论文部分内容阅读
针对混凝土芯水泥土搅拌桩处理深厚软土地基的工程实例,根据现场复合地基载荷试验结果,研究了混凝土芯水泥土搅拌桩复合地基的荷载传递规律、侧摩阻力分布特点和桩土应力比。测试结果表明:复合地基的上部荷载主要由混凝土芯承担,随着荷载的增加由混凝土芯→水泥土搅拌桩外壳→桩周土体扩散;施工过程中混凝土芯挤入改良了搅拌桩与土体间的接触性质,使得搅拌桩外壳与土体间的侧摩阻力要远大于规范推荐的水泥搅拌桩侧摩阻力计算值;混凝土芯与搅拌桩外壳之间接触紧密,保证了荷载的向外有效扩散;复合地基中桩土共同受力,能够同步发挥承载力。最后提出了混凝土芯水泥搅拌桩复合地基承载力计算方法。
According to the engineering example of deep soil foundation treatment with concrete-core cement-soil mixing piles, the load transfer law, lateral frictional resistance distribution and pile-soil stress ratio of concrete-filled cement-soil mixed piles composite foundation are studied according to the test results of composite foundation. The test results show that the upper load of the composite foundation is mainly borne by the concrete core and diffused by the concrete core → the shell of cement-soil mixing pile → the soil around the pile as the load increases; and the concrete core is extruded into the ground to improve the mixing pile and soil The contact resistance between the mixing pile shell and the soil is far greater than the calculated value of the side frictional resistance of the cement mixing pile recommended by the standard. The contact between the concrete core and the mixing pile shell is in close contact to ensure the effective outward load of the load Diffusion; pile composite soil in the soil together, can simultaneously display their bearing capacity. Finally, the calculation method of bearing capacity of composite foundation with concrete core cement mixing pile is put forward.