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Two-surface progressive failure mechanism and stability quantitative evaluation of water-induced weakening retrogressive landslides: case study for clay landslides, China
https://orcid.org/0000-0001-8138-7937
Abstract This study investigates water-induced weakening retrogressive landslides and proposes a stability evaluation method based on the two-surface progressive failure mechanism. A new test device was designed to reproduce retrogressive landslides by injecting water into the sliding zone soil from bottom to top, and the inclination angles of trailing edge fracture surfaces and horizontal displacement were measured. Then, the calculated inclination angles were taken as slice types, which were combined with the shear stress‒shear displacement constitutive model and the shear displacement model of the sliding surface to characterize the stability change caused by deformation development of slopes and define the quantitative relationship between horizontal displacement and safety factor. The model test reproduces the progressive formation process of multistage sliding masses. Each sliding mass showed two failure surfaces, a bottom sliding surface and a trailing edge fracture surface. The inclination angles of the trailing edge fracture surfaces were 66 ~ 90°. Moreover, the relative errors between the theoretical and experimental inclinations were 1.33 ~ 9.09% for the model slope. For the actual landslide, the relative errors (SM3 ~ SM7) between the theoretical and actual inclinations were 1.45 ~ 10.94%, and the relative errors of SM1 and SM2 were larger because of large deformation, so the calculation of inclination angles was not suitable for slopes with large deformation. The relative error of the total displacement was 2.33%. These tiny differences suggest that the theoretical approach is applicable. This theoretical method can infer the stability of landslide through macroscopic deformation and drilling sampling.
Two-surface progressive failure mechanism and stability quantitative evaluation of water-induced weakening retrogressive landslides: case study for clay landslides, China
https://orcid.org/0000-0001-8138-7937
Abstract This study investigates water-induced weakening retrogressive landslides and proposes a stability evaluation method based on the two-surface progressive failure mechanism. A new test device was designed to reproduce retrogressive landslides by injecting water into the sliding zone soil from bottom to top, and the inclination angles of trailing edge fracture surfaces and horizontal displacement were measured. Then, the calculated inclination angles were taken as slice types, which were combined with the shear stress‒shear displacement constitutive model and the shear displacement model of the sliding surface to characterize the stability change caused by deformation development of slopes and define the quantitative relationship between horizontal displacement and safety factor. The model test reproduces the progressive formation process of multistage sliding masses. Each sliding mass showed two failure surfaces, a bottom sliding surface and a trailing edge fracture surface. The inclination angles of the trailing edge fracture surfaces were 66 ~ 90°. Moreover, the relative errors between the theoretical and experimental inclinations were 1.33 ~ 9.09% for the model slope. For the actual landslide, the relative errors (SM3 ~ SM7) between the theoretical and actual inclinations were 1.45 ~ 10.94%, and the relative errors of SM1 and SM2 were larger because of large deformation, so the calculation of inclination angles was not suitable for slopes with large deformation. The relative error of the total displacement was 2.33%. These tiny differences suggest that the theoretical approach is applicable. This theoretical method can infer the stability of landslide through macroscopic deformation and drilling sampling.
Two-surface progressive failure mechanism and stability quantitative evaluation of water-induced weakening retrogressive landslides: case study for clay landslides, China
https://orcid.org/0000-0001-8138-7937
Abstract This study investigates water-induced weakening retrogressive landslides and proposes a stability evaluation method based on the two-surface progressive failure mechanism. A new test device was designed to reproduce retrogressive landslides by injecting water into the sliding zone soil from bottom to top, and the inclination angles of trailing edge fracture surfaces and horizontal displacement were measured. Then, the calculated inclination angles were taken as slice types, which were combined with the shear stress‒shear displacement constitutive model and the shear displacement model of the sliding surface to characterize the stability change caused by deformation development of slopes and define the quantitative relationship between horizontal displacement and safety factor. The model test reproduces the progressive formation process of multistage sliding masses. Each sliding mass showed two failure surfaces, a bottom sliding surface and a trailing edge fracture surface. The inclination angles of the trailing edge fracture surfaces were 66 ~ 90°. Moreover, the relative errors between the theoretical and experimental inclinations were 1.33 ~ 9.09% for the model slope. For the actual landslide, the relative errors (SM3 ~ SM7) between the theoretical and actual inclinations were 1.45 ~ 10.94%, and the relative errors of SM1 and SM2 were larger because of large deformation, so the calculation of inclination angles was not suitable for slopes with large deformation. The relative error of the total displacement was 2.33%. These tiny differences suggest that the theoretical approach is applicable. This theoretical method can infer the stability of landslide through macroscopic deformation and drilling sampling.
Two-surface progressive failure mechanism and stability quantitative evaluation of water-induced weakening retrogressive landslides: case study for clay landslides, China
Sun, Lijuan (author) / Li, Chenjia (author) / Shen, Fangming (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
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