天津港突堤转角处高桩码头后承台构件相对错位破损原因

近几年天津港多个突堤转角处的高桩码头岸坡变形比较明显,导致码头后方承台结构构件出现明显的相对错位、变形等破损情况,严重影响了码头结构物安全。通过对破损状况的调查统计,总结出了破损的特点,对破损的原因进行了理论分析,并用原型观测和数模计算结果进行了验证。原型观测结果表明:码头岸坡内的淤泥质粘土层为水平位移最明显土层,靠近挡土墙的大部分桩顶都出现了不同程度的向陆侧倾斜,这与实际见到的桩端倾斜状况完全相符。数模计算结果除验证了原型观测的结果以外,还发现仅在后方堆场堆载工况为最危险情况,是造成岸坡变形和后方承台构件相对错位的主要原因。

Causes of Damage Resulted from Relative Displacement of Bearing Platform of Piled Wharfs at Corners of Piers in Tianjin Port

In recent years, evident deformation of shore slope for piled wharf occurred at many corners of piers in Tianjin Port, resulting in relative displacement and deformation of inshore structures, which grievously affects the safety of wharf structures. Based on the investigation and statistics of the damage to the wharf structures, the characteristics of the damage were summarized and the causes of the deformation were theoretically analyzed, which were verified by field observation and mathematic models. The results of field observation showed that mucky clay in the shore slope of the wharfs was the stratum with the most obvious horizontal displacement and most of the pile heads close to the retaining walls inclined towards the land to different degrees, agreeing well with the inclination of pile heads as observed on site. The results of the mathematic models have not only verified the results of the field observation but also discovered that the worst situation occurred when cargos were placed only on the stacking yards behind the wharfs, which was the main cause for shore-slope deformation and the relative displacement of bearing platforms of the wharfs.