Xiaokai Niu
YOU?
Author Swipe
View article: Effect of AMPS-based polycarboxylate superplasticizer on early hydration of cement and its mechanism
Effect of AMPS-based polycarboxylate superplasticizer on early hydration of cement and its mechanism Open
View article: Special Cement-Based Grouting Material for Subway Structure Repair During Operation Performance Sensitivity Analysis
Special Cement-Based Grouting Material for Subway Structure Repair During Operation Performance Sensitivity Analysis Open
This study uses ordinary Portland–sulfate–silicate composite cement as the matrix and investigates the effects of water–cement ratio, HPMC dosage, and PCS dosage on the performance of specialized grouting materials for subway structure rep…
View article: Optimization of mix proportion of super-early-strength cement grouting material and experimental study on its working performance
Optimization of mix proportion of super-early-strength cement grouting material and experimental study on its working performance Open
View article: Impact of Multi-Defect Coupling Effects on the Safety of Shield Tunnels and Cross Passages
Impact of Multi-Defect Coupling Effects on the Safety of Shield Tunnels and Cross Passages Open
As urban rail transit networks age, understanding the synergistic impacts of multi-defect interactions on tunnel structural safety has become critical for underground infrastructure maintenance. This study investigates defect interaction m…
View article: Analysis and Prediction of Deformation of Shield Tunnel Under the Influence of Random Damages Based on Deep Learning
Analysis and Prediction of Deformation of Shield Tunnel Under the Influence of Random Damages Based on Deep Learning Open
Shield tunnels in operation are often affected by complex geological conditions, environmental factors, and structural aging, leading to cumulative damage in the segments and, consequently, increased deformation that compromises structural…
View article: Safety Evaluation of Operational Metro Shield Tunnels Considering Typical Disease States with Variable Weight Theory
Safety Evaluation of Operational Metro Shield Tunnels Considering Typical Disease States with Variable Weight Theory Open
View article: Study on the Influence of the Performance Weakening of the Disconnectable Coupling (DC) Joint of Steel Support on the Retaining Structure of a Foundation Pit
Study on the Influence of the Performance Weakening of the Disconnectable Coupling (DC) Joint of Steel Support on the Retaining Structure of a Foundation Pit Open
In order to quantitatively study the influence of the weakening of the disconnectable coupling joint (DC joint) on the retaining structure, the pre-axial force retention performance of the steel support, the axial force of the steel suppor…
View article: In Situ Test and Numerical Analysis of the Subway-Induced Vibration Influence in Historical and Cultural Reserves
In Situ Test and Numerical Analysis of the Subway-Induced Vibration Influence in Historical and Cultural Reserves Open
Although the rapid expansion of urban rail transit offers convenience to citizens, the issue of subway vibration cannot be overlooked. This study investigates the spatial distribution characteristics of vibration in the Fayuan Temple histo…
View article: Mechanical Properties of Disconnectable Coupling Joints for Steel Bracing under Eccentric Load
Mechanical Properties of Disconnectable Coupling Joints for Steel Bracing under Eccentric Load Open
Disconnectable coupling (DC) joints of steel bracing in foundation pit engineering are inevitably subjected to eccentric load, but their mechanical properties under eccentric load have not been thoroughly investigated. Based on full-scale …
View article: Research on the Application of Backwall Grouting in Leakage Treatment of Operating Tunnels
Research on the Application of Backwall Grouting in Leakage Treatment of Operating Tunnels Open
In order to study the application of grouting behind the lining wall in the treatment of leakage of subway tunnel during the operation period, the diffusion effect of grouting behind the wall in dense fill and loose fill was studied by the…
View article: Investigation of Lade‐Kim Plastic Potential Applicability under Various Stress Paths for Rockfill Materials
Investigation of Lade‐Kim Plastic Potential Applicability under Various Stress Paths for Rockfill Materials Open
The dilatancy behavior of rockfill materials shows obvious stress path dependence. Lade‐Kim plastic potential equation has been proposed for a long time to model the mechanical behavior of sand and concrete materials. However, it lacks the…
View article: Mechanical Behavior of Tunnel Lining with Cracks at Different Positions
Mechanical Behavior of Tunnel Lining with Cracks at Different Positions Open
Cracks in the lining significantly reduce the safety of a tunnel during operation. It is urgent to figure out the influence of cracks on tunnel carrying capacity. In this paper, three-dimensional model tests were conducted to investigate d…
View article: Formulation of Anisotropic Strength Criterion for Geotechnical Materials
Formulation of Anisotropic Strength Criterion for Geotechnical Materials Open
A new nonlinear unified strength (NUS) criterion is obtained based on the spatially mobilized plane (SMP) criterion and Mises criterion. New criterion is a series of smooth curves between SMP curved triangle and Mises circle in the π plane…
View article: Parameter Optimization on the Forced Ventilation of Symmetric Tunnel Construction Based on the Super-Short Bench-Cut Method
Parameter Optimization on the Forced Ventilation of Symmetric Tunnel Construction Based on the Super-Short Bench-Cut Method Open
To exploit the influence of the tunnel face and the distance between the diameter and the orifice of a blast pipe on the ventilation effect in symmetric tunnel construction, this paper uses Fluent to establish a three-dimensional model and…
View article: Bridge Responses Induced by Adjacent Subway Station Construction Using Shallow Tunneling Method
Bridge Responses Induced by Adjacent Subway Station Construction Using Shallow Tunneling Method Open
This paper presents a case of subway station construction under an existing prestressed concrete bridge with a three‐span continuous beam located at the intersection of the 3rd Ring Road, Beijing. The Huayuan Subway Station of line 6, cons…
View article: Study of Deformation Control and Rule of Tunnel which Passes Underneath the Existing Tunnel in Underground Excavation of Subway Station
Study of Deformation Control and Rule of Tunnel which Passes Underneath the Existing Tunnel in Underground Excavation of Subway Station Open
Olympic Park Station of Beijing metro line 15 parallel closely crosses the existing large tunnel. Such a long distance to cross the existing tunnel, which is the first time in China. In order to control the deformation of existing tunnel, …