... Abstract Extensive rock grouting has been carried out during the construction phase of the Cityringen Metro Project. The main goal of the rock grouting has been to reduce the permeability in the rock by filling joints, cracks and fissures, in order to minimize the groundwater inflow during...

... Rock grouting in tunnel construction models and design Håkan Stille Professor, Division of Soil and Rock Mechanics, KTH, Royal Institute of Technology, Stockholm, Sweden Abstract: In the paper a new conceptual model for describing the grouting process with cement based grout in fractured rock...

... Abstract: An access tunnel for the City Line project in Stockholm was excavated in the early parts of 2010. The works also included pre-grouting with cement. The performance of pre-grouting operation was evaluated for 14 continuous fans that included 326 grouted holes. A method called "Real...

... Rock versus porous mass concrete, drilling, scanning, water pressure- and grouting-tests A. Schmitt Björnsen Beratende Ingenieure GmbH, Koblenz, Germany Abstract: The contribution summarizes the experiences from intensive dam site in- vestigations in Germany during the last years and will show how...

... Abstract: In tunnel construction in hard rock, a common method to reduce water in-flow is to perform pre-grouting. The grouting design should be adapted to the current rock mass conditions, as well as to the stated inflow requirement for the tunnel project. One step in the grouting design...

... production logging flow rate laboratory velocity profile production control Upstream Oil & Gas ratio 0 suspension production monitoring frequency rheological property eurock 2012 grout flow curve cement grout ultrasound transducer transducer Reservoir Surveillance hakansson...

..., the water inflow should be minimized. Although cement grout has been applied to reduce the inflow at 460 m depth at the MIU (Mizunami Underground Research Laboratory), the water inflow through narrow fractures which cement grout cannot penetrate might be a problem at deeper under-ground. Colloidal silica...

... Abstract: Grouting is a widely used method for sealing fractured rock masses around underground structures to reduce or stop groundwater inflow. However, even at pre-sent, the filtration and penetration mechanism of cement-based grout have not been clarified sufficiently yet due to complicated...

... and localize discrete deformation zones with high accuracy. AsTDR measurements are influenced by a great variety of parameters, as for instance the used coaxial cable and grout type, they often are ambiguous, thereby hindering the quantification of the deformation. By the definition of calibrated installation...

... support in mechanical behaviour as well as economical feasibility than rock bolt. Reservoir Characterization strength spiral shape grout shear strength Upstream Oil & Gas resistance shear resistance rock type Artificial Intelligence hard rock rock bolt spiral bolt structural...

... Abstract A modified compaction grouting procedure has been implemented on the Gautrain Rapid Rail in South Africa for viaduct foundations to mitigate against the formation of sinkholes by filling voids in dolomitic soils and karst bedrock. Two full scale trials were carried out at the start...

... Laboratory pull-out tests of cable bolts are conducted using specimens of two types of cables made of plain and bulbed strands installed in steel pipes filled with cement grout. In order to investigate the mechanical behaviors of cable bolts and the mechanism of grout bond failure, the pressure...

... ABSTRACT: When tunnels are constructed in heavily fractured and faulted rock, grouted bolts in combination with shotcrete are frequently used for support. Installation is usually done close to the face, where the rates of displacement are highest. Under unfavourable conditions, the relative...

... ABSTRACT: The bond mechanism of grouted cable bolt support in rock is primarily frictional and dilational and is sensitive to grout quality, rock stiffness and stress changes in the rockmass. A model incorporating these parameters has been developed and calibrated to predict ultimate bond...

... apertures of intersecting joints that includes drilling of cores joints grouted with polyurethane. The grout layer thickness is assumed to represent the in-situ aperture. The thickness variation of the grout layer is measured on sections of a core and analysed statistically. The results so far show...

... As a comment to what was presented before I would like to concentrate on two topics: - Goal of Theory - Practice GOAL OF THEORY It is required to enlighten grouting techniques more than is presently the case because there are many questions open in answering what is going on in the ground...

... ABSTRACT: Grouting is performed since nearly 2 centuries all over the world, but a theory of grouting could not be developed till now. The reasons are not only the heterogeneity of the underground, but mainly the fact that the different flow properties of the water and the grout...