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. 2016 Apr 26;6:24852. doi: 10.1038/srep24852

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(a-b) vs. pore fluid pressure. Evolution of the (a-b) friction parameter as a function of the effective normal stress, σ’_n, and pore fluid factor λ. Marble gouge at 19 MPa (a) and 30 MPa (b) of confining pressure, P_c. Limestone gouge at 19 MPa (c) of confining pressure.