Groundwater control and curtain grouting for tunnel construction in completely weathered granite

2017 ◽  
Vol 77 (2) ◽  
pp. 515-531 ◽  
Author(s):  
Jinquan Liu ◽  
Weizhong Chen ◽  
Jingqiang Yuan ◽  
Changjun Li ◽  
Qingyan Zhang ◽  
...  
Keyword(s):  
Tunnel Construction ◽  
Weathered Granite ◽  
Curtain Grouting ◽  
Completely Weathered Granite

The Influence of Engineering Factors to Groundwater Recovery in Mountain Tunnel

2013 ◽  
Vol 353-356 ◽  
pp. 1490-1494
Author(s):  
Zhi Chun Liu
Keyword(s):  
Groundwater Flow ◽  
Volume Change ◽  
Flow Model ◽  
Recovery Process ◽  
Tunnel Construction ◽  
Groundwater Inflow ◽  
Essential Condition ◽  
Curtain Grouting ◽  
Efficient Measures ◽  
Mountain Tunnel

Groundwater flow into mountain tunnel can lead to drawdown and groundwater loss in tunnel construction and operation stages under drainage and limited drainage principle conditions. The author defines groundwater recovery degree of drawdown and volume change, and simulate drawdown and groundwater recovery process adopting nonhomogeneous and anisotropic equivalent tunnel flow model, and study influencing effect of various factors to groundwater recovery by numerical method. The results show that the essential condition of groundwater recovery in tunnel is that groundwater recharge is greater than groundwater inflow volume, which can be controlled by efficient waterproof and drainage measures. The efficient measures include curtain grouting, radial grouting and high impermeability performance of shotcrete.

Classification of Engineering Properties of Tropical Boulder in Completely Weathered Granite in Johor, Malaysia

2020 ◽  
Vol 17 (2) ◽  
pp. 1059-1069
Author(s):  
Mohd Firdaus Md Dan ◽  
Edy Tonnizam Mohamad ◽  
Ibrahim Komoo ◽  
Aziman Madun ◽  
Siti Norsalkini Mohd Akip Tan
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Point Load ◽  
Engineering Properties ◽  
Dry Density ◽  
Petrographic Analysis ◽  
Point Load Strength ◽  
Weathered Granite ◽  
Completely Weathered Granite

Engineering properties of tropical weathered granite mass have been widely investigated and classified for engineering purposes. However, the engineering properties of tropical boulder in weathered granite profile is poorly understood and not well classified. This study aims to examine and classify the physico-mechanical properties of granite boulder in completely weathered zone. A total of 34 in-situ boulders were examined from two granite quarries located in Southern Johor, Malaysia. Microstructure-mineralogical alterations were analyzed based on petrographic analysis and scanning electron microscopy (SEM). The mechanical properties were including dry density, porosity, point load strength, uniaxial compressive strength and permeability. Three properties were identified as significant indicators to differentiate between tropical boulder and completely weathered granite when it is evaluated from the soil investigation drilling work namely; texture characteristics, discolourations and degree of weathering. Analysis revealed that the alteration of microstructures and minerals such as feldspar, biotite, and plagioclase from corestone (Grade I/II) to saprolite (Grade IV/V) zone were significantly reduced the dry density, point load strength, uniaxial compressive strength and permeability with 32%, 99.5%, 98.6% and 84.8%, respectively. It has also significantly increased the porosity up to 11.6 times or 1065% from corestone to saprolite. The significant different of physico-mechanical properties of material surrounding boulder due to weathering can be classified and useful in evaluation of geotechnical design and geological engineering applications.

scholarly journals Grouting Treatment of Water and Mud Inrush in Fully Weathered Granite Tunnel: A Case Study

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Jiandong Niu ◽  
Yong Sun ◽  
Bin Wang ◽  
Keneng Zhang ◽  
Youhan Huang ◽  
...  
Keyword(s):  
Water Inrush ◽  
Engineering Application ◽  
Treatment Method ◽  
Economic Losses ◽  
Hydrological Conditions ◽  
Weathered Granite ◽  
Transient Electromagnetic ◽  
Weak Part ◽  
Curtain Grouting ◽  
Water And Mud Inrush

When mountain tunnel passes through completely weathered granite strata, water and mud inrush is easy to occur, causing casualties and economic losses. Grouting is a common and effective treatment method for water and mud inrush disaster. The current existing researches focus on theoretical analysis, numerical simulation, and laboratory test, and the researches based on the field of engineering application are few. Based on the fully weathered granite tunnel of Junchang tunnel in Guangxi, this paper studies the grouting treatment of water and mud disaster in the fully weathered granite tunnel. This paper first introduces the geological and hydrological conditions of Junchang tunnel in order to understand the causes of water inrush and mud inrush. Then, the treatment method of full-section curtain grouting is introduced. During the grouting, the combination of exploration and injection is adopted. According to different hydrological conditions, different kinds of grouting materials are adopted. After grouting is completed, Transient Electromagnetic Methods, water inflow analysis, borehole investigation, and P-Q-T method are used to evaluate the grouting effect. According to the reaction of the detection results, the weak part of grouting can be supplemented to improve the grouting quality. The results show that the curtain grouting is effective for the treatment of water-mud inrush disaster in the fully weathered granite tunnel. This study provides a reference for the treatment of water and mud inrush in other similar tunnels.

scholarly journals Research on the reinforcement measures of close-parallel tunnels

2020 ◽  
Vol 198 ◽  
pp. 02030
Author(s):  
Li Meng ◽  
Hu Ping ◽  
Ma Liang
Keyword(s):  
Numerical Analysis ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Rail Transit ◽  
Reinforcement Effect ◽  
Double Line ◽  
Curtain Grouting ◽  
Bored Piles ◽  
Reinforcement Measures ◽  
Close Parallel

Based on shallow parallel underground tunnel and double-line shield tunnel of Jinan Rail Transit Line R3, this paper proposes two reinforcement measures including bored piles and curtain grouting in the middle of the tunnel, making a numerical analysis and comparison of the reinforcement effect. The results show that the influence of later tunnel construction on the deformation of earlier tunnel can be effectively reduced after taking two reinforcement measures respectively and the reinforcement effect of the bored piles is better.

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