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Kelio trasos horizontaliųjų kreivių įtaka transporto srauto greičiui / Influence of road alignment horizontal curve on transport flow operating speed

Abstract

Geometric parameters of road alignment are fundamental elements defining permissible speed and vice versa. Unlike permissible speed, determined operating speed in upgrade projects has a significant impact on the safe movement of transport on the roads. The article reviews the composition of the regional road network in Lithuania, the design speed, the permitted speed, the practical problems of applying the geometry parameters of the road alignment according to the legal documents valid in Lithuania, methods of horizontal curve selection in Lithuania and other countries are analysed in more detail. Comparative initial calculations of horizontal curves were performed using different side friction coefficients. Review summary of analysis conducted and statements are prepared for discussion.


Santrauka


Kelio trasos geometriniai parametrai yra pagrindiniai elementai, apibrėžiantys leistiną važiavimo greitį, ir atvirkščiai. Skirtingai nei leistinas važiavimo greitis, transporto srauto greitis kelių ruožų atnaujinimo projektuose turi didelę įtaką saugiam transporto judėjimui keliuose. Straipsnyje apžvelgiama rajoninės reikšmės kelių tinklo sudėtis Lietuvoje, kelių su žvyro danga atnaujinimo projektuose taikomi projektinis greitis, leistinas greitis, praktinės problemos taikant kelio trasos geometrinius parametrus pagal Lietuvoje galiojančius normatyvinius dokumentus, nuodugniau nagrinėjami horizontaliųjų kreivių parinkimo metodai, taikomi Lietuvoje ir kitose šalyse. Atlikti lyginamieji pradiniai horizontaliųjų kreivių skaičiavimai, taikant skirtingus šoninės trinties koeficientus. Atliktas apibendrinimas ir suformuluoti teiginiai diskusijai.


Reikšminiai žodžiai: horizontaliosios kreivės, projektinis greitis, transporto srauto greitis.

Keyword : horizontal curves, design speed, operating speed

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Oct 11, 2019
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