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New design equations for estimation of ultimate bearing capacity of shallow foundations resting on rock masses

Geoscience Frontiers 2016年第1期7卷 91-99页

作者： Amir H.Alavi Ehsan Sadrossadat Department of Civil and Environmental Engineering Michigan State University Department of Civil Engineering Mashhad BranchIslamic Azad University

rock masses are commonly used as the underlying layer of important structures such as bridges, dams and transportation constructions. The success of a foundation design for such structures mainly depends on the accuracy of estimating the bearing capacity of rock beneath them. Several traditional numerical approaches are proposed for the estimation of the bearing capacity of foundations resting on rock masses to avoid performing elaborate and expensive experimental studies. Despite this fact, there still exists a serious need to develop more robust predictive models. This paper proposes new nonlinear prediction models for the ultimate bearing capacity of shallow foundations resting on non-fractured rock masses using a novel evolutionary computational approach, called linear genetic programming. A comprehensive set of rock socket, centrifuge rock socket, plate load and large-scaled footing load test results is used to develop the models. In order to verify the validity of the models, the sensitivity analysis is conducted and discussed. The results indicate that the proposed models accurately characterize the bearing capacity of shallow foundations. The correlation coefficients between the experimental and predicted bearing capacity values are equal to 0.95 and 0.96 for the best LGP models. Moreover, the derived models reach a notably better prediction performance than the traditional equations.

关键词： rock mass properties Ultimate bearing capacity Shallow foundation Prediction Evolutionary computation Linear genetic programming

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Deformation Analysis of LRC Underground Gas Storage

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Journal of Civil Engineering and Architecture 2011年第6期5卷 548-554页

作者： Primoz Jelusic Bojan Zlender Faculty of Civil Engineering University of Maribor Smetanova 17 SI-2000 Maribor Slovenia

The risk during construction and in the operation of the underground gas storage （UGS） was analyzed. One of most important risk which should be prevented is large deformation or destruction of the steel lining. The specific deformation of the steel lining needs to be inside the acceptable value. This paper presents lined rock cavern （LRC） concept and specific deformations, which can occur under operation of underground gas storage. Analysis is performed with different （3D model and axis symmetrical） FEM models and analytical model. We made a comparison between analytical calculation and FEM calculation. Concrete wall is mechanically not regarded as reinforced concrete structure which means that concrete will crack. Finally, we determined the minimum value of Young＇s modulus, which satisfies the condition of maximum deformation of steel lining.

关键词： Underground gas storage lined rock cavern interaction concrete-rock rock mass properties rock mechanics.

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