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岩土工程中存在多种耦合作用,在水利水电工程中,渗流场与应力场的耦合是最重要的。以某水利枢纽厂房基坑开挖为工程背景,比奥固结理论为理论基础,莫尔-库仑准则为土体屈服判据,对基坑开挖过程中渗流耦合进行了数值模拟。计算结果显示:回填后的应力略大于开挖过程中的应力,沉井附近出现一定程度的应力集中。回填前后塑性区变化不大且范围较小,因而土体的屈服破坏不是该工程的重点。由于土体渗透系数大,厂房区地下水位高,基坑开挖过程中渗水量较大,回填后沉井及基坑底部防渗底板的防渗效果显著,因而在基坑开挖过程中防渗排水是该工程的重点问题。
There are many kinds of coupling effects in geotechnical engineering. In water conservancy and hydropower projects, the coupling of seepage field and stress field is the most important. Taking the excavation of the foundation pit of a water complex as the engineering background and the theory of Biot consolidation as the theoretical basis, the Mohr-Coulomb criterion is the soil yield criterion, and the numerical simulation of seepage-flow coupling in the process of excavation of foundation pit is carried out. The calculation results show that the stress after backfilling is slightly larger than the stress during excavation, and a certain degree of stress concentration occurs near the caisson. Plastic area before and after backfill little change and a small range, so the soil yield damage is not the focus of the project. Due to the large permeability coefficient of soil, high underground water level in the plant area and large amount of water seepage during excavation, the anti-seepage effect of caisson and backfill bottom of foundation pit is significant after the backfilling. Therefore, during the excavation of foundation pit Seepage and drainage is the key issue of the project.