Figure F12. The T2P penetrometer is being co-developed at MIT, Pennsylvania State University, and IODP-TAMU. It is designed to measure pore pressure and hydraulic conductivity in mudstones. The plot illustrates the dissipation at both the tip and the shaft after penetration in a December 2004 land deployment in Boston Blue Clay in Newburyport, Massachusetts (USA).Excess pore pressure ratio = (u – u_h)/(u_i –u_h). u = pore pressure, u_h = hydrostatic pressure, u_i = peak insertion pressure.

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