利用动刚度法评价营运高速公路桥梁桩基承载力

Evaluate Bearing Capacity of Operating Highway Bridge Piles Using Dynamic Stiffness Method

地震、软土侧向位移、船舶撞击、桩基施工质量不佳等均会导致营运高速公路桥梁桩基出现损伤,有必要选择合适的检测方法确定营运高速公路桥梁桩基承载力。然而,常规的静载试验较难应用于测试营运高速公路桥梁桩基的承载力。基于瞬态导纳法理论,提出利用动刚度法评价营运高速公路桥梁桩基的承载力。为了评价动刚度法的实际应用效果,将其用于检测广东省某营运高速公路特大桥桩基的承载力。采用取芯法并结合承载力验算结果对动刚度测试方法进行了验证,验证结果表明:相同类型的基桩动刚度的大小直接反应了其承载力的大小,基桩桩身质量越差,动刚度值相应越小。

Earthquakes, lateral displacement of soft soil, ship impact, bad construction quality of bridge piles etc will result in damage of operating highway bridge piles, it is necessary to choose the appropriate test method to determine the bearing capacity of highway bridge pile foundation. However, it is difficult to apply the conventional static load test to achieve the bearing capacity of highway bridge pile foundation. Based on transient admittance .theory, the dynamic stiff- ness method is applied to evaluate the bearing capacity of highway bridge pile foundation. In order to evaluate the prac- tical application of dynamic stiffness method, it is used to test the bearing capacity of the Guangdong provincial express- way bridge pile foundation. Using coring method and the calculation pile capacity confirms the validation of dynamic stiffness test method＇s results. Validation results show that the same type pile＇s dynamic stiffness is response to the pile＇s beating capacity, Worse pile foundation quality is, smaller the value of dynamic stiffness is