基床系数取值方法相关问题分析

Analysis on obtaining methods about the coefficient of subgrade reaction

根据基床系数的基本概念和工程意义,指出了基床系数测试方法、取值方法以及尺寸修正等方面存在的一些问题,指出应采用确定地基承载力的载荷试验方法测试基准基床系数,以及基床系数与路基系数之间在工程意义上的本质差别。提出进行基础结构设计时,应采用沉降观测结果得到的经验值或通过变形计算确定基床系数,特别是采用复合地基时必须采用这种办法。给出了北京地区几个典型复合地基工程基床系数的实测值。

According to the concept and engineering meanings of the coefficient of subgrade reaction,some questions about the test methods,obtaining methods and amend methods of size were put forward,and it pointed out that the test method of norm coefficient of subgrade reaction should be load test as the test method of subgrade bearing capacity,the intrinsical differences between the coefficient of subgrade reaction of the construction subgrade and the road were also presented.It was pointed out that the results of settlement observation or settlement calculation should be used to obtain the coefficient of subgrade reaction to design the foundation structure,it is necessary to take the method when the composite foundation is adopted.Some in-situ surveyed results of the coefficient of subgrade reaction of composite foundation in Beijing were figureed out.