砂土中桶形基础吸力值的设定范围

发布时间：2018-06-22 05:09

本文选题：吸力桶形基础 + 沉贯　；参考：《岩土力学》2017年04期

【摘要】：吸力桶形基础沉贯与所施加的吸力密切相关,吸力值设置太小会导致吸力基础沉贯速度过慢,施工效益降低;吸力值设置太大将产生较高的桶内土塞,吸力基础下沉不到预定位置,从而使其承载力达不到设计要求,或引起砂土地基产生管涌破坏,因此必须确定合理的吸力值以满足工程建设需要。通过吸力桶形基础的静力平衡条件获得了沉贯所需最小吸力值;根据桶壁底部土体破坏特性,并依据Hencky应力方程建立了桶壁内、外侧土体之间的有效应力表达式,求解了土塞加速上升时的临界吸力值;基于吸力桶形基础内部砂土的管涌破坏机制确定了最大吸力值,结合最大和最小吸力的理论公式得到了吸力桶形基础的最大沉贯深度。最后,采用实例数据验证了所提出的最小、临界和最大吸力理论公式的合理性。
[Abstract]:The sinking penetration of suction bucket foundation is closely related to the suction applied. If the suction value is too small, the sinking speed of suction foundation will be too slow and the construction benefit will be reduced; if the suction value is too large, a higher soil plug in the bucket will be produced. The suction foundation can not be settled at a predetermined position, which makes its bearing capacity fail to meet the design requirements, or cause pipeline failure of sand foundation. Therefore, a reasonable suction value must be determined to meet the needs of engineering construction. Through the static equilibrium condition of suction bucket foundation, the minimum suction value is obtained, and the effective stress expression between the inside and outside soil is established according to the failure characteristics of the soil at the bottom of the bucket wall and the Hencky stress equation. The critical suction value for accelerating rise of soil plug is solved, the maximum suction value is determined based on the mechanism of internal sand surge failure of suction bucket foundation, and the maximum penetration depth of suction bucket foundation is obtained by combining the theoretical formula of maximum and minimum suction. Finally, the rationality of the theoretical formula of minimum, critical and maximum suction is verified by the example data.
【作者单位】：山东科技大学山东省土木工程防灾减灾重点试验室;山东科技大学土木工程与建筑学院;河海大学岩土工程研究所;
【基金】：国家自然科学基金(No.51639002,No.51379118) 山东科技大学科研创新团队(No.2015TDJH104)~~
【分类号】：TU441

【相似文献】