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软基上快速填筑路堤时的稳定控制十分重要。现行规范中采用了位移与位移速率作为控制标准,而实践证明,采用现行标准仍出现一些失稳事例,说明这些标准存在一定局限性,需加以改进。提出了临界状态线的概念,该临界状态线系基于多个工程观测的成果与离心模型试验所得数据,分别以道中沉降速率与坡脚水平位移速率作为坐标轴所得到的一条分界线。临界状态线将路堤的状态划分为稳定区域和非稳定区域,因而是个合适的控制指标。综合采用常用的道中沉降速率、坡脚水平位移速率2个指标以及附加的临界状态线指标,提出了改进的施工稳定控制标准,它比只考虑道中沉降和坡脚水平位移速率,更加符合路堤失稳机制。
It is very important to control the stability of soft embankment quickly. The current norms use the displacement and displacement rate as the control standard, and practice shows that the use of existing standards still appear some instability cases, indicating that these standards have some limitations, need to be improved. The concept of critical state line is proposed, which is based on the results of multiple engineering observations and the data obtained from the centrifuge model test. The boundary line between the sedimentation rate in the road and the horizontal displacement rate at the foot of a slope is taken as the coordinate axis respectively. The critical state line divides the state of a embankment into a stable area and a non-stable area, and is thus a suitable control index. Based on the commonly used two indexes of subsidence rate, horizontal displacement rate of slope foot and additional critical state line indexes, an improved control standard for construction stability is proposed, which is more in line with the horizontal displacement rate of subsidence and footing in the road, Steady mechanism.