A new numerical approach to weathering and alteration in rock using a pilot area in the Tuzla geothermal area, Turkey

Bozkurtoğlu, Erkan; Vardar, Mahir; Suner, Fikret; Zambak, Caner

doi:10.1016/j.enggeo.2006.06.002

Cited by 21 publications

(6 citation statements)

References 11 publications

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“…Visually, the slightly weathered sample has a darker colour compared with the fresh one, and there are a few weathering fissures in it. In Table 1, we can see that the dry density and specific gravity of these two rocks are quite close, indicating the weathering extent is moderate (Bozkurtoglu et al, 2006), and the cement structures of these two materials are basically unchanged. The most important difference between the fresh samples and the slightly weathered ones is the difference in porosity (see Table 1), which has important influences on the mechanical behaviour of the samples, as will be shown in the following.…”

Section: Description Of Materials and Testing Resultsmentioning

confidence: 95%

A micromechanics-based elastoplastic damage model for quasi-brittle rocks

Xie

Zhu

et al. 2011

Computers and Geotechnics

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International audienceThis paper presents a micromechanics-based elastoplastic damage model for quasi-brittle rocks under a compressive stress state. The plastic strain is considered to be related to frictional sliding along micro-cracks, and it is coupled inherently with damage evolution. By following a homogenization procedure, we determine the free energy of the matrix-cracks system. The thermodynamic force associated with the inelastic strain contains a back stress, which controls material hardening. Next, in order to determine plastic flow and crack propagation, we propose a Coulomb-type friction criterion, which is used as the plastic yielding function, and a damage criterion based on strain energy release rate. These thermodynamic formulations with a micro-macro scale change allow reducing significantly the number of model parameters, as compared to phenomenological models. Our model is applied to simulate triaxial compression tests on two sets of diabase samples. The first sample set is cored from a fresh diabase rock mass, and the second from a slightly weathered one. Comparisons between numerical predictions and test data are presented

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Section: Description Of Materials and Testing Resultsmentioning

confidence: 95%

A micromechanics-based elastoplastic damage model for quasi-brittle rocks

Xie

Zhu

et al. 2011

Computers and Geotechnics

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“…Under the action of thermal water, physical and mechanical properties of rocks change widely. Many publications reveal that alteration processes generally result in mechanically weaker rock (Potro and Hürlimann, 2009;Rigopoulos et al, 2010;Coggan et al, 2013) while some other studies propose more variable property changes (Sigurdsson et al, 2000;Bozkurtoğlu et al, 2006;Lutz et al, 2011;Siratovich et al, 2012;Wyering et al, 2012). Our previous studies have shown that these changes depend on a number of factors including parent rocks, РТ-conditions, composition and type of fluid, and duration of fluid-rock interaction (Frolova et al, 1999(Frolova et al, , 2010(Frolova et al, , 2011.…”

Section: Introductionmentioning

confidence: 96%

Effects of hydrothermal alterations on physical and mechanical properties of rocks in the Kuril–Kamchatka island arc

Frolova

Vladimir

Sergey

et al. 2014

Engineering Geology

105

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“…The presence of metals in water results from two independent factors. The first involving the weathering of soils and rocks [ 1 – 3 ] with its products being transported by air [ 4 , 5 ] and water [ 6 ], and the second involving a variety of anthropogenic activities that have created a societal health risk in rivers that receive a substantial amount of waste, as it is the case of the Rio San Pedro. In diverse aquatic environments within the state of Chihuahua, Mexico, the evidence of contamination points to anthropogenic activities [ 7 – 9 ].…”

Section: Introductionmentioning

confidence: 99%

Heavy metals in water of the San Pedro River in Chihuahua, Mexico and its potential health risk

Gutiérrez

Rubio-Arias

Quintana

et al. 2008

IJERPH

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The objective of this study was to determine the seasonal and downstream water quality variations of the San Pedro River in Chihuahua, Mexico. Water samples were collected monthly from October 2005 to August 2006 in triplicate, totaling 165 water samples. The five sampling locations were: below the Francisco I. Madero dam (LP); between Rosales and Delicias (RD); Meoqui (M); El Torreon (ET), and Julimes (LJ). The levels of As, Be, Ca, Cd, Co, Cu, Cr, Fe, Li, Mg, Mn, Mo, Ni, Pb, Sb, Se, Sr, Ti, Ta, V and Zn were measured using an Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES) Perkin Elmer 2100. In addition, temperature, pH, electrical conductivity and total and fecal coliformes were determined. The statistical analysis considered a factorial treatment design; where factor A was the location point and factor B was sampling date. In addition, a multivariate technique looking for principal components was performed. The results indicated that some samples exceeded Mexican standards for As, Be, Ca, Cd, Co, Cr, Fe, Mn, Ni, Pb, Sb, Se, Sr and Zn. The As level must be considered for a red flag to the communities along the Rio San Pedro because both the monthly average level (0.10 mg L−1) and location (0.10 mg L−1) exceeded the Mexican and International norms. The multivariate analysis showed a predominant aggregation at the LP location, meaning that there was a predominance of As, Sr, Fe and Li. At the rest of the locations the elements did not present a tendency for aggregation. Statistics applied to sampling month showed that December, January, March and April were aggregated in a negative quadrant of component 1 indicating a predominance of V, Ni, Be, Fe and As. Overall, the results confirmed that this stretch of the San Pedro River is contaminated with heavy metals and other contaminants that might affect human health as well as the health of the ecosystem.

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A new numerical approach to weathering and alteration in rock using a pilot area in the Tuzla geothermal area, Turkey

Cited by 21 publications

References 11 publications

A micromechanics-based elastoplastic damage model for quasi-brittle rocks

A micromechanics-based elastoplastic damage model for quasi-brittle rocks

Effects of hydrothermal alterations on physical and mechanical properties of rocks in the Kuril–Kamchatka island arc

Heavy metals in water of the San Pedro River in Chihuahua, Mexico and its potential health risk

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