摘要
对于软土地基上的新型桶式基础防波堤,其稳定性分析的关键是桶壁土压力分析。根据实际工程,通过数值模拟,分析了不同荷载水平、不同荷载作用点高度、不同土质状况下桶壁土压力的分布规律。分析发现,不同情况下的软土地基新型桶式基础防波堤,桶壁土压力分布区域可分为海侧圆弧端主动土压力区、两侧直壁端静止土压力区及陆侧圆弧端被动土压力区。经与理论计算的Rankine主动、被动土压力和静止土压力的对比分析发现,海侧主动区的土压力与陆侧被动区土压力分别介于主动土压力与静止土压力、静止土压力与被动土压力之间,两侧直壁端的桶壁土压力与静止土压力比较接近。在两端圆弧段,桶壁土压力沿深度分段线性分布,且单宽桶壁土压力合力与荷载水平呈线性关系。当荷载作用点的高度发生变化时,桶壁土压力的分布规律相类似。基于桶壁土压力的分布形式,提出了桶壁土压力的简化计算方法,为计算桶体稳定性带来方便。
The key analysis of the stability of the new bucket foundation breakwater on soft foundation is the analysis of the soil pressure on the bucket wall. According to the practical works and by means of numerical analysis,the soil pressure distribution on the bucket wall is analyzed for different load levels,different heights of load application points and different soils in this study. By analyzing,it is found that in different conditions the soil pressure on the bucket wall can be divided into the active region on the circle end of the sea side,the static region on the straight side and the passive region on the circle end of the land side for the new bucket foundation breakwater on soft ground. Comparing with the theoretical Rankine active earth pressure,passive earth pressure and static earth pressure,on sea side,the earth pressure in the active region ranges from active earth pressure to static earth pressure,while on the land side,the earth pressure in the passive region ranges from static earth pressure to passive earth pressure. On the straight wall of the two flanks of the bucket,the earth pressure is approximate to the static earth pressure. For the new bucket foundation breakwater on soft foundation,on the two circle ends of the bucket,the distribution of the soil pressure is stepped linearly along the depth direction,and the relationship is linear between the per breadth resultant of soil pressure and load levels,and when the height of load application points changes,the law of the distribution of the soil pressure is similar. According to the distribution patterns of the earth pressure on the bucket wall,a simplified calculation method is given in this study,and the analysis of the stability of the bucket will become more convenient.
出处
《水利水运工程学报》
CSCD
北大核心
2016年第5期39-46,共8页
Hydro-Science and Engineering
基金
江苏省科技支撑计划(社会发展)项目(BE201370828)
江苏省交通运输科技项目(2013Y20)
江苏省交通运输科技项目连云港港淤泥质航道和防波堤建设及维护技术研究与应用示范(2014T12)
关键词
新型桶式基础防波堤
桶壁土压力
分段线性
数值分析
new bucket foundation breakwater
soil pressure on the bucket wall
stepped linearly
numerical simulation
