Evaluation of changes in rock mass permeability due to long-time repeated mining

2014 ◽  
pp. 179-186
Keyword(s):  
Rock Mass ◽  
Long Time ◽  
Rock Mass Permeability

Estimation of rock mass permeability using variation in hydraulic conductivity with depth: experiences in hard rocks of western Turkey

2017 ◽  
Vol 77 (4) ◽  
pp. 1663-1671 ◽  
Author(s):  
Vincenzo Piscopo ◽  
Antonella Baiocchi ◽  
Francesca Lotti ◽  
Emre A. Ayan ◽  
Alper R. Biler ◽  
...  
Keyword(s):  
Rock Mass ◽  
Hydraulic Conductivity ◽  
Western Turkey ◽  
Hard Rocks ◽  
Rock Mass Permeability

A New Method for Real-Time Monitoring of Grout Spread Through Fractured Rocks

2008 ◽  
Vol 1107 ◽  
Author(s):  
Alasdair E. Henderson ◽  
Iain A. Robertson ◽  
John M Whitfield ◽  
Graham F.G. Garrard ◽  
Nicholas G. Swannell ◽  
...  
Keyword(s):  
Rock Mass ◽  
Real Time ◽  
Fractured Rock ◽  
Field Trials ◽  
New Method ◽  
Real Time Monitoring ◽  
Retrieval Method ◽  
Extensive Field ◽  
Grout Spread ◽  
Rock Mass Permeability

AbstractReducing water ingress into the Shaft at Dounreay is essential for the success of future intermediate level waste (ILW) recovery using the dry retrieval method. The reduction is being realised by forming an engineered barrier of ultrafine cementitious grout injected into the fractured rock surrounding the Shaft. Grout penetration of 6m in <50μm fractures is being reliably achieved, with a pattern of repeated injections ultimately reducing rock mass permeability by up to three orders of magnitude.An extensive field trials period, involving over 200 grout mix designs and the construction of a full scale demonstration barrier, has yielded several new field techniques that improve the quality and reliability of cementitious grout injection for engineered barriers.In particular, a new method has been developed for tracking in real-time the spread of ultrafine cementitious grout through fractured rock and relating the injection characteristics to barrier design. Fieldwork by the multi-disciplinary international team included developing the injection and real-time monitoring techniques, pre- and post injection hydro-geological testing to quantify the magnitude and extent of changes in rock mass permeability, and correlation of grout spread with injection parameters to inform the main works grouting programme.

Seepage Field-Strain Field Coupling Analysis for Rock Masses of Coal Seam Floor during Mining Based on COMSOL

2014 ◽  
Vol 1010-1012 ◽  
pp. 1467-1470 ◽  
Author(s):  
Yun Jie Zhang ◽  
Cheng Fan
Keyword(s):  
Rock Mass ◽  
Permeability Coefficient ◽  
Fractured Rock ◽  
Dynamic Change ◽  
Stress And Strain ◽  
Seepage Field ◽  
Coupling Analysis ◽  
Field Coupling ◽  
Limestone Aquifers ◽  
Rock Mass Permeability

Based on the fluid-solid coupling theory, The fractured rock mass was described as a continuous porous medium, and consider the rock mass permeability coefficient has a relationship with the stress and strain. The dynamic change of permeability coefficient was achieved using the multi-physics coupling analysis software COMSOL, and found that the stress and strain of surrounding rocks changes a lot due to mining. The maximum stress and strain in the mudstone area reaches 2-3 times of the original one, which happened at the immediate roof of mined-out area. According to the analysis of seepage field, mining does not destroy water resistance of floor aquifer. Mining fissures do not connect limestone aquifers, and water in the limestone is less likely to flow into stop to cause damage.

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