水力插板透水式丁坝群减缓流速效果试验研究

发布时间：2018-11-04 16:40

【摘要】：水力插板透水丁坝是一种新型丁坝。以水力插板透水丁坝群、井柱桩透水丁坝群和实体丁坝群为研究对象进行动床模型试验。先测定各丁坝坝前和坝后各5 cm横断面上测点的流速,再用每个测点的流速算出平均流速,通过对比横断面的平均流速来判断各丁坝群减缓流速的差异性,并详细分析和解释其减缓流速差异性产生的机理。研究发现:水力插板透水丁坝群和井柱桩透水丁坝群流速的减少率和减少量同实体丁坝群相比,分别提高了34%,23%和107%,84%。流速减缓会影响丁坝的局部冲刷和坝后淤积,再对各丁坝群附近的地形进行测量,并用surfer8.0绘制了各丁坝群附近的地形图。结果发现:实体丁坝群的局部冲刷情况最为严重,坝后淤积范围最小;水力插板透水丁坝群的局部冲刷情况最不严重,坝后淤积范围最大;井柱桩透水丁坝群的局部冲刷情况和坝后淤积范围介于两者之间。
[Abstract]:Hydraulic plug plate permeable spur dike is a new type of dike. The dynamic bed model tests were carried out with hydraulic plug plate permeable spur dike group, well column pile permeable spur dike group and solid spur dike group as research objects. The velocity of measured points in front of each spur dam and 5 cm after dam was measured, then the average velocity of velocity was calculated by using the velocity of each measuring point, and the difference of deceleration velocity of each group of spur dikes was judged by comparing the average velocity of cross section. The mechanism of slowing the difference of velocity is analyzed and explained in detail. The results show that the velocity reduction rate and decrease amount of hydraulic plug plate permeable spur dike group and well pillar pile permeable spur dike group are increased by 3423% and 107%, respectively, compared with that of solid dike group. The local scour and siltation behind the spur dike will be affected by the slow flow velocity. The topography near each spur group is measured and the topographic map near the spur dike group is plotted by surfer8.0. The results show that the local scour of solid groin group is the most serious, and the area of sedimentation behind dam is the smallest, the local scour of hydraulic plug plate permeable spur dike group is the least serious, and the area of sedimentation behind dam is the largest. The local scour of well pile permeable spur dam group and the sedimentation range behind the dam are between them.
【作者单位】：新疆农业大学水利与土木工程学院;
【基金】：国家自然科学基金项目(51469032) 新疆高校科研计划项目(XJEDU2013I12) 新疆水利水电工程重点学科基金资助项目(xjzdxk-2010-02-12)
【分类号】：TV863

【相似文献】