Abstract：Research purposes: CPⅢvertical control network plays an important role in ensuring the vertical static regularity of the ballastless track of hish—speed railway．It以en needs repeated measurement in order to assure the reliability of the measurement results．However，the divergence tolerance of elevation and altitude difference between adjoining points of high—speed railway with CPIII is generally determined on the basis of large amount of statistic data，other than rigorous theoretic derivation．So the research on principle of rigorous estimation of divergence tolerance of elevation and altitude difference between adjoining points of high—speed railway with CPIII is significant to assuring establishment of CPIII vertical control network and reliability of the measured data for hish—-speed railway．
Research conclusions: According to the principle of the square difference，the model for the divergence tolerance of elevation and altitude difference between adjoining points of hish—-speed railway with CP III Was derived．And with this model．the simulated calculation Was done for the analogue CPⅢvertical control network measured with German surveying method and China rectangle surveying method and its result Was consistent with the specification of divergence tolerance of elevation and altitude difference between adjoining points of hish—speed railway with CPIII stipulated in the current code for engineering survey of hish—speed railway．The research result provides theoretical basis for the specification of divergence tolerance of elevation and altitude difference between adjoining points of high—speed railway With CPⅢ
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2010, Vol. 27 
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