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对一初始直径0.76m、桩长5.05m的夯扩碎石桩单桩建立数值模型,精确模拟其夯扩和载荷试验分级加载过程,并对同一直径和桩长的未夯扩碎石桩进行了数值模拟以作比较分析。计算和实测的夯扩碎石桩桩顶和桩端荷载–沉降曲线吻合很好。未夯扩与夯扩碎石桩桩顶沉降比值在1.8～10.7之间,而两者的桩端沉降量都很小。未夯扩碎石桩桩身侧向膨胀比相同荷载下的夯扩碎石桩大很多。夯扩碎石桩桩身轴力沿深度衰减幅度较大;而未夯扩碎石桩当桩顶荷载较大时,由于桩身侧向膨胀增大,桩身侧摩阻力也随之增大,桩身轴力则表现为沿深度衰减幅度逐渐增大。
A numerical model of rammed-expanded gravel pile with an initial diameter of 0.76m and a pile length of 5.05m was established to accurately simulate the process of ramming expansion and load test grading and loading. The ramless expanded stone piles with the same diameter and pile length Numerical simulation for comparative analysis. The calculated and measured tillage-detritus pile top and pile-end load-settlement curve are in good agreement. The ratio of settlement of unconfigurable expansion to tamper detritus pile is between 1.8 and 10.7, and the settlement of both ends is very small. Lateral expansions of the un-rammed crushed-stone pile are much larger than those of the rammed-expanded gravel pile under the same load. When the load of un-rammed crushed stone piles is large, the lateral friction of pile body increases with the increase of lateral expansion of pile body , While the axial force of the pile shows the gradual increase of attenuation along the depth.