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Battle Mountain Resources, Inc. <br />' 06 July 1993 <br />Page 4 <br />' local friction (Fs), friction ratio (Rf), and inclination <br />(In) was obtained. The data was available for immediate <br />evaluation via a computer system onboard the track unit. The <br />' data was also stored on magnetic media for future processing. <br />Some of the more useful properties and parameters that can be <br />obtained from cone penetrometer data include: <br />Tailings stratigraphy <br />• Undrained shear strength <br />' Compressibility <br />Over-consolidation ratio (OCR) <br />• Correlation to N-value from standard penetration tests <br />' Relative density <br />Liquefaction potential <br />In addition to the above, the piezocone was used to obtain <br />pore water pressure measurements. <br />Piezocone testing has many advantages over the conventional <br />' cone penetrometer test. The main advantages include: <br />a. the ability to distinguish between drained, partially <br />' drained, and undrained penetration; <br />b. the ability to correct measured cone data to account for <br />unbalanced water forces due to unequal end areas in cone <br />' design; <br />c. the ability to evaluate flow and consolidation char- <br />, acteristics of the tailings; <br />d. the ability to assess equilibrium ground water <br />conditions; and <br />' e. improved tailings profiling and identification with <br />improved evaluation of geotechnical parameters. <br />' There is significant importance as to the placement of the <br />pore pressure element during a piezocone penetration test. <br />' Pore pressures can be generated in saturated tailings due to <br />changes in both mean normal stresses and shear strbsses. <br />When saturated tailings are subjected to increases in mean <br />normal stresses, positive pore pressures are generated. When <br />' saturated tailings are subjected to only shear stresses, pore <br />pressures generated can be either positive or negative <br />depending on the contractive or dilative response of the <br />tailings. During penetration testing, tailings pariticles <br />adjacent to the cone experience changes in both normal <br />and shear stresses. Pore pressures measured on the face of <br />a penetrating cone are influenced by both normal and shear <br />' stresses, whereas, pore pressures measured behind the tip <br />' TERRA TECHNOLOGIES -SOUTHWEST, INC. <br />