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Effects of loadinge-unloading and wettinge-drying cycles on geomechanical behaviors of mudrocks in the Colombian Andes

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Journal of Rock Mechanics and Geotechnical Engineering 2014年第3期6卷 257-268页

作者： Mario Camilo Torres-Suarez adolfo alarcon-guzman Rafael Berdugo-De Moya National University of Colombia North University Barranquilla Colombia

The mudrocks in the Colombian Andes, particularly those exhibiting low cementation （bonding）, are susceptible to degradation when the environmental conditions change, which are challenging issues for engineering works. In this paper, the changes in physico-mechanical properties of mudrocks were moni- tored in laboratory, and some influential factors on the mechanical competence of geomaterials were studied. The geotechnical characteristics and experimental designs were developed from physical, chem- ical, mechanical and compositional points of view. In the tests, the techniques such as vapor equilibrium technique （VET） were employed to apply wetting-drying cycles and to control relative humidity （suction- controlled） and loading-unloading cycles through ultrasonic wave velocities technique. The results show that the main failure mechanisms for the laminated mudrocks start on the microscopic scale by fissures coalescence, exhibiting physico-chemical degradation as well; the global geomechanical behavior presents a state between a ductile, like rock, and a fragile, like soil. The obtained results can provide engineering values according to monitoring laboratory set, when compared with in situ conditions.

关键词： MudrocksDegradation processesSuction changesStress-strain behaviorVapor equilibrium technique (VET)

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On a Generalized Model in Accelerated Life Testing

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Open Journal of Statistics 2012年第2期2卷 184-187页

作者： Eduardo L. Cruz adolfo M. De guzman Department of Epidemiology and Biostatistics University of the Philippines Manila Philippines School of Statistics University of the Philippines Quezon City Philippines

The main objective of accelerated life tests in this setting is the recovery of the distribution of the random variable representing lifetime which is difficult to observe at a certain level of a given stress factor. A general model for accelerated life test is proposed that utilizes the inverse problem approach, that is, the variable is observe at different level/s and the transfer function is used to recover the elusive random variable (life time). The problem then is reduced to finding the transfer function. We derive some properties of the proposed general model. The Lognormal distribution and the Arrhenius model for lifetime are used as examples. Its relationship with the Cox proportional hazards model is also discussed.

关键词： Accelerated Life Test Arrhenius Model Inverse Problem

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