... analysed in order to estimate the strength and deformability properties of rock mass. rail transportation strength gallery France boulou fault site characterisation perthus tunnel Reservoir Characterization instrumentation programme borehole investigation myllonite weaker zone rock mass...

... of HackÕs (1998) SSPC system which places less influence on rock quality designation and unconfined compressive strength than previous rock mass rating systems. The Hack weathering susceptibility rating has been modified by using chemical index of alteration values from XRF major element analysis. Another...

... of the rock arches above these old mine workings and man-made voids. The modelling has been calibrated against results of a full-scale destructive test of a cavity roof under applied load; initial strength parameters of the sandstone were derived from laboratory testing. Physical modelling of the cavities has...

... permeability tests, including rising and falling head tests in piezometers with screens in the sands and clays, and packer tests in the shale/laminite. reservoir geomechanics strength hydraulic conductivity water table Reservoir Characterization basement level geotechnical monitoring Upstream Oil...

... ABSTRUCT: Estimation of the cohesion in shear strength under unsaturated state is an important problem when stability analysis is undertook for some natural slopes. In this paper, one simple method to estimate the cohesion is proposed. This method is based on the unconfined compression test...

...FACTORS INFLUENCING SHEAR STRENGTH AND SLOPE FAILURES IN BASALT SOILS OF NORTH EASTERN NEW SOUTH WALES Steven R Morton1 ABSTRACT Landslides are a common feature of the basalt terrain or north eastern New South Wales. Failures typically occur through residual soil layers, at strength between...

... earth falls and shallow slips can occur during rainfall due to saturation and loss of strength with time. At steep benches (> 55o) exposing Zone II with day-lighting relict discontinuity planes, wedge failures can occur due to saturation and low shear strengths. During periods of intense...

... ABSTRACT: For preliminary assessment of sites in jointed rock masses the expensive and time consuming field investigations are neither desirable nor feasible for all the sites. The rock mass classifications can help reduce burden of these investigations by indicating the range of strength...

... expansive rock areas in Nanning-Kunming railway. It is forced to use this material to fill embankments. But the strength of the expansive rock is low, the average cohesion of triaxial shear test is 32.3 kpa, and inner friction angle is 8.1°with high swelling potential, the expansive rocks have a free...

... alteration of olivine, pyroxene, plagioclase and natural glass. Some zeolites also are capable of swelling. The swelling pressures which developed within the basalts when expansive clay minerals took up water could exceed the tensile strength of the rock and therefore led to its breakdown. Whether...

... rail transportation Reservoir Characterization structural geology tunnel envelope ground condition strength subsurface condition mountain Upstream Oil & Gas groundwater level sandstone ground transportation Piezometer hydraulic conductivity Los Angeles alignment excavation...

... – is investigated experimentally. Theoretical and experimental studies on stress development during ground freezing operations for tunnelling projects are financed by the Project Organisation HSL-Zuid. ARTIFICIAL GROUND FREEZING AND STRESS DEVELOPMENT Artificial ground freezing enhances the strength of soil...

... strength mechanism tunnel face macroscopic strength criterion homogeneous material criterion limit load reinforcement contribution geometry design theory bolt reinforcement homogenization approach failure mechanism stability analysis optimization cohesive-frictional soil...

... is illustrated in Figure 1. metals & mining strength reservoir geomechanics span stability Reservoir Characterization Upstream Oil & Gas knowledge management data mining coal roof fall highwall mining operation panel collapse stability seam Duncan Fama pillar continuous miner...

... strength steel requirement shotcrete tunnel lining metals & mining shotcrete lining lining soft lining Thickness ductility excavation construction materials deformation stiffness tunnel relative stiffness soft ground tunnel lining tunnel lining design ABSTRACT...

..., this paper confirms a well known fact that interaction between mineral fragments and fluids represents the most important factor which controls decrease of soil shear strength. In extreme cases, the shear strength can be reduced to approximately a half or even a third and that may result in disastrous...

... in rock is subject to considerable uncertainty. Although general geological information supplemented by limited borehole cores is usually available in advance of excavation, the ground exposed at the face can differ considerably from that anticipated, especially with respect to deformability and strength...

... through an integrated data-base. The authors studied the relations between RMR value and the rock mass properties such as unit weight, deformation modulus, uniaxial compressive strength, friction angle, elastic wave velocity. Several direct empirical relations between the properties and RMR value...

..., these approaches lack systematic analysis and evaluation on their effect against squeezing ground. The performances of these tunneling methods still need to be investigated in detail. Rock Deformation conventional shotcrete Excavation Sequence strength numerical analysis shotcrete pilot method tunnel...

... of coarse grained sands and gravels. Although the weights of these overlying materials are currently taken into account when assessing tunnel stability, the contribution of their strength and stiffness on tunnel stability is difficult to quantify. Centrifuge model testing has proven to be a very powerful...