某季冻区热力涵洞对路面的冻胀影响研究

STUDY ON THE INFLUENCE OF THERMAL CULVERT ON PAVEMENT FROST HEAVING IN A SEASONAL FROZEN SOIL REGION

研究区域位于松嫩平原西部,自然区划属Ⅱ3区。地理位置北纬45°46’~46°55’,东经124°19’~125°12’之间,区域地处北温带大陆性季风气候区。道路路基透水性差,极易产生强冻胀,导致涵洞两侧路面产生较大的坡差。文中主要在2019~2020冻胀期内采用间隔观察法分时段利用GPS测量路面冻胀高差及用钢尺量测冻胀影响距离,测算该区域供热涵洞两侧在冻融周期冻胀的最大影响范围,进而提出预防桥涵两侧冻胀引起相对沉陷的技术措施,减少冻胀对行车安全的影响。

The study area is located in the west of Songnen Plain, Natural divisions Ⅱ3 area. The urban area is located between latitude 45°46’ N to 46°55’ N and longitude 124°19’ E to 125°12’ E. The region is located in the north temperate continental monsoon climate zone. Due to the poor permeability of roadbed, it is easy to suffer strong frost heave, resulting in a large slope difference on the road surface on both sides of the culvert. In this paper, the interval observation method was used to measure the elevation difference of road surface frost heaving by GPS and steel scale is used to measure the influence distance of frost heaving at different periods during 2019-2020 frost heaving period to calculate the maximum influence range of freezing-thawing cycle freezing-thawing frost heaving on both sides of the district heating culvert. The technical measures to prevent relative subsidence caused by frost heaving on both sides of the bridge and culvert were put forward, so as to reduce the impact of frost heave on traffic safety.