Dynamic failure of dry and fully saturated limestone samples based on incubation time concept

Petrov, Yu. V.; Smirnov, Ivan; Volkov, G. A.; Abramian, A. K.; Bragov, A. M.; Verichev, Stanislav

doi:10.1016/j.jrmge.2016.09.004

Cited by 60 publications

(22 citation statements)

References 24 publications

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“…Известно, что присутствующая в порах этих материалов вода или водный раствор способны оказывать значительное влияние на их механические свойства. В частности, поровая жидкость полагается ответственной за многочисленные явления преждевременного разрушения вмещающего материала при нагрузках, существенно меньших, чем предельно допустимые для этих же материалов, не насыщенных жидкостью [1][2][3][4][5].…”

Section: Introductionunclassified

The Numerical study of the influence of a two-scale pore structure on the dynamic strength of water-saturated concrete

Konovalenko

Сергеевич²,

Shilko

et al. 2020

PNRPU Mechanics Bulletin

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Many infrastructural concrete facilities, such as dams, bridge footings, foundations of port facilities and offshore drilling platforms, operate in a permanent contact with water. The permeable fractured-porous structure of concrete determines the water-saturated state of the surface layers of such concrete elements. Under dynamic contact loading, the pore fluid is capable of exerting a significant mechanical influence on the local stress-strain state and strength characteristics of the surface layers of concrete. This has to be taken into account when assessing the wear intensity of surface layers and predicting a concrete element’s service life. The aforesaid determines the relevance of the study aimed at identifying the influence of the pore fluid and characteristics of the concrete pore structure on the strength and fracture pattern under quasistatic and dynamic compressive loading. The present work is devoted to the theoretical study and generalization of the laws of mechanical influence of the pore fluid on the dynamic strength of high-strength concrete with a two-scale pore structure. The emphasis in the study is on analyzing the contributions of each of the pore subsystems to the integral mechanical effect of the fluid. To carry out such an analysis, a coupled hydromechanical model is developed. It takes into account the compositional structure of concrete, the presence of a pore space in a cement stone of two different scales, the interaction of a pore liquid and a solid-phase skeleton based on the Bio poroelasticity model, as well as fluid filtration in a pore space. By using the developed model were performed the numerical studies of the dependence between the compressive strength of the representative concrete volumes of the mesoscopic scale on the strain rate, the sample size, the pore fluid viscosity, and pore structure parameters. The simulation results showed the possibility of combining the obtained dependencies into a generalized (master) curve in terms of a combined dimensionless parameter, which has the meaning similar to the Darcy number. We identified two key factors that control the type and parameters of the concrete master curve of the dynamic strength. The first factor is the mobility of the pore fluid in the network of the capillary pores. It determines the rate of stress equalization in the porous skeleton due to fluid flow. The second factor is the interconnection of large micropores with the network of the small capillary pore channels. It determines the magnitude of the decrease in stress concentration in micropores by filtering the excess pore fluid into the capillary pore network. It is shown that the contributions of these two factors to the amplitude of variation of the dynamic strength of the water-saturated concrete are additive, and their total contribution reaches 25 %.

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Section: Introductionunclassified

The Numerical study of the influence of a two-scale pore structure on the dynamic strength of water-saturated concrete

Konovalenko

Сергеевич²,

Shilko

et al. 2020

PNRPU Mechanics Bulletin

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“…Saturated coal specimens have higher indirect tensile strength than dry ones. Petrov et al [12] discovered that the temporal dependence of the dynamic compressive and split tensile strengths of dry and saturated limestone samples can be predicted by the incubation time criterion. e results showed that the peak strength of specimens decreases with increasing water content.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Dynamic Impact Mechanical Characteristics of Prestressed Saturated Fractured Coal and Rock

Wen

Zhang

et al. 2019

Advances in Civil Engineering

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e natural and water-saturated states of coal samples under static and static-dynamic loads were tested using the Split-Hopkinson pressure bar (SHPB) method and RMT-150 system, respectively. e differences in the strength reduction coefficient and elastic modulus reduction coefficient of water-saturated coal samples under static and static-dynamic loads were discussed. e experimental results for coal were compared with the corresponding characteristics of typical sandstone samples under static and static-dynamic loads. Furthermore, a fracture model of a hydrous wing branch fracture under static-dynamic loading was established based on the theory of fracture damage mechanics. e difference in dynamic strength between coal and sandstone samples for both the natural state and water-saturated state was analyzed. On this basis, the effect of water on the fracture surface of coal and the tensile strength and shear strength of the branch fracture surface were fully considered. In addition, criteria of the branch fracture surface for crack initiation and crack arrest were also established. Finally, the phenomenon of increasing elastic modulus in saturated coal samples was explained with this criterion.

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“…Published strength data for limestone, summarized in Table 9 [58][59][60][61][62][63][64][65], indicates that:…”

Section: Dynamicsmentioning

confidence: 99%

“…(1) Limestone is strongest in compression, with strength values one to two orders of magnitude higher than in shear or tension. The dynamic compressive strength is even greater, increasing linearly with impact load [60,65] (2) The static and dynamic shear strength of limestone are of similar magnitude, with the dynamic strength exceeding static values by no more than 25% [61] (3) The dynamic and static tensile strength of limestone are roughly equivalent [62] (4) As expected, the shear strength of limestone discontinuities is very low, roughly one to two orders of magnitude below that of intact rock [58] In summary, the relative dynamic strength measures for limestone rank as follows:…”

Section: Dynamicsmentioning

confidence: 99%

The Eureka Valley Landslide: Evidence of a Dual Failure Mechanism for a Long-Runout Landslide

Shaller¹,

Doroudian²,

Hart³

2020

Lithosphere

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Long-runout landslides are well-known and notorious geologic hazards in many mountainous parts of the world. Commonly encompassing enormous volumes of debris, these rapid mass movements place populations at risk through both direct impacts and indirect hazards, such as downstream flooding. Despite their evident risks, the mechanics of these large-scale landslides remain both enigmatic and controversial. In this work, we illuminate the inner workings of one exceptionally well-exposed and well-preserved long-runout landslide of late Pleistocene age located in Eureka Valley, east-central California, Death Valley National Park. The landslide originated in the detachment of more than 5 million m3 of Cambrian bedrock from a rugged northwest-facing outcrop in the northern Last Chance Range. Its relatively compact scale, well-preserved morphology, varied lithologic composition, and strategic dissection by erosional processes render it an exceptional laboratory for the study of the long-runout phenomenon in a dry environment. The landslide in Eureka Valley resembles, in miniature, morphologically similar “Blackhawk-like” landslides on Earth, Mars, and minor planet Ceres, including the well-known but much larger Blackhawk landslide of southern California. Like these other landslides, the landslide in Eureka Valley consists of a lobate, distally raised main lobe bounded by raised lateral levees. Like other terrestrial examples, it is principally composed of pervasively fractured, clast-supported breccia. Based on the geologic characteristics of the landslide and its inferred kinematics, a two-part emplacement mechanism is advanced: (1) a clast-breakage mechanism (cataclasis) active in the bedrock canyon areas and (2) sliding on a substrate of saturated sediments encountered and liquefied by the main lobe of the landslide as it exited the main source canyon. Mechanisms previously hypothesized to explain the high-speed runout and morphology of the landslide and its Blackhawk-like analogs are demonstrably inconsistent with the geology, geomorphology, and mineralogy of the subject deposit and its depositional environment.

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Dynamic failure of dry and fully saturated limestone samples based on incubation time concept

Cited by 60 publications

References 24 publications

The Numerical study of the influence of a two-scale pore structure on the dynamic strength of water-saturated concrete

The Numerical study of the influence of a two-scale pore structure on the dynamic strength of water-saturated concrete

Analysis of the Dynamic Impact Mechanical Characteristics of Prestressed Saturated Fractured Coal and Rock

The Eureka Valley Landslide: Evidence of a Dual Failure Mechanism for a Long-Runout Landslide

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