Classification of tunnel surrounding rock is the basis of correct tunnel design and construction.The surrounding rock classification which corresponds to the actual condition of tunnel project has an important meaning for increasing the speed of tunneling and to ensure the quality of construction.It is quite normal to observe a disagreement between the surrounding rock exposure in the tunnel building and the given surrounding rock level during exploration period.On top of that,the complex geologic conditions may significantly vary the surrounding rock levels.To guarantee the both quality and progress of tunnel construction,it is required to further modify the surrounding rock levels.However,the existing standard classification methods require the indoor experiment.In addition,the on site experiment is not available.Hence,it is desirable to develop an on site method that is based on the current Code for Design of Road Tunnel and is capable to provide a rapid and accurate surrounding rock classification.Under the project context of sub tunnel of Ten-Day Mingyazi,this article rapidly classifies the tunnel surrounding rock with comprehensive field test measures such as digital point load test,digital photography and surrounding rock drilling endoscopic test.Practice has proved that the field test technologies for rapid classification of tunnel surrounding rock has important value in research on engineering application.

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我国西北地区公路建设中遇到的大厚度湿陷性黄上地基处理问题越来越多,因此消除黄土地基的湿陷性,降低路基工后沉降,提高承载力显得尤为重要。本文基于圆孔扩张理论,结合挤密桩在湿陷性黄土地区地基处理中的应用现状提出了一种新的施工工艺,并在西铜高速公路项目的实际应用中取得了显著的效果。

灌砂法是测定地基、路基现场压实度常用的方法之一。本文就其操作过程中容易产生误差的原因进行分析,并提出纠正措施,以供大家在试验工作中借鉴。

<正>"十一五"期间陕西交通事业,在陕西省委、省政府和省交通厅领导下,实现了3个重大的变化。第一,改变了陕西交通对经济社会发展的瓶颈制约状况。第二,这5年,全省公路固定资产投资完成数量达到1878亿元,仅高速公路的投资就在1300亿元以上。"十一五"之前全省高速公路修了1300公里,到"十一五"末已经达到3400公里。也就是说"十一五"期