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膨胀土是土颗粒成分主要由亲水性矿物组成并具有显著的吸水膨胀和失水收缩两种变形特性的特殊土,常给工程建设带来极大的危害。该文以膨胀土地区某高速公路为依托工程,运用试桩浸水载荷试验对膨胀土浸水膨胀对桥梁桩基承载力与摩阻力的影响进行了研究。结果表明:膨胀土地区试桩浸水后极限承载力会降低,同时试桩会在不同深度范围内产生正负相间的摩阻力,且其发展变化趋势完全相同,主要表现为浸水初期发展变化较快,其后发展变化越来越慢且有稳定趋势,且均随浸水时间的增加逐步增大,停止浸水后,桩身正负摩阻力迅速减小并很快趋于稳定,同时还会发生重分布现象,究其原因应该是试桩周围膨胀土释水重固结的影响,且释水重固结时间较短。
Expansive soil is a special soil whose soil particle composition is mainly composed of hydrophilic minerals and has two distinct deformation characteristics of water absorption expansion and water loss and shrinkage, which often brings great harm to the engineering construction. In this paper, an expansive soil area relies on a highway project, the use of test pile immersion load test of expansive soil immersed in water on the bridge pile foundation bearing capacity and friction resistance were studied. The results show that the ultimate bearing capacity of the test pile in the expansive soil area will decrease after soaking, and the test pile will produce positive and negative frictional resistance in different depth ranges. The development trend of the test pile is exactly the same. , Followed by the development of more and more slow and steady trend, and both increased gradually with the increase of immersion time, stop immersion, positive and negative pile resistance rapidly decreased and quickly stabilized, and will also occur weight Distribution phenomenon, the reason should be the impact of expansive soil around the test pile of water and heavy consolidation, and the water re-consolidation time is shorter.