地表水入渗引起工程抗浮问题及对策

Anti-floating Problems Caused by Surface Water Infiltration and Countermeasures

城市地下空间利用日趋受到重视,工程抗浮问题成为岩土工程领域的一个重要部分。对于建筑物整个使用期的抗浮研究相对深入,但往往对于由工程施工本身引起的、改变水文地质条件后可能存在的抗浮问题不够重视。近年来,信阳市垄岗地貌分布区高层建筑及整体地下车库建设规模较大。由于垄岗地形地貌的岩土体渗透性较差,同时该地区5—8月份暴雨较为集中,地表水通过肥槽等薄弱环节进入基础底板以下,易造成地下结构破坏。结合具体案例,研究地表水入渗引起工程抗浮问题并提出相应措施,工程实践效果良好。

As more attention has been paid to urban underground space,anti-floating problems become an important part of geotechnical engineering.Although the anti-floating research for the building service life is relatively thorough,but the probably anti-floating issues caused by construction or hydrogeological condition changes are normally ignored.In recent years,large-scale high-rise buildings and integral underground parking garages are constructed in ridges landform area.Due to the poor permeability of rock and soil mass in ridges landform,and heavy rains from May to August in this area,surface water may destroy underground structures by penetrating into the foundation floor through weak links of trench backfill.Combining with specific cases,anti-floating problems caused by surface water infiltration are studied and the countermeasures are provided,which is of good performances in practice.