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通过现场试验对比分析了双向水泥土搅拌桩和常规搅拌的桩身强度、复合地基承载力和路堤荷载下的沉降特性.在现场试验的基础上,以三维数值模拟对路堤荷载下双向搅拌桩和常规搅拌桩复合地基的工作性状进行了对比分析.结果表明,复合地基载荷试验因受荷载作用面积和时间的限制,影响深度浅,不能反映路堤荷载下的实际工作性状.与常规搅拌桩复合地基相比,双向搅拌桩由于桩身质量均匀,下部桩体强度较高,在路堤荷载作用下加固区下部的桩身荷载相对较大,而桩间土附加应力相对较小,从而减小了复合地基地表沉降和坡角侧向位移,即双向搅拌桩在提高工效的同时,提高了复合地基加固效果.
Through the field test, the pile body strength, the bearing capacity of composite foundation and the settlement characteristics under the embankment load were compared and analyzed.On the basis of field tests, the three-dimensional numerical simulation was carried out to analyze the effects of two-way mixing piles The results show that the load test of composite foundation is limited by the area and time of loading, and the depth of influence is shallow, which can not reflect the actual working behavior under the load of embankment.Compared with the conventional mixing pile composite foundation Compared with the two-way mixing piles, due to the uniform mass of pile body and high strength of the lower pile body, the load of the pile body in the lower part of the reinforcement zone is relatively large under the load of the embankment while the additional stress of the soil between the piles is relatively small, Ground subsidence and lateral displacement of slope angle, that is, two-way mixing pile to improve work efficiency at the same time, improve the composite foundation reinforcement effect.