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采用非线性有限元法分析了黄土地区挤扩支盘灌注桩桩端和承力盘下土层的性质,研究了荷载传递特性和承力盘的受力机理,通过现场静载荷试验,进一步表明挤扩支盘桩的荷载传递规律是由上向下逐渐传递,支盘承担60%以上的桩顶荷载;盘间存在着应力叠加效应。并对盘与盘之间的最小临界间距提出建议。
Nonlinear finite element method is used to analyze the properties of pile-squeezed-branch cast-in-situ grouting pile and soil under load-bearing plate in the loess area. The load transfer characteristics and the bearing mechanism of the bearing plate are studied. Static field load test further shows The law of load transfer of the squeezed-expanded branch pile is gradually transferred from top to bottom, and the branch bear more than 60% of the top load of the pile. There is stress superposition effect between the plates. And make recommendations on the minimum critical distance between the disc and the disc.