Papers by Keyword: Ground Movement

Abstract: Peck method and Stochastic medium method (SMM) are widely used in the field of ground movement included by urban soft ground tunnelling in China. The determination for the key parameter for SMM is also a problem because of the relative little experience from the engineering application in China. Through discussing the theoretical relationship between Peck method and SMM, Peck method can be regarded as a simplification of SMM where is used in relatively deeper excavation condition, and the method of determination for the key parameter for SMM is suggested. The suggested method are proven and verified by some practical engineering projects. Finally, they can significantly improve the adaptability of SMM in engineering application.

Abstract: In order to calculate the ground movement induced by displacement piles driven into horizontal layered soil, it is simplified to an axisymmetric problem. Then the vertical and horizontal ground movement functions were deduced based on stochastic medium theory. The vertical ground movement is a normal distribution function, while the horizontal ground movement is an exponential function. Utilizing field measured data, parameters of these functions can be obtained by back analysis. The example indicates that the stochastic medium theory is suitable for calculating the ground movement in pile driving, and there is no need to consider the constitutive model of soil or contact model of pile-soil interface in calculation. This method is fairly applicable in practice, and can provide a reference for related research.

Abstract: The complex construction behavior inevitably disturb surrounding environment, even when the tunneling goes through building, which may be wrecked. The security issues of the subway project stems from ground movement and structure dynamic interaction. So it is academic and application good value for study on construction influences of shield tunnel excavation to the neighboring buildings. This paper focuses on the shield tunnel construction strata deformation factors. The results provided the theory basis for safety construction.

Abstract: Based on the layout and geological conditions in 10203 test mining face of Gaoyang mine, This paper analyzed the three major factors influencing effects of filling mining that can be summarized as Fulfilling ratio, and goaffilling mining subsidence is expected to be full-span falls method of using calculating mining height prediction method, which provides a new approach for mining under buildings in the future.

Abstract: In this study a comprehensive field test program was carried out to closely monitor the ground responses during open-ended concrete pipe piles jacking into a deposit mainly consisting of silt soils. The horizontal soil movement due to pile jacking was of depth-dependent characteristic that cylindrical cavity expansion models were unable to capture. The magnitude of displacement decreased rapidly with depth, and no discernible deflection was measured below the depth of the pile tip. The maximum displacement along the depth occurred at clayey-silt layer with relative lower permeability. The rebound of soil movement may be attributed to the setup effect following the piling stage.

Abstract: This paper presents a case history involving a failure of water pipeline due to a deep excavation. The case history was analyzed using both the simplified method and more sophisticated finite element modeling. Also presented are the fundamentals of damage assessment of buried pipelines associated with deep excavation-induced ground movements. A number of ground displacement profiles pertinent to the damage assessment are introduced. The results of the analysis indicated that the excessive ground movement was the major cause for the failure. These results were partly supported by the finite element analysis which takes the soil-pipe interaction effect account. It is demonstrated that although conservative, the simplified approach presented in this paper can be effectively used as a first-order method for excavation-induced pipeline damage.