问题包括排水管被堵、地基下沉，有时甚至出现了严重的结构性裂缝。
Problems include blocked drains, sunken foundations and, sometimes, large structural faults.
研究结果：通过系统的分析比较，涵洞地基加固处理常用两类方法：一是排水固结法，二是复合地基法。
Research results: Through systematically analyzing and comparing, the general measures of culvert foundation improvement are drainage and consolidation method and complex foundation method.
它不仅能提高持力层的承载力，减少地基变形量，同时还可以加速地基的排水固结作用。
It can not only increase the bearing capacity of supporting course, but also reduce the deformation modulus of the foundation and accelerate the drainage and consolidation function of the foundation.
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