Influence of water content and anisotropy on the strength and deformability of low porosity meta-sedimentary rocks under triaxial compression

Li, Diyuan; Wong, Louis Ngai Yuen; Liu, Gang; Zhang, Xiaoping

doi:10.1016/j.enggeo.2011.12.009

Cited by 180 publications

(72 citation statements)

References 30 publications

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“…Water is another important factor affecting the Brazilian tensile strength (Li et al, 2012;Yilmaz, 2010). The tensile strength of a sample dropped to nearly half of its dry value after it was soaked in water for one week, and decreased further only slightly after the specimen was immersed in water for three weeks or ten weeks.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study On The Effect Of Micro-Cracks On Brazilian Tensile Strength

Wang¹

2015

Archives of Mining Sciences

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For coal mine ground control issues, it is necessary to propose a failure criteria accounting for the transversely isotropic behaviors of rocks. Hence, it is very helpful to provide experimental data for the validation of the failure criteria. In this paper, the method for preparing transversely isotropic specimens and the scheme of the Brazilian tensile strength test are presented. Results obtained from Brazilian split tests under dry and water-saturated conditions reflect the effect of the development direction β of the structural plane, such as the bedding fissure, on the tensile strength, ultimate displacement, failure mode, and the whole splitting process. The results show that the tensile strength decreases linearly with increasing β. The softening coefficient of the tensile strength shows a sinusoidal function. The values of the slope and inflection point for the curve vary at the different stages of the Brazilian test. The failure mode of the rock specimen presented in this paper generally coincides with the standard Brazilian splitting failure mode. Based on the test results, the major influencing factors for the Brazilian splitting strength are analyzed and a mathematical model for solving the Brazilian splitting strength is proposed. The findings in this paper would greatly benefit the coal mine ground control studies when the surrounding rocks of interest show severe transversely isotropic behaviors.Keywords: Brazilian split test; Dry and water saturation; Bedding fissure; Strength coefficient; Coal mine ground control W związku z zagadnieniami ochrony powierzchni w kopalniach węgla, konieczne jest opracowanie odpowiednich kryteriów klasyfikacji uszkodzeń skał uwzględniających ich poprzeczną izotropowość. Pomocnym jest także dostarczenie danych eksperymentalnych niezbędnych do walidacji kryteriów uszkodzeń. W pracy tej zaproponowano metodę przygotowywania próbek wykazujących izotropowość poprzeczną, omówiono także sposób przeprowadzania testu na rozciąganie metodą brazylijską. Wyniki testu uzyskane na sucho oraz w warunkach nasycenia próbki wodą wskazują wpływ kierunku rozwoju β płaszczyzny strukturalnej (np. płaszczyzn spękań) na wytrzymałość próbki na rozciąganie, maksymalne przemieszczenia, rodzaj uszkodzenia oraz przebieg procesu pękania. Wyniki testu wskazują, że wytrzymałość na rozciąganie maleje liniowo wraz ze wzrostem wartości β. Współczynnik mięknienia próbki w trakcie próby wytrzymałościowej na rozciąganie ma przebieg krzywej sinusoidalnej. Wartości kąta nachylenia oraz punkt przegięcia krzywej różnią się dla poszczególnych etapów próby wytrzymałościowej. Tryb uszkodzeń próbek skalnych przedstawiony w artykule zasadniczo pozostaje w zgodzie z typowymi odkształceniami rejestrowanymi w trakcie testu metodą brazylijską. W oparciu o wyniki eksperymentu, przeanalizowano główne czynniki wpływające na wytrzymałość próbek na rozciąganie i zaproponowano odpowiedni model matematyczny do obliczania wytrzymałości. Wyniki przedstawione w artykule stanowią poważny przyczynek do badań stabilności gruntu...

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Section: Introductionmentioning

confidence: 99%

Experimental Study On The Effect Of Micro-Cracks On Brazilian Tensile Strength

Wang¹

2015

Archives of Mining Sciences

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“…Moisture absorption can partly form a water film on the surface of granite aggregate, which can seriously affect adsorption effect and the adhesion strength between the aggregate and resin matrix (see Fig.2). The curing process of epoxy resin is an exothermic reaction [17][18][19][20][21], water in granite aggregate turns into steam with the rise of temperature [15] [17]. Water vapor can adhere to the interface between aggregate and resin that it is difficult to remove in the process of vibration molding.…”

Section: Effects Of Aggregate Moisture Content On the Interface Betwementioning

confidence: 99%

“…Granite aggregate moisture can weaken the adhesion strength of inside material, and reduce the uniaxial compressive strength of the aggregate. The relationship between water content and uniaxial compressive strength [18] [23] [24] could be described by an exponential equation. …”

Section: Effects Of Aggregate Moisture Content On the Mechanical Strementioning

confidence: 99%

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Influence of Aggregate Moisture Content on the Mechanical Properties of Resin Mineral Composite

Yin¹,

Zhang²,

Zhang³

et al. 2015

Proceedings of the International Conference on Chemical, Material and Food Engineering

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INTRODUCTIONMachine tool bed plays an important role in the manufacturing industry, which could provide mechanical products of better precision and surface quality. However, vibration generated in the machining process has much more influence on the dimensional precision and surface quality of the workpiece, which prohibits high-speed and high-precision machining from developing rapidly. How to minimize vibration during the manufacturing process is now an important factor that affects machining precision and the stability of machine tool [1] [2].Resin mineral composite (RMC) is a composite material similar to plain concrete that it is composed of granite particles as solid aggregate. The difference is that the binder is organic resin. With the development of high-speed and high-precision machining technology, RMC has attracted more and more attention for its good vibration alleviating properties [3]. Compared with gray cast iron and welded steel, RMC has ten times the damping ratio that it can better absorb vibrations generated in the machining process, especially in high-speed and high-precision machining processes [2] [4]. However, the application of RMC is restricted by its limitation in mechanical strength, and considerable research should be done to improve its mechanical properties in order to satisfy the requirements of high-speed and high-precision machining.The mechanical strength of fully cured RMC is highly related to its components and the interface between the resin matrix and filler [5] on the mechanical strength of RMC. However, little information has been focused on the influences of aggregate moisture content on the mechanical strength of RMC. As the key component in RMC to bear loads, the aggregate weight of the total composite material accounts for more than 85%, the physical and chemical properties of the aggregate has a significant impact on the mechanical properties of RMC [5]. Influence of aggregate moisture content on the mechanical strength of RMC was not received sufficient attention. Fontana and Reams [14] revealed that 3% of pre-existing water in aggregates reduces the compressive strength of the PC by half. Header and Mohammad [15] found that the polymer concrete's flexural strength decreased from 25.8 MPato 0.68 MPa and compressive strength from 190MPa to 85 MPa when the initial moisture added to the aggregate content increased from 0% to 5%. However, data is still scarce. We need to provide more documents. In this International Conference on Chemical, Material and Food Engineering (CMFE-2015)

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“…The strength of a wet specimen is lower than that of a dry one 1,3,[7][8][9][10] and the tensile strength of rocks under saturated conditions is lower than that under dry conditions 11,12 . The influence of water on deformability of rocks is reflected as a reduction of Young's modulus and an increase of Poisson's ratio 3,7,13,14 . The best relations between uniaxial compressive strength and elastic modulus with water content are found to be exponential functions 5,6,9,14 .…”

Section: Introductionmentioning

confidence: 99%

Pore pressure effects on strength and elasticity of ornamental stones

Khamrat¹,

Archeeploha²,

Fuenkajorn³

2016

ScienceAsia

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This experimental study determines the effects of pore pressure on the compressive strengths and elasticity of six ornamental stones. An approach to determine the pore pressure in low porosity rocks is presented. Rectangular rock specimens (50 × 50 × 100 mm 3 ) under dry and wet conditions were axially loaded under different rates from 0.001-10 MPa/s using a polyaxial load frame. The confining pressures ranged from 0 to 12 MPa. Wet granite, marl, marble, Phra Wihan sandstone, Phu Phan sandstone, and siltstone specimens have an average water content of 0.14%, 2.7%, 0.09%, 2.05%, 4.9%, and 1.5%, respectively. Compressive shear failure was observed in specimens under slow loading rate while extension failure was found in specimens under high loading rate. The strength values of the wet specimens were lower than those of the dry ones, particularly under the high confining pressure and loading rates.The strength values obtained from the dry testing were used to quantitatively calibrate the loading rate effect from the wet strengths, and hence the effect of pore pressure could be calculated. The pore pressures notably reduced the compressive strength and elastic modulus, and slightly increased Poisson's ratio of the rocks tested.

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Influence of water content and anisotropy on the strength and deformability of low porosity meta-sedimentary rocks under triaxial compression

Cited by 180 publications

References 30 publications

Experimental Study On The Effect Of Micro-Cracks On Brazilian Tensile Strength

Experimental Study On The Effect Of Micro-Cracks On Brazilian Tensile Strength

Influence of Aggregate Moisture Content on the Mechanical Properties of Resin Mineral Composite

Pore pressure effects on strength and elasticity of ornamental stones

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