【摘要】：水流引起樁基周圍地基沖刷是海洋工程中的經(jīng)典課題,由于問題涉及流體動力學和土力學的交叉內(nèi)容,加之試驗技術和計算能力的限制,這一沖刷過程仍有很多方面尚待進一步厘清。開展10組室內(nèi)水槽試驗,研究了不同水深情況下定床和動床沖刷時單樁樁周局部沖刷深度的發(fā)展過程。在試驗過程中,通過模型樁內(nèi)放置攝像機實時監(jiān)測樁周沖刷深度變化,得到樁周沖深邊界及最大和最小沖深方位隨時間的變化曲線。試驗研究發(fā)現(xiàn)這一沖刷過程主要特征為:局部沖刷首先發(fā)生在樁(側(cè))前方并逐漸向樁周擴展,而樁后則先發(fā)生淤積后再沖刷;水深越大,流速越大,樁后淤積現(xiàn)象持續(xù)時間越短,樁周沖刷發(fā)展迅速、均勻,但達到穩(wěn)定所需時間越久;樁周最大、最小沖深點首先分別位于樁的側(cè)前方、樁后區(qū)域,隨著試驗進行會發(fā)生轉(zhuǎn)變或波動。
[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.
【作者單位】： 浙江省海洋巖土工程與材料重點實驗室浙江大學建筑工程學院;浙江省交通規(guī)劃設計研究院;溫州市交通投資集團有限公司;
【基金】：國家國際科技合作專項(2015DFE72830) 國家杰出青年科學基金(51325901) 國家自然科學基金(51209183) 浙江省自然科學基金(LY15E090002) 中央高�；究蒲袠I(yè)務費(2015QNA4023)
【分類號】：TV148

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