强夯处理后的路基沉降计算

在强夯施工中一般认为达到收锤标准后地基不再发生过大的沉降,另外强夯后地基土的变形参数也不易确定,因而强夯地基一般不进行沉降计算.在广东清远北江三桥一级路沉降观测数据整理时,发现夯后的地基仍有较大的沉降.笔者总结了原位测试(标准贯入和静力触探)参数与地基土体的变形参数之间的关系式,并通过现场地基检测的数据反算了地基土的变形参数,最后通过分层总和法计算了路堤的变形沉降.该方法的计算结果能与高速公路实测沉降相吻合.

Embankment settlement calculation after dynamic consolidation

It is considered that little settlement would occur after dynamic consolidation if criterion of stopping tamping is carried out. At the same time, it is difficult to obtain soils' strain properties after dynamic consolidation, so settlement calculation after dynamic consolidation is often ignored. But during analysis of settlement of Qingyuan third bridge's highway, it was founded that enough settlement of embankment happens on foundations after dynamic consolidation. So the relation between CPT and SPT and soils' strain modulus are summarized, and is used to determine strain modulus after dynamic consolidation by testing datum in site. At last, the calculated settlement by the layer-wise summation method and obtained soils' strain modulus can be consistent with that of observation.