A method of integral sampling of rock masses

Rocha, Manuel

doi:10.1007/bf01243548

Cited by 22 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recovery of drilled core tends to be much better in blocks than in matrix because the blocks survive the drilling process, whereas the weak matrix generally does not (Riedmüller et al, 2001). Good core recovery has been reported by using triple-tube core barrels (Roadifer et al, 2009), and the Integral Method (Rocha, 1971). Downhole optical and geophysical techniques (such as borehole televiewers) provide rock mass information of the walls of the drilled holes, and are particularly useful when core recovery is poor.…”

Section: Geopractice Methods For Characterization Of Mélangesmentioning

confidence: 99%

Geopractitioner approaches to working with antisocial mélanges

Medley¹,

Zekkos²

2011

Mélanges: Processes of Formation and Societal Significance

View full text Add to dashboard Cite

Although mélanges are exciting, puzzling, and controversial to geologists, it is geopractitioners and contractors who must work with them to engineer the constructed works of Society. Geopractitioners include geotechnical engineers, geological engineers, engineering geologists, and rock engineers. Mélanges are the most intractable bimrocks (block-in-matrix rocks), complex geological mixtures composed of hard blocks of rocks surrounded by weaker matrix, and are famously exemplifi ed by those within the Franciscan Complex of Northern California. Bimrocks also include olistostromes, weathered rocks, fault rocks, and lahars. The conventional characterization, design, and construction procedures used by geopractitioners for well-behaved stratifi ed rocks and soils are not well suited to mélanges. The considerable engineering and construction diffi culties related to mélanges burden Society to the extent that they can be considered "antisocial." Case histories exemplify a recommended systematic procedure for characterization, design, and construction with mélanges. Geopractitioner approaches to characterizing California's chaotic Franciscan mélanges are applicable to geologists and geopractitioners working in fault zones, weathered rocks, lahars, and other bimrocks, and suggestions are offered for collaborative research between geologists and geopractitioners.

show abstract

Section: Geopractice Methods For Characterization Of Mélangesmentioning

confidence: 99%

Geopractitioner approaches to working with antisocial mélanges

Medley¹,

Zekkos²

2011

Mélanges: Processes of Formation and Societal Significance

View full text Add to dashboard Cite

show abstract

“…Percolation of pore fluids has major effects on the stability, and subsurface flow regimes can be complex. In addition, natural events, such as rainfall and earthquakes, and manmade factors, such as blasting, can serve as triggers to slope instabilities (Hoek et al 2005;Singh and Goel 2011;Bronniman 2011;Miranda and Sousa 2012;Rocha 2013;Sanei et al 2015;Karam et al 2015;Sousa et al 2020). Rock mass strength parameters can be determined by in-situ and laboratory tests.…”

Section: Introductionmentioning

confidence: 99%

“…The in-situ tests are shearing along discontinuities, in fault filling materials and along other low strength surfaces. Laboratory tests for intact rocks and for discontinuities are very important (Rocha, 2013;Hencher and Richards 2015;Sousa et al, 2020). Empirical systems provide guidelines to estimate rock strength parameters in slopes.…”

Section: Introductionmentioning

confidence: 99%

Risk Analysis Management of Volcanic Slopes in São Miguel Island, Azores

Fernandez,

Oliveira,

Vargas

et al. 2024

Preprint

View full text Add to dashboard Cite

The Azores Archipelago is affected by several geohazards and natural disasters, including earthquakes, volcanic eruptions, and extreme meteorological events. This makes this region quite susceptible to landslides. To ensure the safety of natural slopes, it is vital to systematically assess and manage risk to propose measures to reduce the geotechnical risk of slope instability. Volcanic formations are unique in that they typically exhibit sizeable natural variability of lithological formations and heterogeneities, with significant variations in geometry. Therefore, the existing standard characterisation systems do not consider the heterogeneous nature and unique characteristics of volcanic formations. The instability of a slope was selected for the analysis in Porto Formoso. The hill is located on the north coast of the island of S. Miguel, in the Azores archipelago. From a geological point of view, the slope consists of a volcanic rocky mass of a trachytic nature, which is covered superiorly by an incoherent deposit of a pomitic nature. A 3D numerical model using the Material Point Method (MPM) was developed and applied to the site, including seismic action considering the Portuguese regulations. A slope risk analysis was analyzed, considering the MPM numerical results. Finally, conclusions are drawn.

show abstract

“…The study of claystone has been extensively conducted by numerous scholars since the 1970s. Typically, these materials, known as hard soil and soft rock, are classified based on their uniaxial compressive strength [1][2][3]. A large number of field investigations, geotechnical tests, and engineering construction practices have consistently demonstrated that hard soil and soft rock exhibit characteristics such as expansion and contraction, multiple fractures, and overconsolidation.…”

Section: Introductionmentioning

confidence: 99%

Macro- and Micro-Characteristics and Mechanical Properties of Xigeda Formation Claystone in Luding County, Western Sichuan, China

Wu,

Li,

Guo

et al. 2023

Sustainability

View full text Add to dashboard Cite

Claystone is actually a type of hard soil or soft rock. To reveal the engineering geological characteristics of the Xigeda formation claystone in Luding County (Western Sichuan, China), some experiments, including X-ray diffraction (XRD), scanning electron microscopy (SEM), and geotechnical tests, are performed. The testing results indicate that the Xigeda formation claystone primarily consists of silt, clay, and other fine-grained materials. It is characterized by interbedded yellow and gray thin layers with a horizontal lamination structure. The yellow and gray claystones are made of the same materials but differ in their proportions. Additionally, yellow claystone is characterized by a higher density, resulting in enhanced cementation among clay particles. The permeability coefficient of Xigeda formation claystones ranges from 3.62 × 10−4~7.34 × 10−4 cm/s. The cohesion of yellow and gray claystones decreases with increasing moisture content, and the decline is greater at higher moisture contents. However, the relationship between internal friction angle and moisture content is different. The mechanical properties of the Xigeda formation exhibit significant differences in sensitivity to changes in moisture content across various regions. Notably, the claystone within the study region experiences a particularly pronounced weakening of its mechanical properties when exposed to water.

show abstract

A method of integral sampling of rock masses

Cited by 22 publications

References 0 publications

Geopractitioner approaches to working with antisocial mélanges

Geopractitioner approaches to working with antisocial mélanges

Risk Analysis Management of Volcanic Slopes in São Miguel Island, Azores

Macro- and Micro-Characteristics and Mechanical Properties of Xigeda Formation Claystone in Luding County, Western Sichuan, China

Contact Info

Product

Resources

About