预浸水法在棉山湾水库湿陷性黄土坝基处理中的应用

The application of presoaking methods in treatment for collapsible loess ground soil at Mianshanwan reservoir

在湿陷性黄土地基上修建土坝,由于地基湿陷引起附加沉降对土坝带来很大隐患,因此,选择适宜的地基处理方法成为建坝的关键.以棉山湾水库左岸Ⅳ级自重湿陷性黄土坝基采用预浸水法处理为例,介绍了预浸水处理的具体方法,通过观测成果、浸水效果分析,探求湿陷量、耗水量与浸水时间的关系及湿陷量的阶段特征.棉山湾水库湿陷性黄土坝基预浸水处理的成功应用,为宁夏山区湿陷性黄土基础上建坝提供了详实的资料和经验,为类似工程起到借鉴作用.

If dam is built on collapsible loess ground soil, great hidden troubles might be caused by the additional settlement of the collapse of loess ground soil, so the key point to build dam is to use proper treatment for ground settlement. Take the presoaking methods in treatment for building dam on IV level self-weight collapsible loess ground soil on the left bank of Mianshanwan reservoir as an example. This article introduces presoaking methods in treatment for dam building at collapsible loess ground soil. Based on surveying the effectiveness, analyzing presoaking efficiency, measuring the collapsibility, water- consuming, soaking time and the phase characteristics, the application of the presoaking methods is effective. This successful attempt not only provides concrete data, information and experience for future dam building on collapsible loess ground soil in Ningxia, but also provides guidance for similar projects.