Study on preventing frost heave methods for highway foundation in seasonal frozen area

In order to resolve the frost-heave problem of highway foundation, firstly, the author discussed the law to frost heave of highway roadbed and gave an analysis on its influencing factors, such as soil, water and temperature. Meanwhile, sand clay and silt are given a classification according to frost heave ratio. Secondly, the roadbed frozen damage shows to frost heave and froze boiling based on the frost heave law and its influencing factors. In addition, taking some highway as an example and some principle suggestion was given through the theory on providing frostbite methods for highway foundation frost heave in seasonal frozen area. Specially, an effective method, STYROFOAM extruded polystyrene foam was introduced.     

山区公路软基病害研究

随着高等级公路建设规模的扩大，山区公路所面临的路基病害特别是软土路基病害问题也逐渐增多。结合对陕南勉(县)一宁(强)高速公路工程实例分析，对山区软土成因及其特性进行了初步分析，认为山区软土属以坡洪积、湖积和冲积为主的软土，也有少量是由坡残积物堆积而形成。山区软土的特殊性表现在成分的复杂性、分布的不均匀性、隐蔽性和物理力学性质的特殊性。根据其特性以及中国山区公路软基普遍存在的病害问题，总结了山区公路软基的主要病害类型为剪切拉裂破坏、浸水沉陷破坏、剥蚀坍塌破坏、推挤滑动破坏。还提出了相应的软基处理方法及建议。     

Study on the model for predicting soil erosion and its application in arid area

１　ＴＨＥＡＮＡＬＹＳＩＳＯＦＳＯＩＬＥＲＯＳＩＯＮＦＡＣＴＯＲＳＴｈｅｉｎｔｅｎｓｉｔｙｏｆｓｏｉｌｅｒｏｓｉｏｎｉｎａｒｉｄａｒｅａｖａｒｉｅｓｗｉｔｈａｌｔｉｔｕｄｅ,ｍｏｉｓｔｕｒｅａｎｄｈｅａｔｃｏｎｄｉｔｉｏｎａｎｄｓｕｒｆａｃｅｌａｙｅｒ（Ｃｈｅｎ,１９９５）．Ｉｎｍｉｄｄｌｅａｎｄｈｉｇｈｍｏｕｎｔａｉｎｓｅｃｔｉｏｎｓ,ｔｈｅｒｅｉｓａｌｉｔｔｌｅｍｏｒｅｐｒｅｃｉｐｉｔａｔｉｏｎ（４５０－７９６．９０ｍｍ）,ｒｉｃｈｅｒｖｅｇｅｔａｔｉｏｎｃｏｖｅｒｍｏｒｅｔｈａｎ６０ｐｅ…