion can also trigger slope failures and generate significant landslides …”

“…However, these studies have not provided a clear understanding of where and when seepage flow could trigger internal instability in a granular soil mixture at larger space scales for real boundary value problems. Several physical tests have been carried out for this purpose . However, few numerical studies at the scale of an engineering structure are available in the literature .…”

Relating fragmentation, plastic work and critical state in crushable rock clasts

“…Grain breakage is a fundamental issue for the stability of earth dams, embankments and railway ballasts, and for the bearing capacity of piles (e.g., Daouadji et al, 2011;Okonta, 2015;Winter et al, 2017). Quantitative information about the shearing history can be retrieved from glacial sediments (Altuhafi and Baudet, 2011) and landslide granular deposits (Zhang and McSaveney, 2017), and can be crucial for understanding the likelihood of the latter to exhibit further instability (Hu et al 2017(Hu et al , 2018a(Hu et al , 2018b(Hu et al , 2018cFan et al, 2018). Extensive fragmentation has been also related to frictional weakening in rock avalanches, although the issue is still debated (Davies et al, 1999;Fan et al, 2017;Scaringi et al, 2017Scaringi et al, , 2018Ren et al, 2018) and further, dedicated experimental investigations are required.…”