单向流条件下单桩桩周冲刷过程特征试验研究
发布时间：2018-11-15 15:46
【摘要】：水流引起桩基周围地基冲刷是海洋工程中的经典课题,由于问题涉及流体动力学和土力学的交叉内容,加之试验技术和计算能力的限制,这一冲刷过程仍有很多方面尚待进一步厘清。开展10组室内水槽试验,研究了不同水深情况下定床和动床冲刷时单桩桩周局部冲刷深度的发展过程。在试验过程中,通过模型桩内放置摄像机实时监测桩周冲刷深度变化,得到桩周冲深边界及最大和最小冲深方位随时间的变化曲线。试验研究发现这一冲刷过程主要特征为:局部冲刷首先发生在桩(侧)前方并逐渐向桩周扩展,而桩后则先发生淤积后再冲刷;水深越大,流速越大,桩后淤积现象持续时间越短,桩周冲刷发展迅速、均匀,但达到稳定所需时间越久;桩周最大、最小冲深点首先分别位于桩的侧前方、桩后区域,随着试验进行会发生转变或波动。
[Abstract]:The erosion of foundation around pile foundation caused by water flow is a classical subject in ocean engineering, because the problem involves the intersection of hydrodynamics and soil mechanics, in addition to the limitation of test technology and calculation ability. There are still many aspects of this scouring process that need to be further clarified. Ten groups of indoor flume tests were carried out to study the development process of local scour depth around single pile under different water depth under fixed bed and moving bed scour. In the course of the experiment, the change of the flushing depth around the pile is monitored in real time by placing a camera in the model pile, and the curves of the boundary and the maximum and minimum azimuth of the impact depth of the pile with time are obtained. The experimental results show that the main characteristics of the scour process are as follows: firstly, the local scour occurs in front of the pile (side) and gradually extends to the pile, while the pile first silts and then scours; The larger the water depth, the greater the velocity of flow, the shorter the time of siltation behind the pile, the faster and more uniform the scour around the pile is, but the longer it takes to achieve stability. The maximum and minimum impingement depth points are located in the front of the pile and behind the pile, which will change or fluctuate with the test.
【作者单位】： 浙江省海洋岩土工程与材料重点实验室浙江大学建筑工程学院;浙江省交通规划设计研究院;温州市交通投资集团有限公司;
【基金】：国家国际科技合作专项(2015DFE72830) 国家杰出青年科学基金(51325901) 国家自然科学基金(51209183) 浙江省自然科学基金(LY15E090002) 中央高校基本科研业务费(2015QNA4023)
【分类号】：TV148
本文编号：2333722
[Abstract]:The erosion of foundation around pile foundation caused by water flow is a classical subject in ocean engineering, because the problem involves the intersection of hydrodynamics and soil mechanics, in addition to the limitation of test technology and calculation ability. There are still many aspects of this scouring process that need to be further clarified. Ten groups of indoor flume tests were carried out to study the development process of local scour depth around single pile under different water depth under fixed bed and moving bed scour. In the course of the experiment, the change of the flushing depth around the pile is monitored in real time by placing a camera in the model pile, and the curves of the boundary and the maximum and minimum azimuth of the impact depth of the pile with time are obtained. The experimental results show that the main characteristics of the scour process are as follows: firstly, the local scour occurs in front of the pile (side) and gradually extends to the pile, while the pile first silts and then scours; The larger the water depth, the greater the velocity of flow, the shorter the time of siltation behind the pile, the faster and more uniform the scour around the pile is, but the longer it takes to achieve stability. The maximum and minimum impingement depth points are located in the front of the pile and behind the pile, which will change or fluctuate with the test.
【作者单位】： 浙江省海洋岩土工程与材料重点实验室浙江大学建筑工程学院;浙江省交通规划设计研究院;温州市交通投资集团有限公司;
【基金】：国家国际科技合作专项(2015DFE72830) 国家杰出青年科学基金(51325901) 国家自然科学基金(51209183) 浙江省自然科学基金(LY15E090002) 中央高校基本科研业务费(2015QNA4023)
【分类号】：TV148
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