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近几年来深圳特区高层楼寓建筑发展迅速,但本地区的工程地质较复杂,地基土常有较厚的填土或软弱覆盖土层,土层中以第四系土及残积土为主,厚薄不均,有时同一建筑场地的[R]及E_s差别也很悬殊,对采用天然地基的箱型基础亦缺乏足够的地基土物理力学性能的试验资料。为此,绝大多数高层建筑中均采用各种类型的现场混凝土灌注桩,如直径800～1400mm的冲、钻孔灌注桩及1200～3200mm的挖孔灌注桩,桩端持
In recent years, the high-rise buildings in the Shenzhen Special Zone have developed rapidly. However, the engineering geology in this area is relatively complex. The foundation soil often has thick soil filling or soft covering of soil layers. The soil layer is dominated by Quaternary soil and residual soil. Uneven thickness, sometimes the difference between [R] and E_s of the same building site is also very different, and there is also insufficient test data on the physical and mechanical properties of foundation soil for the box foundation using natural foundation. Therefore, most types of on-site concrete cast-in-place piles are used in most high-rise buildings, such as punched and drilled cast-in-place piles with diameters of 800 to 1400 mm and bored cast-in-place piles of 1200 to 3200 mm.