At present, piles with circular are used in all casting bore-hole pile foundations, but these piles have smaller perimeter and smaller section modulus as compare with the rectangular ones;

目前钻孔灌注桩基中的桩均为园形截面，和矩形截面的桩相比，园桩的周长、断面系数较小，抗弯能力差。

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Authorities said then that eight masked, heavily armed men in clothing resembling police uniforms had burst through a hole in the perimeter fence onto the airport tarmac in two vehicles.

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