Zhaoxi Yan
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Zhaoxi Yan has a total of 8 co-authors. Here are the top co-authors by number of shared publications:
- Peng Guan
School of Architectural Engineering, Guangzhou Institute of Technology, Guangzhou 510540, China
2 shared publications - Xiang Li
State Key Laboratory of Tunnel Engineering, School of Civil Engineering, Sun Yat-Sen University, Guangzhou 510275, China
2 shared publications - Jiasheng Zhang
The Second Geological Brigade of Jiangxi Geological Bureau, Jiujiang 332000, China
1 shared publication - Lei Yu
Hubei Shenlong Municipal Construction Engineering Co., Ltd., Wuhan 430000, China
1 shared publication - Lei Zhang
The Second Geological Brigade of Jiangxi Geological Bureau, Jiujiang 332000, China
1 shared publication - Wenlong Shang
The Second Geological Brigade of Jiangxi Geological Bureau, Jiujiang 332000, China
1 shared publication
Latest Publications
- Open Access
Theoretical H-M Capacity Envelope for Large-Diameter Rigid Piles Embedded in Sandy Slopes
Large-diameter rigid piles often serve as foundations on sloping ground, where combined lateral force and overturning moment constitute important design considerations. While bearing-capacity envelope approaches have been developed for rigid piles in clay, corresponding theoretical methods for piles in sand remain relatively limited, despite the strong influence of overburden pressure and slope effects on their lateral resistance. This study extends the previous six-mode methodology to develop a theoretical framework for the - capacity envelope of large-diameter rigid piles embedded in sandy slopes. The proposed method adopts the previously established failure wedge model, incorporating a variable wedge base angle and equivalent-depth correction, and extends its unidirectional formulation to account for uphill and downhill resistance through the sign of the slope angle. Additional resistance components, including distributed vertical shear-induced moment, base shear, and base moment, are incorporated to account for the size effects of large-diameter piles. The complete - envelope is constructed from parametric equations corresponding to six soil-pile interaction models. Comparisons with finite element limit analyses and independent experimental and numerical results show reasonable agreement within the investigated conditions. Parametric analyses indicate that, within the parameter ranges considered, the fan angle has a more pronounced influence on the envelope than the interface friction angle, while the additional resistance components become increasingly relevant with increasing pile diameter and decreasing length-to-diameter ratio. The slope angle progressively increases the asymmetry of the - envelope; in the investigated case with a slope angle of , the Q2 and Q4 regions account for 89.9% and 6.3% of the total envelope area, respectively. The proposed framework provides a relatively simple theoretical approach for estimating the ultimate - capacity of rigid piles on sandy slopes and may serve as a useful reference for preliminary assessment and design, where available analytical guidance remains limited.Open AccessTheoretical H-M Capacity Envelope for Large-Diameter Rigid Piles Embedded in Sandy Slopes
Large-diameter rigid piles often serve as foundations on sloping ground, where combined lateral force and overturning moment constitute important design considerations. While bearing-capacity envelope approaches have been developed for rigid piles in clay, corresponding theoretical methods for piles in sand remain relatively limited, despite the strong influence of overburden pressure and slope effects on their lateral resistance. This study extends the previous six-mode methodology to develop a theoretical framework for the - capacity envelope of large-diameter rigid piles embedded in sandy slopes. The proposed method adopts the previously established failure wedge model, incorporating a variable wedge base angle and equivalent-depth correction, and extends its unidirectional formulation to account for uphill and downhill resistance through the sign of the slope angle. Additional resistance components, including distributed vertical shear-induced moment, base shear, and base moment, are incorporated to account for the size effects of large-diameter piles. The complete - envelope is constructed from parametric equations corresponding to six soil-pile interaction models. Comparisons with finite element limit analyses and independent experimental and numerical results show reasonable agreement within the investigated conditions. Parametric analyses indicate that, within the parameter ranges considered, the fan angle has a more pronounced influence on the envelope than the interface friction angle, while the additional resistance components become increasingly relevant with increasing pile diameter and decreasing length-to-diameter ratio. The slope angle progressively increases the asymmetry of the - envelope; in the investigated case with a slope angle of , the Q2 and Q4 regions account for 89.9% and 6.3% of the total envelope area, respectively. The proposed framework provides a relatively simple theoretical approach for estimating the ultimate - capacity of rigid piles on sandy slopes and may serve as a useful reference for preliminary assessment and design, where available analytical guidance remains limited. - Open Access
Risk Assessment and Dominant-Factor Identification for Pipe-Joint Misalignment in Pipe Jacking Based on Game-Theory Combination Weighting
Pipe-joint misalignment in pipe-jacking construction is usually confirmed during final quality inspection, but risk signals related to guide-rail gradient deviation, jacking-force utilization, grouting-volume satisfaction, alignment-correction status, and hydrogeological disturbance accumulate during construction. Conventional inspection can determine whether a joint exceeds the allowable limit, but it cannot sufficiently explain risk sources or guide subsequent control. Taking a nominal diameter of 1500 mm (DN1500) steel pipe-jacking project in Wuhan, China, as the study object, this paper establishes a 12-indicator system covering pipe-end geometry and assembly quality, jacking-construction control, and hydrogeological and environmental response. Comprehensive weights are determined by combining a trapezoidal fuzzy analytic hierarchy process (AHP) with an improved criterion importance through inter-criterion correlation (CRITIC) approach using game-theory weighting, after which, a finite-interval cloud model is used to distinguish five risk grades. The results show that the combined weights of water head above the pipe crown, guide-rail gradient deviation, stratigraphic mutation and obstacle score, alignment-correction status, and grouting-volume satisfaction were 0.1803, 0.1737, 0.1702, 0.1027, and 0.0889, respectively, identifying these variables as comparatively influential in this case. All ten evaluated pipe joints were classified as very low risk; however, their memberships in the low-risk and medium-risk grades ranged from 0.0318 to 0.0898 and from 0.0070 to 0.0792, respectively. These differences indicate that the continuous membership vector provides additional information beyond the discrete grade label and can support differentiated post-evaluation rechecking. The proposed framework can therefore provide preliminary support for construction risk early warning and differentiated post-evaluation control, while further validation using larger samples and multiple projects is required.
Open AccessRisk Assessment and Dominant-Factor Identification for Pipe-Joint Misalignment in Pipe Jacking Based on Game-Theory Combination Weighting
Pipe-joint misalignment in pipe-jacking construction is usually confirmed during final quality inspection, but risk signals related to guide-rail gradient deviation, jacking-force utilization, grouting-volume satisfaction, alignment-correction status, and hydrogeological disturbance accumulate during construction. Conventional inspection can determine whether a joint exceeds the allowable limit, but it cannot sufficiently explain risk sources or guide subsequent control. Taking a nominal diameter of 1500 mm (DN1500) steel pipe-jacking project in Wuhan, China, as the study object, this paper establishes a 12-indicator system covering pipe-end geometry and assembly quality, jacking-construction control, and hydrogeological and environmental response. Comprehensive weights are determined by combining a trapezoidal fuzzy analytic hierarchy process (AHP) with an improved criterion importance through inter-criterion correlation (CRITIC) approach using game-theory weighting, after which, a finite-interval cloud model is used to distinguish five risk grades. The results show that the combined weights of water head above the pipe crown, guide-rail gradient deviation, stratigraphic mutation and obstacle score, alignment-correction status, and grouting-volume satisfaction were 0.1803, 0.1737, 0.1702, 0.1027, and 0.0889, respectively, identifying these variables as comparatively influential in this case. All ten evaluated pipe joints were classified as very low risk; however, their memberships in the low-risk and medium-risk grades ranged from 0.0318 to 0.0898 and from 0.0070 to 0.0792, respectively. These differences indicate that the continuous membership vector provides additional information beyond the discrete grade label and can support differentiated post-evaluation rechecking. The proposed framework can therefore provide preliminary support for construction risk early warning and differentiated post-evaluation control, while further validation using larger samples and multiple projects is required.