基于北京市门头沟区南段隧道拟建场地的工程地质条件研究

Study on engineering geological conditions of the proposed tunnel site in Mentougou District,Beijing

拟建区位于华北地台中部—燕山沉降带西段之西山凹陷内。为确保本次施工安全,对拟建场地内的工程地质条件进行了研究,旨在查明拟建区各岩土体特征及不良地质体。研究表明:区域构造发育,岩石节理发育,地下水以基岩裂隙水为主,富水性不均匀;拟建区岩土体类型较多,但各岩土体硬度较大,总体上对隧洞修建有利。研究结果可为进一步编制防治措施提供依据。

The construction area of proposed tunnel is located in the Xishan sag of the central part of the North China Platform and the western part of the Yanshan subsidence belt.In order to ensure construction safety,the engineering geological conditions of the proposed construction site were studied to find out the features of rock and soil bodies and bad geological bodies in the proposed construction area.The results showed that the regional structure was well developed,and the rock joints were also well developed.The groundwater was mainly bedrock fissure water,and the water abundance was not uniform.There are many types of rock and soil bodies in the proposed construction area,and they showed high hardness,which is beneficial to the tunnel construction on the whole.The research results provided a basis for further prevention and control.