Experimental study of displacement field of layered soils surrounding laterally loaded pile based on transparent soil

Yuan, Bingxiang; Li, Zihao; Zhao, Zuqing; Hóng, Ní; Su, Zhilei; Li, Zhijie

doi:10.1007/s11368-021-03004-y

Cited by 143 publications

(46 citation statements)

References 25 publications

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“…Physical test and numerical analysis are widely used in geotechnical engineering [16][17][18][19][20][21]. In this paper, the topography and mountain trend of the Batang section of the Jinshajiang main fault are studied, with emphasis on the outcrops of natural rocks in the area.…”

Section: Methodsmentioning

confidence: 99%

Multilevel Structural Characteristics of Jinshajiang Main Fault and Its Influence on Engineering

Zhou

Shen

Yong

et al. 2022

Advances in Materials Science and Engineering

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It is of great significance to study the geological characteristics of faults and the corresponding displacement patterns for the tunnel engineering crossing active faults. On the basis of field investigation and geological data analysis, it is found that the secondary weak structures, such as narrow cleavage bands, narrow joint bands, fault gouge zones, and small folds, often appear in the fault fracture zones and affected zones. The multilevel structure of fault is proposed from mechanics and engineering by summarizing their main characteristics. Taking the outcrop of fracture zones of Batang section, Jinshajiang main fault in the Qinghai-Tibet Plateau as the research object, the geometric characteristics of rock masses, the particle size, mineral composition, and mechanical characteristics of rocks in the fault are studied through field investigation, geological mapping, mineral composition analysis, and mechanical tests. In addition, a displacement model of multilevel structure fault is presented by numerical simulation. The results show that the Jinshajiang main fault comprises a primary structure and several secondary weak structures, which has a typical structure of multilevel fault. There are several secondary weak structures in the outcrop of the fracture zone. Compared with the rock masses in the primary structure, the joints of the rock masses in the secondary weak structure are more developed, and the rock particle size is smaller, the mud content is higher, and the mechanical strength is lower. The geometric morphology, mineral composition, and mechanical properties of the rock masses in the secondary weak structure are obviously different from those of the primary structure. The overall displacement mode of multilevel structural fault is S-shaped distribution, and the secondary weak structure will affect the displacement distribution pattern and have the possibility of sliding when the fault moves. Therefore, the secondary weak structure section in the tunnel should be a priority for prevention and control when designing tunnels through active faults. The multilevel structure of the fault, together with centralized structure, distributed structure, and stepped structure of the fault, can be used as a structure classification method of fault structure, which provides a reference for the study of disaster mechanisms, and prevention and control measures of tunnels crossing active faults.

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Section: Methodsmentioning

confidence: 99%

Multilevel Structural Characteristics of Jinshajiang Main Fault and Its Influence on Engineering

Zhou

Shen

Yong

et al. 2022

Advances in Materials Science and Engineering

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“…It should be noted that the purpose of the test in working condition 2 is to analyze the deformation law of the model in the saturated state of the top filling body and the middle layer of the original Malan loess. Although the submerged caves are unevenly distributed and anisotropic in the actual project (Liu et al, 2020b;Yuan et al, 2021;Yuan et al, 2022;Zhou et al, 2022), in the process of model making, it is impossible to make caves according to the actual shape of the cave. In addition, water immersion in the cave in the experimental model is only a simulation of the immersion path of the prototype, and it is not necessary to make the cave according to its actual shape.…”

Section: Working Condition 2: High Slope Stability Test Under Saturat...mentioning

confidence: 99%

Study on Deformation Characteristics of Loess Ultrahigh-Fill Slope Based on Large-Scale Undisturbed Soil Centrifugal Model Tests

Mei

Zhou

et al. 2022

Front. Earth Sci.

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Taking the loess high-fill project of Lv Liang airport in China as the research object, large-scale centrifugal tests were carried out to investigate the deformation characteristics of the collapsible loess ultrahigh-fill slope under natural moisture content and saturated state by using a joint model of undisturbed loess and remolded loess. The results show that the consolidation deformation of the collapsible loess ultrahigh-fill slope is the main factor causing its deformation. The post-construction deformation amount and deformation rate are large in the early stage, and the relationship between the post-construction deformation and thickness of filling body is linear. When the water content of soil increases due to infiltration, the consolidation of the filling body and the collapse of the undisturbed foundation loess will cause settlement and deformation of the slope. The slope may crack along the soft zone formed when the water infiltrates. When failure occurs, the sliding surface will pass through the collapsible soil layer. The contact surface between the collapsible loess layer and the adjacent soil layer is part of the sliding surface, and the contact surface with a relatively low strength will be damaged first. When the strength difference between adjacent soil layers is large, the upper soil layer on the slip surface shows a typical translational sliding mode. The slip surface is approximately arc-shaped, and there is a transition layer with a specific thickness between the slip surface and contact surface. The water content of the high-fill slope has a great influence on the post-construction settlement of the slope crest and slope stability. The post-construction settlement of the slope crest increases with the increase in the water content of the filling body, and the stability coefficient of the slope decreases with the increase in the water content of the filling body. In the saturated state, the sliding force of soil increases, the shear strength decreases, and the stability of high fill slope decreases. Therefore, it is necessary to strengthen the inspection of the rationality of drainage system design in slope construction to ensure slope safety.

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“…At macroscale level, the shear band is the significant characterization of the slope slip [32][33][34]. Correspondingly, the analysis of particle displacement field of discrete domain, at microscale level, can improve the understanding of the movement of granular materials and allow better judgment in relation to the trends associated with displacements [35]. Figure 9 shows the development process of the shear band after slope excavation.…”

Section: Correlation Analysis Of Shear Strain Increment Andmentioning

confidence: 99%

The Instability of High-Steep Road Cutting Slope: A 3D Continuum-Discrete Coupling Method

et al. 2022

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In this paper, the 3D continuum-discrete coupling analysis method combined with the strength reduction theory is used to study the macrodeformation, stress law, and microfracture mechanism of a high and steep cutting slope of Zhongkai Expressway in Guangdong Province. The 3D continuum-discrete coupling slope model is established based on the finite difference software FLAC and the discrete element program PFC. Then, based on the correlations between stress tensor and force chain, displacement and shear strain increment, plastic deformation, and microfracture, the mechanism of slope instability is analyzed from macro- and microscales. The research shows the following: (1) the continuum-discrete coupling model is reasonable and effective in the three-dimensional slope stability analysis. (2) The coupling domain was penetrated by the shear band, and the upper part displacement of the coupling domain was large, whose direction was basically consistent with the shear band direction; thus, the slope slip surface was formed. (3) The microfracture can represent the macroscopic failure phenomenon, and the slope landslide can be interpreted as the result of shear fracture in slip direction, accompanied by the extension and penetration of tension crack.

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Experimental study of displacement field of layered soils surrounding laterally loaded pile based on transparent soil

Cited by 143 publications

References 25 publications

Multilevel Structural Characteristics of Jinshajiang Main Fault and Its Influence on Engineering

Multilevel Structural Characteristics of Jinshajiang Main Fault and Its Influence on Engineering

Study on Deformation Characteristics of Loess Ultrahigh-Fill Slope Based on Large-Scale Undisturbed Soil Centrifugal Model Tests

The Instability of High-Steep Road Cutting Slope: A 3D Continuum-Discrete Coupling Method

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