Siqing Qin
Chinese Academy of Sciences
GeologyMathematical analysisBrittlenessPhase transitionCreepNonlinear systemWeibull distributionLandslideGeotechnical engineeringLyapunov exponentMaterials scienceMyloniteMineralogyShape parameterConstitutive equationInstabilityGeometryMetamorphic rockChaoticStiffnessBifurcationCatastrophe theoryIgneous rockSlip (materials science)MechanicsStrain (chemistry)Control theoryRenormalization groupCrack closureRockslideStress (mechanics)
17Publications
13H-index
426Citations
Publications 17
Newest
#1Baicun Yang (NU: Northeastern University)
#2Siqing Qin (CAS: Chinese Academy of Sciences)H-Index: 13
Last. Hong-Ran Chen (CAS: Chinese Academy of Sciences)H-Index: 2
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#1Hong-Ran Chen (CAS: Chinese Academy of Sciences)H-Index: 2
#2Siqing Qin (CAS: Chinese Academy of Sciences)H-Index: 13
Last. Ke Zhang (CAS: Chinese Academy of Sciences)H-Index: 2
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Abstract Better understanding the evolutionary mechanism of landslides is very important to predict their occurrence based on firm scientific grounds. The stability of a rock slope is often dominated by one or more locked segments along a potential slip surface with a large bearing capacity to resist instability. We propose three preliminary categories for locked segments and develop a physical model for predicting the instability of rock slopes with locked segments, by coupling a one-dimensiona...
22 CitationsSource
#1Lei Xue (CAS: Chinese Academy of Sciences)H-Index: 9
#2Siqing Qin (CAS: Chinese Academy of Sciences)H-Index: 13
Last. Baicun Yang (CAS: Chinese Academy of Sciences)H-Index: 5
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The focus of the present study is to explain the stair-step brittle deformation evolutionary pattern of the landslide and reveal the corresponding internal physical mechanism. Based on the ...
6 CitationsSource
#1Lei Xue (CAS: Chinese Academy of Sciences)H-Index: 9
#2Meng Qi (NCWU: North China University of Water Conservancy and Electric Power)H-Index: 2
Last. Miaomiao Wang (CAS: Chinese Academy of Sciences)H-Index: 2
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In this paper, we have investigated the quantitative relationship between the axial strain threshold at the volumetric strain reversal point (e 1cd) and the strain threshold at the peak stress (e 1ucs) during the uniaxial compression tests. We found that normalized values of e 1ucs/e 1cd for different rock types are typically ~1.34(±0.24). This is especially true for igneous and metamorphic rocks, or low-porosity sedimentary rocks. To verify this finding, we investigated seven granitic gneiss sa...
19 CitationsSource
#1Lei Xue (CAS: Chinese Academy of Sciences)H-Index: 9
#2Meng Qi (NCWU: North China University of Water Conservancy and Electric Power)H-Index: 2
Last. Miaomiao Wang (CAS: Chinese Academy of Sciences)H-Index: 2
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This paper investigated the theoretical relationship between the axial strain thresholds at the volumetric strain reversal point (e 1cd) and the strain threshold at the peak stress (e 1ucs) during a uniaxial compression test. Firstly, we used renormalization group theory with the stress transfer mechanism to reveal the essence of the phase transition phenomenon at the axial strain threshold (e 1cd). Then, we constructed mathematical expressions for e 1ucs and e 1cd, respectively. Finally, a theo...
9 CitationsSource
#1Lei Xue (CAS: Chinese Academy of Sciences)H-Index: 9
#2Siqing Qin (CAS: Chinese Academy of Sciences)H-Index: 13
Last. Xiaohua Pan (ZJU: Zhejiang University)H-Index: 7
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Abstract Two quantitative displacement criteria for slope deformation were deduced through the combination of a one-dimensional renormalization group model and the strain-softening constitutive model of geological materials. The criteria can be used to understand the mechanical process from the onset of the accelerating creep on a slope, through brittle rupture, to the final failure and landslides. The study showed that according to the first criterion, the displacement ratio between the brittle...
26 CitationsSource
#1Lei Xue (CAS: Chinese Academy of Sciences)H-Index: 9
#2Siqing Qin (CAS: Chinese Academy of Sciences)H-Index: 13
Last. Haitao Qian (CEA: China Earthquake Administration)H-Index: 1
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Abstract It was found that the crack damage stress threshold, σ cd , is a phase transition point during the deformation process of rock and is equivalent to the unstable fixed point of renormalization group theory. Thus, a relationship exists between the renormalization group theory and the rock deformation process, through which we can investigate the critical behavior of rock deformation. Therefore, an improved renormalization group model, which takes into account the different stress transfer...
16 CitationsSource
#1Lei Xue (CAS: Chinese Academy of Sciences)H-Index: 9
#2Siqing Qin (CAS: Chinese Academy of Sciences)H-Index: 13
Last. Wei Chao LiH-Index: 7
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When rock samples are loaded until macroscopic fractures develop, the failure process can be divided into several stages based on axial and lateral strain responses or the acoustic emission sequence during uniaxial compression tests. Several stress thresholds may be identified: the crack closure stress σ cc, crack initiation stress σ ci, crack damage stress σ cd, and uniaxial compressive strength σ ucs; these may be used as a warning indicator for rock rupture. We investigated the crack damage s...
94 CitationsSource
#1Siqing Qin (CAS: Chinese Academy of Sciences)H-Index: 13
#2Xi-Wei Xu (CEA: China Earthquake Administration)H-Index: 4
Last. Xiaohua Pan (CAS: Chinese Academy of Sciences)H-Index: 7
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This study attempts to reveal the possible linkage between the critical failure-fracture and creep process of locked patches in a seimogenic fault. It suggests that the ratio of cumulative Benioff strain of the fracture point to that of the start point of accelerating creep on each locked patch depends on the number of locked patches in an exponential rule with a base value 1.48. Prior to the failure of the last locked patch, the critical failure-fracture of each patch may produce a preshock of ...
13 CitationsSource
#1Siqing Qin (CAS: Chinese Academy of Sciences)H-Index: 13
#2Jiu Jimmy Jiao (HKU: University of Hong Kong)H-Index: 48
Last. Zhigang Li (CAS: Chinese Academy of Sciences)H-Index: 1
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This paper studies the unstable mechanisms of the mechanical system that is composed of the stiff hosts (roof and floor) and the coal pillar using catastrophe theory. It is assumed that the roof is an elastic beam and the coal pillar is a strain-softening medium which can be described by the Weibulls distribution theory of strength. It is found that the instability leading to coal bump depends mainly on the systems stiffness ratio k, which is defined as the ratio of the flexural stiffness of the...
39 CitationsSource