GZ25宁夏段黄土路基纵向开裂成因及防治方法研究

为了探讨湿陷性黄土地区高速公路的建设方法和经验,以GZ25宁夏段黄土路基纵向开裂破坏为实例,以室内试验及现场破坏路段解剖试验数据为依据,研究了湿陷性黄土的时空变化规律,并提出了湿陷性黄土地区道路线位选择的合理方法和湿陷路基的有效治理方案。研究认为:选择合理的路线线位,设计有效的排水系统,是避免路基湿陷性破坏的关键;湿陷性黄土的渗透规律是纵向大于横向,先期大于后期,野外实测值明显大于室内试验值,所以,对于路基湿陷性破坏评价和防治措施,应主要参考野外实测值;避免路基湿陷性破坏应以预防为主,治理黄土湿陷的关键是治水。

Study on the Cause and Way for Portrait Craze of Loess Roadbed in GZ25 Ningxia Section

In order to discussing the construction and experience of freeway in the area of loess with subsidability,the change regularity of the loess with subsidability is summarized according to the indoor and in-situ test data of an example of crack of loess roadbed,the rational way of alignment design and effective harness scheme of subsidability roadbed in the area of loess with subsidability is put forward.The key to avoid subsidability crack is to choose rational line location and design effective drainage system.The regularity of infiltration for loess with subsidability is that vertical infiltration more than horizontal infiltration and earlier stage more than later stage.The in-situ test values are more useful for evaluation and harness.