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| 1 | Protection against water or mud inrush in tunnels by grouting:A review显示文摘Grouting is a major method used to prevent water and mud inrush in tunnels and underground engineering.In this paper,the current situation of control and prevention of water and mud inrush is summarized and recent advances in relevant theories,grout/equipment,and critical techniques are introduced.The time-variant equations of grout viscosity at different volumetric ratios were obtained based on the constitutive relation of typical fast curing grouts.A large-scale dynamic grouting model testing system(4000 mm × 2000 mm × 5 mm) was developed,and the diffusions of cement and fast curing grouts in dynamic water grouting were investigated.The results reveal that the diffusions of cement grouts and fast curing grouts are U-shaped and asymmetric elliptical,respectively.A multiparameter real-time monitoring system(φ = 1.5 m,h = 1.2 m) was developed for the grouting process to study the diffusion and reinforcement mechanism of grouting in water-rich faulted zone.A high early strength cream-type reinforcing/plugging grout,a high permeability nano-scale silica gel grout,and a high-expansion filling grout were proposed for the control of water hazards in weak water-rich faulted zone rocks,water inrush in karst passages,and micro-crack water inrush,respectively.Complement technologies and equipment for industrial applications were also proposed.Additionally,a novel full-life periodic dynamic water grouting with the critical grouting borehole as the core was proposed.The key techniques for the control of water inrush in water-rich faulted zone,jointed fissures and karst passages,and micro-crack water inrush were developed. | Shucai Li Rentai Liu Qingsong Zhang Xiao Zhang | 2016 | Journal of Rock Mechanics and Geotechnical Engineering2016，8，5： | 27 |
| 2 | Quantitatively assessing the pre-grouting effect on the stability of tunnels excavated in fault zones with discontinuity layout optimization:A case study显示文摘Pre?grouting is a popular ground treatment strategy utilized to enhance the strength and stability of strata during the excavation of a tunnel through a fault zone.Two important questions need to be answered during such an excavation.First,how should the grouting size be determined?Second,when should excavation begin after grouting?These two questions are conventionally addressed through empirical experience and standard criteria because a reliable quantitative approach,which would be preferable,has not yet been developed.To address these questions,we apply a recently proposed numerical approach known as discontinuity layout optimization,an efficient node-based upper bound limit analysis method.A case study is provided utilizing a tunnel located in a stratum characterized by complicated geological conditions,including soft soil and a fault zone.The factor of safety is used to quantitatively assess the stability of the tunnel section.The influences of the grouted zone thickness and the time-dependent material properties of the grouted zone on the stability of the tunnel section are evaluated,thereby assisting designers by quantitatively assessing the effects of pre-grouting. | Xiao YAN Zizheng SUN Shucai LI Rentai LIU Qingsong ZHANG Yiming ZHANG | 2019 | Frontiers of Structural and Civil Engineering2019，13，6： | 5 |
| 3 | Super-absorbent swellable polymer as grouting material for treatment of karst water inrush显示文摘Grouting is the most commonly used method to control water inrush in underground engineering.Traditional cement-based materials are easy to dilute and hard to coagulate under the influence of large flow and high-velocity water inrush.To address these deficiencies,a new type of polymer grouting material with an excellent expansion ratio was synthesised.The material quickly absorbs water and has an expansion ratio of 1:300.The material is composed of a superabsorbent polymer(SAP),glycerol,and ethanol.The effects of water quality on the expansion ratio and expansion rate of the material were examined,and the best solid–liquid ratio for the slurry was determined by fluidity measurements.A karst specially designed pipeline water inrush test device showed that 800 g of SAP can achieve 0.6 m/s water flow blockage in the smooth pipeline,demonstrating that the ability of the SAP slurry to block water inrush is superior to those of other materials.This study provides a reference for water inrush plugging,and has important implications for the reduction and control of karst pipeline-type water inrush disasters,ensuring the safety of construction sites and preventing loss of life and damage to property. | Shucai Li Chenyang Ma Rentai Liu Mengjun Chen Jia Yan Zhenjun Wang Shaolong Duan Huasheng Zhang | 2021 | International Journal of Mining Science and Technology2021，31，5： | 2 |
| 4 | A tracer experiment study to evaluate the CALPUFF real time application in a near-field complex terrain setting显示文摘 | Huiling cui Rentai Yao Xiangjun Xu Cuntian Xin jinming Yang | 2011 | Atmospheric Environment2011，，39： | 1 |
| 5 | Investigation of the Mechanism of Grout Penetration in Intersected Fractures显示文摘To study the penetration mechanism of cement-based slurry in intersected fractures during grouting and the related pressure distribution,we have used two different variants of cement,namely,basic cement slurry and fast-setting cement slurry.The influence of a retarder,time-varying viscosity,fracture width and location of injection hole is also considered.A finite element software is used to implement two and three-dimensional numerical models for grouting of intersected fractures in hydrostatic conditions.Results show that there are significant differences in the diffusion morphology and pressure distribution depending on the considered cement slurry.Retarder can effectively slow down the rising rate of injection pressure and extend the diffusion distance of grout.The influence of the branch fracture is more important when basic cement slurry is considered,indicating that the change of grout pressure is correlated with the slurry viscosity.The faster the viscosity increases,the less evident is the effect. | Yanxu Guo Peng Zhao Qingsong Zhang Rentai Liu Lianzhen Zhang Yankai Liu | 2019 | Fluid Dynamics & Materials Processing2019，15，4： | 1 |
| 6 | Research on pavement cracking possibility based on the load mechanical response显示文摘Cavities under roads are one of the main reasons for early structural damage to pavements. It is necessary to conduct a structural analysis of road sections with cavities and evaluate the possibility of pavement cracking caused by different cavity sizes. In this study, an analysis method for evaluating the possibility of pavement cracking based on the load-mechanical response is proposed.An example library of the mechanical response of asphalt concrete(AC) pavements was established by numerical simulation.Based on the tensile cracking characteristics of pavements in the mechanical response research, the tensile strain at the bottom of the AC layer was selected as the key analysis parameter. Sensitivity analysis of the tensile strain was conducted, and the main factors controlling pavement cracking were determined. A tensile strain response prediction model was established using multiple linear regression, and its reliability was verified. The cavity influence coefficient(CIC) and pavement cracking factor(PCF) were constructed to analyze the cracking possibility. The variation in PCF with the cavity size and pavement structure parameters was studied. A quantitative relationship between the depth and length of the cavity for a given PCF was obtained.This law conforms to a power function. The possibility of pavement cracking can be determined by measuring the cavity size.Compared to the existing cavity management system, the proposed method provided analysis results of the cracking possibility that were more consistent when the cavity depth was small and the length was long. The findings of this study provide new insights for evaluating the possibility of pavement cracking. | WANG Meng LI ShuCai LIU RenTai ZHANG ChunYu ZHU ZhiJing ZHANG LianZhen BAI JiWen | 2023 | Science China(Technological Sciences)2023，66，12： | 0 |
| 7 | Theoretical and experimental study on the rheological properties of WIS grout and the dispersion and sealing mechanism显示文摘Recently a new grout material called water inflow sealing(WIS) was invented for sealing water inflow in tunneling and underground constructions. In this study, a special experimental method called intubated counter grouting(ICG) was proposed to investigate the influence of water dispersion on the rheological properties of the grout during the grouting process, and to testify the sealing performance of the grout,such as instant gelling ability(IGA) and anti-dispersion ability(ADA). In the experiment, dispersion was restricted in the downstream of the channel with a high turbulence intensity. The influences of ADA and IGA were therefore decoupled and evaluated separately. Experimental results revealed two distinctive sealing mechanisms of WIS. For a low initial velocity of water, WIS turned the shear flow of water into an overall movement of a plug by absorbing water into the particles. For a high initial velocity and the situation that the particles reached the outlet before sufficiently expanding, WIS modified the rheology of the water in the channel and reduced its velocity till the static state. The distinctive feature of WIS brings a reformation on the sealing mechanism and provides an effective way to control water inflow with high pressure and velocity. | Mengmeng Zhou Shucai Li Zhuo Zheng Rentai Liu Mengjun Chen Chenyang Ma | 2022 | International Journal of Mining Science and Technology2022，32，4： | 0 |
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