浅谈青藏融区与多年冻土区过渡带桩基地温变化规律

针对青藏高原的特点，通过对钻孔灌注桩及其周围土层温度变化过程的研究，了解混凝土温度与地基土温度的变化规律，作为选择混凝土防冻措施和混凝土拌和料温度的依据。通过对孔壁、桩侧（距桩侧35cm）、基准测温孔（距承台中心20m）的地温观测，把握混凝土施工材料及施工方法对钻孔灌注桩的回冻规律的影响，并对钻孔机具的性能、钻进效率、成桩工艺、桩体混凝土灌注工艺进行了研究。

Temperature Change of Pile Foundation in Transition Area from Melting Zone to Permafrost Zone on Qinghai-Tibet Plateau

According to the characteristics of Qinghai-Tibet Plateau, rule of temperature change of concrete and foundation is studied in the process of temperature changes of drilling pouring piles and surrounding soil to provide basis for the choice of concrete frost-proof measures and temperature of concrete mixing. The ground temperature of hole wall, pile-side （35 cm fiom the pile）, the benchmark hole （20 m from the supporting centre） is observed to grasp the effect on re-freeze law by concrete construction materials and construction methods. Performance, drilling efficiency, piling process of drilling equipment and pouring technique of pile concrete are studied.