盐穴储气库群地表铁路路基变形及运输安全评价

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Abstract It is a key problem for reducing the width of railway safety belt reasonably according to the evaluation result of railway roadbed subsidence and deformation，which determines the feasibility of Hubei Yunying salt cavern gas storage group. The creep contraction of salt cavern volume during operation period is the main cause of ground subsidence. Based on the hypothesis that the subsidence basin volume approximately has a relation of direct ratio with the creep contraction volume，the ground subsidence curve could be fitted as a Gauss function. Two key parameters of volume transfer coefficient and impact angle were introduced；and the formula for ground subsidence above a single cavern was deduced under condition of a certain volume shrinkage. The formula was used in the ground subsidence prediction of planned Hubei Yunying salt cavern storage. Finally，the ground subsidence above the salt cavern gas storage group was forecasted by superposition method. To solve the conflict of railway safety belt and planned salt cavern site，according to different roadbed deformation standards and salt cavern gas storage group ground subsidence above prediction results，the suggestion of reducing width of railway safety belt is given，as well as the control method to reduce the ground subsidence above salt cavern gas storage group and the roadbed subsidence effect.

Key words： foundation engineering ground subsidence salt cavern gas storage fitting function method Gauss function creep contraction railway safety belt

Received: 27 April 2012

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http://www.rockmech.org/EN/Y2012/V31/I9/1776

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