单排钢板桩围堰水平位移监测分析

Monitoring and Analysis of Horizontal Displacement of a Single-Rowed Steel Sheet Pile Cofferdam

某水利工程内河施工围堰采用单排钢板桩(拉森IV型)形式,通过计算分析可知实际应用中关键是克服并控制单排钢板桩围堰变形。在围堰上布置水平位移监测点监测和分析单排钢板桩围堰在挡水期间变形状况。通过监测数据分析发现,在挡水期间,单排钢板桩围堰水平位移受水位变化影响很大,随着变形增大,围堰产生漏水现象,围堰后采用抽水并土体回填的方式进行围堰加固,使得围堰变形趋于稳定,有效保证了主体工程顺利施工。

The cofferdam of some inland in water construction projects adopts the concept of single-rowed steel sheet pile system, which has the advantages of simple installation, low investment, and scour resistant, but they are rarely used in actual projects. The calculation and analysis of the single rowed steel sheet pile system show that the key to practical application is to effectively control the cofferdam deformation. The purpose of this paper is to analyze the deformation during the dewater by installation of horizontal displacement monitoring points on the cofferdam. The analysis of the monitoring data shows that during the dewater period, the horizontal displacement of the single-rowed steel sheet pile cofferdam is significantly affected by water level changes. As the deformation increases, the cofferdam leaking is occurred. The cofferdam strengthening measures such as backfills and lower the water level should be applied so that the stability of the cofferdam can be warranted.