南岸工作竖井与邙山临河高边坡稳定性分析

Analysis on stability of shaft well and Mangshan high slope at south bank of tunnel crossing Yellow River

南水北调中线穿黄隧洞南岸为邙山黄土边坡,黄河主河槽紧贴坡脚,河水冲刷和临河高边坡稳定直接关系到南岸盾构工作竖井施工期间的安全。对自然条件下、实施孤柏嘴护山湾控导工程后和南岸工作竖井建成后的3种工况的高边坡稳定性进行分析研究。研究结果表明:在自然条件下,由于黄河南岸为冲刷岸,邙山临河高边坡处于稳定或临界稳定状态,而孤柏嘴护山湾控导工程与南岸工作竖井的修建,提高了边坡的稳定性,可确保南岸竖井施工安全。

The Mangshan Mountain is located at the south bank of the tunnel crossing Yellow River,which has the factors such as main river channel clinging to the toe of the slope,river flow scouring and the high slope of the mountain have close relation with the safety of the shield tunnel shaft well in the south bank in its construction period.The stability of river-side Mangshan loess high slope under 3 working conditions are researched,including the natural condition,after the control and diversion works for Gubozui river bend and the shaft well built in the south bank.It is concluded that under the natural condition,the south bank of Yellow River is scoured and the Mangshan high slope located at the river-side is in a stable or critically stable state,the construction of control and diversion works for Gubozui river bend and the shaft well in the south bank will improve the slope stability and can guarantee the construction safety of the shaft well.