循环荷载作用下桩周土体强度弱化特性试验研究

发布时间：2018-08-07 10:05

【摘要】：软黏土地基在循环周期荷载的连续作用下不会发生液化现象,但是随着循环荷载的周期、振幅、应力的不断增加,土体的有效强度会不断降低,从而引起土体破坏。特别是桩结构在工作期间除了要承受竖向的荷载外,还将受到波浪、冰荷载以及船的撞击荷载。这些荷载一般都具有往复作用的性质,这种往复荷载作用期间会使桩周土体产生疲劳效应,土体结构发生破坏,引起桩周土体的弱化。通过室内动三轴模拟天津码头区域桩周土承受的静(结构荷载)、动(波浪荷载)组合作用,对振动前后桩周土体的强度弱化情况进行研究,试验获得该区域桩周土体在周期荷载作用下,土体土体强度的变化关系。同时提出一个相对较简单且符合试验规律的天津地区桩周土的强度弱化公式,为该地区土体弱化的评估提供参考依据。
[Abstract]:The liquefaction of soft clay foundation will not occur under the continuous cyclic load, but with the increasing of cycle load, amplitude and stress, the effective strength of soil will decrease continuously, thus causing soil failure. In particular, the pile structure will be subjected to waves, ice loads and ship impact loads in addition to vertical loads during work. These loads generally have the property of reciprocating action. During this kind of reciprocating load, the soil around the pile will have fatigue effect, the soil structure will be destroyed, and the soil around the pile will be weakened. Through indoor dynamic triaxial simulation of static (structural load) and dynamic (wave load) combined action of soil around piles in Tianjin wharf area, the strength weakening of soil around pile before and after vibration is studied. The relationship between the soil strength and the soil strength around the pile is obtained by the experiment. At the same time, a relatively simple and consistent with the test law of the strength of the soil around the pile in Tianjin is put forward to provide a reference for the evaluation of the weakening of the soil in this area.
【作者单位】：天津大学建工学院;交通运输部天津水运工程科学研究所;上海水利工程设计研究院有限公司;
【基金】：天津市自然科学基金青年项目(No.13JCQNJC07800) 国家自然科学基金(No.51209112)
【分类号】：U655.55

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