卸荷式板桩高桩梁板码头结构土压力简化计算

A simplified analytical method for calculating the earth pressure of the unloading-type sheet pile wharf

河网地区的淤泥层一般较厚,强度较低,在这些地区新建或扩建码头时需对边坡进行大面积的开挖、换填,工程造价高,采用卸荷式板桩墙高桩梁板码头结构可以很好地解决,但目前关于这种码头结构型式的土压力计算研究非常少。借鉴遮帘板桩码头的土压力计算方法,分析探讨了该新型结构的土压力计算方法。计算中对结构进行分区处理,利用非极限状态土压力理论计算板桩河侧及灌注桩陆侧的土压力,同时考虑土拱效应和卸荷板的卸荷作用,以及平行墙理论,推导计算板桩陆侧及灌注桩河侧的土压力,最后将简化计算结果与离心模型试验结果及有限元数值分析结果进行对比,对比分析表明,该简化计算方法有一定的可行性,可供工程设计参考。

An ooze seam in a plain river network area generally has a large thickness and a low strength, In such an area, when some ports are built or expanded, the soft soil layers should be dug out and backfilled, leading to a high construction cost. Then the unloading-type sheet pile has be adopted to resolve the above issues owing to its lower construction expense. But the earth pressure for this structure has yet to be effectively evaluated. By drawing lessons from the earth pressure calculation of covered sheet pile wharf, a method for calculating earth pressure for this new structure is proposed. In this method, the whole structure is first divided into many parts, and then the earth pressures on sheet piles facing river and bored piles oriented to land are calculated based on the non-limit state earth pressure theory, meanwhile the earth pressures of sheet pile landside and bored pile riverside are also determined with considering the effect of soil arching and unloading. By comparing the analytical results with the results obtained from centrifuge model tests and finite element method, the applicability and reliability of the proposed method is demonstrated.