Thermal Damage and Pore Pressure Effects of the Brittle ...

2018-6-26 · We present new mechanical characterization of the Comiso limestone of the Mount Etna Volcano (Italy) basement to constrain the effects of regional ambient conditions associated with the volcanic system: the effects of pore fluid on rock strength and the effects of distal magmatic heating (~20 °C to 600 °C) at a range of simulated depths (0.2 ...

Experimental study of the ultrasonic and mechanical ...

2020-1-1 · The limestone is mainly gray, brittle, and calcareous and features unevenly distributed fractures and oblique fractures. Geological data of XRD-derived mineralogy on powdered samples shows it to be approximately 92–97% calcite, 2–6% dolomite, and 0–1.2% pyrite.

brittle vs. ductile behavior in carbonates (dolomite vs ...

 · RE: brittle vs. ductile behavior in carbonates (dolomite vs. limestone) derubertis (Civil) 20 Jun 00 08:49 A couple of general references you might find helpful are (1) Chapter 4 (Brittle Failure of Rock) by Evert Hoek in Rock Mechanics in Engineering Practice by Stagg and Zienkiewicz and (2) Chapter 8 (Strength) by John Franklin in Rock ...

Formation of spaced cleavage and folds in brittle ...

Under these conditions the deformation was brittle, as indicated by extension veins and by foraminifera that show no measurable distortional strain. Nevertheless, the limestone is often tightly folded; the folding mechanism combined dissolution of limestone along stylolites subparallel to fold axes with deposition of sparry calcite in extension ...

The Brittle-Ductile Transition in Porous Limestone Imaged ...

2017-7-6 · Our observations showed that strain localization may develop at relatively small axial strains of ~1%, in both the brittle faulting and transitional regimes. In Majella limestone (porosity = 31%), the localized deformation involved both shear and compaction. Compaction bands were only observed in less cemented samples of Leitha limestone.

brittle dolomite vs limestone

2021-8-9 · brittle dolomite vs limestone. The theory is that the dolomites are more brittle then the limestone and tectonic events which deform ie ductile behavior the limestone will fracture the dolomite ie brittle behavior creating superK intervals Ive tried a few of the available web sites for civil .

Strength Characteristics of Reef Limestone for Different ...

2019-7-19 · The brittle nature of reef limestone and the difference in the mechanism of point load and uniaxial compression test determine that the uniaxial compressive strength of reef limestone is generally greater than the point load strength. The difference in cementation type has certain impact on the difference between the two strengths, but cannot ...

Chapter 7: Transition from Brittle Fracture to Ductile ...

More than 115 triaxial compression and extension experiments have been performed on the mechanically isotropic, homogeneous Solenhofen limestone to determine the transition from brittle fracture to ductile flow as a function of temperature, confining pressure, and interstitial fluid pressure.

Mechanical behavior of limestone in natural and forced ...

2021-6-5 · For brittle rock materials, the peak AE count usually appears near the peak strength of the limestone specimens. The amplitude of the AE peak count variation is observed to predict the development and breakthrough of the cracks in the rock and to macroscopically predict the formation of a crack on the rock surface.

Micromechanics of brittle faulting and cataclastic flow in ...

2010-8-1 · To investigate both failure modes we deformed samples of Tavel limestone with porosity 10–14% to various stages of deformation in conventional triaxial configuration at confining pressures corresponding to brittle faulting and cataclastic flow and described the microstructures associated with the damage evolution using optical and electron ...

Thermal Damage and Pore Pressure Effects of the Brittle ...

DOI: 10.1029/2017JB015105 Corpus ID: 134641236. Thermal Damage and Pore Pressure Effects of the Brittle‐Ductile Transition in Comiso Limestone @article{Castagna2018ThermalDA, title={Thermal Damage and Pore Pressure Effects of the Brittle‐Ductile Transition in Comiso Limestone}, author={A. Castagna and A. Ougier-simonin and P. Benson and John Browning and R. Walker and M. Fazio and …

(PDF) Brittle and Semi-brittle creep of Tavel limestone ...

2017-6-6 · In this study, the mechanical behavior of a limestone with an initial porosity of 14.7% is investigated at constant stress. At confining pressures below 55 MPa, dilatancy associated with...

Thermal Damage and Pore Pressure Effects on Brittle ...

2018-7-7 · Tavel limestone showed a brittle behaviour up to 55 MPa followed by a semi-brittle behaviour - defined by Evans et al. [1990] as a macroscopically distributed deformation involving micro-cracking and crystal plasticity - over 55 MPa. Water had a relatively small impact on the strength of Tavel limestone (Nicolas et al. [2016]). In

Brittle faulting and cataclastic flow in Tavel limestone ...

And while for sandstone the micromechanics of brittle faulting and cataclastic flow has been studied extensively, little is known about these processes in porous limestones. To fill this gap we deformed Tavel limestone with porosity ranging from 10 to 14% in a conventional triaxial machine at confining pressures 0, 30 and 150 MPa.

Improving the geotechnical properties of high expansive ...

2020-9-11 · By increasing the percentages of limestone powder, the deformation behavior of the treated soils was changed from the ductile behavior to the brittle one. 5. The curing time more than 14 days (i.e., 98 days) has a slight effect on the increase in the values of the UCS and E 50 for all treated soil with adding a wide range of percentages ...

Experimental study of the ultrasonic and mechanical ...

2020-1-1 · The limestone samples used in this experiment were from Lvliang, Shanxi Province in China. These samples were collected from near a fault that passes through a coal mine floor. The limestone is mainly gray, brittle, and calcareous and features unevenly distributed fractures and oblique fractures.

Acoustic Emission During Monotonic and Cyclic …

2012-9-24 · MATION OF A BRITTLE LIMESTONE A. LAVROV1, 2, M. WEVERS3 and A. VERVOORT1 1 Katholieke Universiteit Leuven, Department of Civil Engineering, Leuven, Belgium 2 Moscow State Mining University, Physical and Engineering Department, Moscow, Russia 3 Katholieke Universiteit Leuven, Dept. of Metallurgy and Materials Eng., Leuven, Belgium Abstract

Brittle and semibrittle creep of Tavel limestone deformed ...

Brantut et al. [ 2014] showed that brittle creep was taking place in Purbeck limestone (ϕ = 13.8%, quartz content of 20%). Their experiments were conducted under water‐saturated conditions, enabling mechanisms such as pressure solution and stress corrosion cracking, as discussed in their article.

Tension and shear anchorage systems for limestone ...

2021-2-22 · The lack of strength gain for the T_E_20_10ɸ series may also be explained by its comparison with the brittle failure behaviour that occurred for the T_E_16_10 series (Fig. 10 (d)): while the latter caused the limestone block to unpredictably and violently split, the ɸ20 anchor exhibited a more ductile response instead of an increase in ...

Limestone

Carbonates (limestone and dolomite) share many of the characteristics of sandstone. Resistance to weathering—Because of their crystalline nature, carbonates are ridge formers that produce steep slopes and sharp forms, particularly in arid regions. Dolomite is more brittle than the more plastic limestone.

KGS--Bulletin 209--Greenhorn Limestone of Kansas ...

2010-6-5 · The second submember consists of three hard, brittle, limestone or chalky limestone beds that contain a profusion of Mytiloides labiatus valves and that project from weathered slopes and roadcuts somewhat more prominently than most other beds in …

Brittle-ductile shear zone formation in the McKim ...

The McKim Limestone is part of a regressive, marine sedimentary sequence of strata that was deposited in the Pennsylvanian to Permian periods. It is well-exposed across large portions of Raplee anticline and Comb monocline; a pair of kilometer-scale folds that mark the Monument Upwarp of the Colorado Plateau in southeastern Utah. Two conjugate sets of echelon vein arrays, with complementary ...

Micromechanics of brittle faulting and cataclastic flow in ...

2010-8-1 · Tavel limestone is beige micritic limestone quarried in Tavel, France. Our blocks are considered to be similar to that studied previously by Vincké et al. (1998). The composition is dominated by calcite but a small amount of quartz (<10%) may be present.

Brittle dolomite vs. limestone

2000-6-20 · The theory is that the dolomites are more brittle then the limestone, and tectonic events which deform (i.e., ductile behavior) the limestone will fracture the dolomite (i.e., brittle behavior), creating super-K intervals. I''ve tried a few of the available web sites for civil engineering, but haven''t found any good answers yet.

Types of limestone

2021-8-20 · Limestone contains many sets: the characteristic of this stone is its poor water resistance. Dolomite limestone: this is a rock with better mechanical properties than normal limestone. Silica limestone: This type of limestone is brittle and hard, it has more silicon and has higher strength.

Avoiding Limestone Flooring Issues

Limestone is a brittle rock that can break down and dissolve over time. External factors can cause the stone to crumble, like if it isn''t properly sealed and is then overused. You will want to prevent sealants from wearing away completely by paying attention to …

Micromechanics of brittle faulting and cataclastic flow in ...

Whereas the micromechanics of brittle faulting and cataclastic flow in sandstone has been studied extensively, little is known about these processes in a porous limestone.

Avoiding Limestone Flooring Issues

2021-4-9 · Understanding of the mechanics of the brittle-ductile transition (BDT) in porous limestone is significantly more challenging than for sandstone because of the lack of consistent acoustic emission activity in limestone, meaning that one must rely on alternative techniques.

Mechanical behavior of limestone undergoing brittle ...

With increasing confining pressure, carbonate rocks can undergo the brittle-ductile transition at room temperature. In order to examine the brittle-ductile transition, we performed constant strain rate triaxial deformation and stress-stepping creep experiments on Tavel limestone (porosity 14.7%) under various conditions. The evolution of elastic wave velocities were recorded during each ...

Limestone Staining

2021-8-22 · It will get deep into the pores of your limestone to fully protect it. It is also true that topical stains sit on the surface of the limestone and prevent it from breathing. This can cause the limestone to become cloudy looking but the real danger is that it can cause the stone to become brittle …