洞口膨胀土滑坡桩基+横梁复合抗滑技术研究  

Study on composite anti-sliding technology of pile-beam of expansive soil landslide at tunnel entrance

作　　者：程鹏军 张光荣 Cheng Pengjun;Zhang Guangrong(China Water Resources and Hydropower Seventh Engineering Bureau Co.,Ltd.International Engineering Company,Chengdu Sichuan 610213,China)

机构地区：[1]中国水利水电第七工程局有限公司国际工程公司,四川成都610213

出　　处：《山西建筑》2024年第16期65-69,共5页Shanxi Architecture

摘　　要：山岭隧道洞口膨胀土滑坡在人工扰动和强降雨条件下极易出现失稳滑动趋势,是影响隧道施工安全的重要因素之一。雅万高铁4号隧道围岩成分复杂,膨胀特性明显,在隧道进口施工过程中受连续降雨影响造成洞口仰坡变形和拉裂,隧道拱顶大幅沉降和偏压变形。为保证隧道进洞安全,提出“桩基+横梁”洞口滑坡体加固措施,通过数值模拟与现场实测,验证了该加固技术可降低隧道拱顶沉降约85%,确定了桩基长度对加固效果的影响和桩长范围,有效降低了对隧道洞口仰坡的扰动。The expansive soil landslide at the entrance of mountain tunnel is prone to instability and sliding under the conditions of artificial disturbance and heavy rainfall,which is one of the important factors affecting the safety of tunnel construction.In order to ensure the safety of tunnel entrance,this paper puts forward the reinforcement measures of pile-beam portal landslide.Through numerical simulation and field measurement,it is verified that the reinforcement technology can reduce the settlement of tunnel vault by about 85%,and effectively reduce the disturbance to the slope of tunnel entrance.

关 键 词：山岭隧道 洞口滑坡体 膨胀土 围岩加固 

分 类 号：TU475.5[建筑科学—结构工程]