论文部分内容阅读
桩位处预钻孔是工程中减弱沉桩挤土效应的有效措施之一。根据Drucker-Prager破坏准则及有限变形理论,建立了桩–土相互作用及连续贯入的有限元模型,利用得到的模型模拟了预钻孔措施下沉桩产生的挤土位移场,并和现场实测进行了对比。结果表明,预钻孔的孔径与孔深是影响静压桩挤土效应的重要因素,二者的结合会更有效地减少挤土效应的广度和深度。在同样孔深情况下,随着孔径的增大,所产生的挤土位移相应减小;相同孔径情况下,孔越深产生的挤土效应就越小。
Pre-drill hole at the site is one of the effective measures to reduce the effect of pile sinking. According to the Drucker-Prager failure criterion and finite deformation theory, the finite element model of pile-soil interaction and continuous penetration is established. The model is used to simulate the displacement field of squeezed soil produced by pile sinking under the pre-drilling measures. Measured for comparison. The results show that the hole diameter and hole depth of the pre-drilled holes are important factors that affect the squeezing effect of jacked piles. The combination of the two can effectively reduce the breadth and depth of the crowding-out effect. Under the condition of the same hole depth, the displacement of squeezed soil decreases with the increase of the hole diameter. The smaller the squeezing effect caused by the hole with the same hole diameter is.