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通过水平静载荷试验,对沉井和根式沉井的水平承载性能进行分析研究。试验采用单向单循环水平维持荷载法,对一个纯试验用沉井进行加载,试验完成后在沉井壁预留孔顶入根键,然后再进行根式沉井的水平承载试验。试验得到了沉井基础及根式沉井基础的水平承载力、沉井的变形、井身弯矩等成果。试验结果表明:根式沉井基础较普通沉井基础,水平极限承载力提高近60%;在水平荷载较小时,根键对承载性能的提高不明显,但随荷载增大,其提高越来越明显。
Through the horizontal static load test, the horizontal bearing capacity of caisson and root caisson is analyzed and studied. The experiment uses one-way single-cycle horizontal maintenance load method to load a pure test caisson. After the test is completed, the root key is reserved at the caisson wall, and then the horizontal caisson test is carried out. The results obtained are as follows: the horizontal bearing capacity of caisson foundation and root caisson, the deformation of caisson and the bending moment of wellbore. The experimental results show that the root caisson has a horizontal ultimate capacity of nearly 60% higher than that of ordinary caisson and the root key has little effect on the bearing capacity when the horizontal load is small. However, as the load increases, obvious.