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灰土桩复合地基因桩体鼓胀变形使得桩间土体挤密,可以确定其挤密影响区范围,对评价地基加固效果有着十分重要的意义。采用统一强度理论,结合桩土变形协调条件,推导出复合地基沉降量与挤密影响区半径的关系式,并讨论不同b值、不同桩径d、不同深度条件下挤密影响区半径的变化趋势及影响特性。研究表明,挤密影响区半径随着地基深度的增加而减小,灰土桩最佳挤密深度范围为桩顶至1/3桩长深度之间;挤密影响区半径在1.51d～1.68d(d为桩径)之间,增大d可以有效扩大挤密影响区半径;应考虑中间主应力效应对岩土材料强度发挥的积极作用。
The deformation of piles in the composite foundation of lime-soil piles makes the soil between the piles squeeze, and the scope of the squeeze-affected zone can be determined. It is of great significance to evaluate the reinforcement effect of the foundation. Based on the unified strength theory and the coordination of pile-soil deformation, the relationship between the settlement of composite foundation and the radius of crushing zone is deduced. The variation of the radius of crush zone affected by different b values, different pile diameters d and different depths is discussed Trend and impact characteristics. The results show that the radius of the affected zone decreases with the increase of the depth of the foundation, and the optimum depth of the compaction depth of the pile is between the pile top and 1/3 of the pile depth. The radius of the confined zone is between 1.51 d and 1.68 d (d is the pile diameter). Increasing d can effectively enlarge the radius of the crushing zone. The positive effect of the middle principal stress on the strength of geomaterials should be considered.