强夯法处理吹填海砂地基现场试验研究  

Field test on the treatment of hydraulic reclamation sand foundation by dynamic compaction

作　　者：吴民晖 刘海旺 WU Min-Hui;LIU Hai-wang(China Airport Planning&Design Institute Co.,Ltd.,Beijing 100011,China;Observation and Research Base of Transport Industry of Airport Engineering Safety and Long-term Performance,Beijing 100011,China;Fiijian Zhaoxiang Airport Construction Co.,Ltd.,Xiamen 361000,Fujian,China)

机构地区：[1]民航机场规划设计研究总院有限公司,北京100011 [2]机场工程安全与长期性能交通运输行业野外科学观测研究基地,北京100011 [3]福建兆翔机场建设有限公司,福建厦门361000

出　　处：《地基处理》2022年第4期322-328,共7页Journal of Ground Improvement

摘　　要：近些年随着我国国民经济的发展,东部沿海地区可利用的土地资源越来越少。吹填海砂造陆已经成为沿海工程建设的重要组成部分。填海造陆工程一般具有面积大、软弱土层深厚和填筑材料多样等特点,地基处理难度大。为了研究强夯在吹填海砂地基的加固效果,在某吹填海砂场地开展2 000、3 000和4 000 kN·m能级强夯加固试验。试验分别采用标准贯入试验、重型动力触探试验、波速试验和平板载荷试验进行现场检测。检测数据对比分析发现:强夯处理后标准贯入试验击数、重型动力触探击数和波速均明显提高,有效加固深度明显超过经验值;通过平板载荷试验p-s曲线,得到夯后砂土地基承载力特征值大于150 kPa,结果表明强夯法处理吹填海砂地基能有效提高其强度,证明了强夯法在吹填海砂地基的适用性。In recent years, with the development of national economy of China, there are less land available in east coastal areas. Reclamation with sea sand has become an important part of coastal engineering construction. Land reclamation from the sea generally has the characteristics of large area, deep soft soil layer and various filling materials,and the foundation treatment is difficult. In order to study the reinforcement effect of dynamic compaction on hydraulic reclamation sea sand foundation, 2 000, 3 000 and 4 000 kN·m dynamic compaction reinforcement tests were carried out in a hydraulic reclamation sea sand site. Standard penetration tests, heavy dynamic penetration tests, wave velocity tests and plate load tests were used for site inspection. By comparing and analyzing the test datas found that the blow count of standard penetration test, blow count of heavy dynamic penetration test and wave velocity are significantly improved after dynamic compaction, and the effective reinforcement depth is significantly higher than the empirical value. Through the p-s curves of plate load test, the characteristic value of bearing capacity of compacted sand foundation is above 150 kPa. The results show that the strength of hydraulic reclamation sea sand foundation treated by dynamic compaction method can be effectively improved and proves the applicability of dynamic compaction method in hydraulic reclamation sea sand foundation.

关 键 词：吹填海砂 强夯处理 标准贯入试验 重型动力触探 波速 载荷试验 

分 类 号：TU41[建筑科学—岩土工程]