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Theoretical and experimental study on the rheological properties of WIS grout and the dispersion and sealing mechanism

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International Journal of Mining Science and Technology 2022年第4期32卷 669-684页

作者： Mengmeng Zhou Shucai Li Zhuo Zheng Rentai Liu Mengjun Chen Chenyang Ma ARC Research Hub for Computational Particle Technology Department of Chemical EngineeringMonash UniversityClayton 3800Australia Geotechnical and Structural Engineering Research Center Shandong UniversityJinan 250061China

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.

关键词： WIS grout material Grouting treatment water inflow Sealing mechanism Flow regularity

Key issues in water sealing performance of underground oil storage caverns: Advances and perspectives

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第10期15卷 2787-2802页

作者： Yutao Li Bin Zhang Lei Wang Yiguo Xue Hanxun Wang Lei Shi Zhenhua Peng Junyan Li School of Engineering and Technology China University of Geosciences(Beijing)Beijing100083China Department of Civil and Architectural Engineering and Construction Management University of CincinnatiCincinnatiOH45221USA CNOOC Petrochemical Engineering Co. Ltd.Qingdao266061China

water sealing performance is important for underground water-sealed oil storage(UWSOS).The key issues concerning water sealing performance mainly include the permeability of fractured rock mass(FRM),water-sealed safety(WSS),water curtain performance,and prediction and control of water *** paper reviews the progress of above four key issues on water sealing ***,the permeability of an FRM is the basis of water sealing performance,and several commonly used permeability test methods and spatial variation characteristics of permeability are ***,the current water sealing criteria are compared,and the evaluation methods of WSS are ***,the design parameters and efficiency evaluation of water curtain systems(WCSs)are *** water inflow of oil storage caverns(OSCs)can reflect the water sealing effect,and the prediction methods and control measures of water inflow are also ***,the advantages and disadvantages of the current research are discussed,and the potential research directions are pointed out,such as optimization of water sealing criteria and FRM model,quantitative evaluation of WCS efficiency,accurate prediction of water inflow,and improvement of grouting technology.

关键词： Underground water-sealed oil storage (UWSOS) water-sealed safety(WSS) water curtain system(WCS) water inflow Fractured rock mass permeability

Approximate analytical solution for seepage field of drained tunnel in vertically stratified phreatic aquifer

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Journal of Mountain Science 2022年第5期19卷 1437-1455页

作者： MENG Wei HE Chuan WU Fang-yin YANG Wen-bo KOU Hao ZHOU Zi-han GUO De-ping MENG Hai-long Key Laboratory of Transportation Tunnel Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China Xuzhen Railway Co. LtdZhaotong 657900China Sichuan Mianjiu Expressway Co. LtdChengdu 621000China

To explore the water table and water inflow after tunnel excavation in a vertically stratified phreatic aquifer,approximate analytical solutions for the steady-state water table and water inflow of a drained tunnel in a vertically stratified phreatic aquifer were obtained based on the Dupuit assumptions and the integral *** comparing the approximate analytical solutions with numerical solutions,it was found that the relative error of the approximate analytical solution for the water table elevation is less than 10%,and the relative error of the approximate analytical solution for the water inflow is approximately 25%.The sources of the above errors are as follows:(1)At the lateral boundary of water replenishment,the water surface should be tangent to the horizontal line,but the water surface for the approximate analytical solutions has a gradient.(2)At the vertical boundaries near the tunnel,the total head is variable,but the total head for the approximate analytical solutions is assumed to be constant.(3)The Dupuit assumptions are applied in the flow domain near the *** the relative errors of the approximate analytical solutions for the water table elevation and water inflow are evident,the lowered water table is reflected in the approximate analytical solutions.

关键词： Dupuit assumptions water table water inflow Tunnel engineering Equipotential line Integral method

Drainage-induced ground response in a twin-tunnel system through analytical prediction over the seepage field

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Underground Space 2022年第3期7卷 408-418页

作者： Cheng-wei Zhu Wei Wu Hong-wei Ying Xiao-nan Gong Pan-pan Guo Research Center of Coastal and Urban Geotechnical Engineering HangzhouChina Institut fur Geotechnik Universitat fur BodenkulturFeistmantelstrasse 4A-1180 ViennaAustria Institute of Geotechinical Engineering Hohai UniversityNanjingChina

Leakage-induced hydraulic and ground responses in a twin-tunnel system are analyzed via the proposed analytical solution on the seepage *** seepage continuity conditions are rigorously satisfied at the interface between the ground and the tunnel lining,in terms of both water pressure and seepage *** analytical solution is verified by comparing the results of numerical simulations.A detailed parametric analysis is carried out to explore the effect of tunnels’spatial layouts and degraded waterproof facilities on leakageinduced hydraulic and ground response,including head decline,water inflow and ground surface *** results show that the often used single tunnel model tends to overestimate the pore pressure on the lining along with water inflow into the tunnel,and underestimate the leakage-induced ground settlement.

关键词： Twin tunnel Leakage Head decline water inflow Ground settlement

Influence of asymmetric blockage of the drainage system of a deep-buried tunnel on water gushing

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Journal of Mountain Science 2022年第7期19卷 2075-2085页

作者： FU He-lin AN Peng-tao WU Yi-min LI Jie CHEN Long School of Civil Engineering Central South UniversityChangsha410075China National Engineering Laboratory for Construction Technology of High Speed Railway Central South UniversityChangsha410075China

Asymmetric blockage of drainage systems occasionally occurs,which seriously threatens the safety of tunnel *** on theoretical analysis,a calculation expression of tunnel water inflow involving clogging parameters was *** of the analytical solution was analysed with the Taylor equation and series expansion theorem,and a tunnel under construction was considered to conduct field tests to verify the rationality of the established model and correctness of the derived *** have demonstrated that with increasing drainage system blockage degree,the amount of water inflow in the nonblocked area slowly increases,and the total amount of water in the tunnel gradually *** hydrodynamic pressure in the blocked area non-linearly decreased,and the water inrush velocity and hydraulic gradient in the non-blocked area gradually *** the drainage system was not blocked,the result of tunnel water inflow calculated by the formula derived in this paper was 8.3% higher than the measured *** the drainage system was blocked,the theoretical water inflow was 10.5% higher than the measured *** difference between the measured value and the theoretical value is small,which verifies the effectiveness of the calculation formula of water inflow deduced in this paper.

关键词： Drainage system Asymmetric blockage water inflow Field test