软土地层隧道围岩分区初期支护技术研究  

Study on the Initial Support Technology of Tunnel Surrounding Rock in Soft Soil

作　　者：高熙贺[1] GAO Xihe(Yangling Vocational and Technical College Traffic and Surveying Engineering Branch,Yangling 712100,China)

机构地区：[1]杨凌职业技术学院交通与测绘工程分院,陕西杨凌712100

出　　处：《粉煤灰综合利用》2024年第4期87-91,共5页Fly Ash Comprehensive Utilization

摘　　要：软土地层通常具有较低的承载力和较高的压缩性,隧道开挖过程中极易发生变形和坍塌。为了控制围岩的变形和破坏,确保施工安全,提出软土地层隧道围岩分区初期支护技术。通过合理规划围岩压力监测点,采集压力数据;利用简化的锚杆、钢架及岩体结构面,构建初期支护本构模型;计算锚杆与钢架的最佳间距和长度,并以此为依据设计复合支护结构,实现围岩分区初期支护。结果表明:所提方法隧道沉降位移较小、塑性区分布面积较小。体现了支护技术的有效性,具有较好的应用价值。Soft ground layer usually has low bearing capacity and high compressibility,collapse and deformation are very easy to occur during tunnel excavation.In order to effectively control the deformation damage of the surrounding rock and ensure the construction safety,the initial support technology for the surrounding rock of the tunnel in soft ground layer in zones is proposed.Pressure data are collected by reasonably planning the peripheral rock pressure monitoring points;Construct the initial support intrinsic model by using the simplified anchor rods,steel frame and rock structure surface;Calculate the optimal spacing and length of anchor rods and steel frames,and design the composite support structure based on them to realise the initial support in the surrounding rock zones.The results show that the proposed method of tunnel settlement displacement is small,and the distribution area of plastic zone is small.It reflects the effectiveness of the support technology and has good application value.

关 键 词：软土地层隧道 初期支护 围岩压力 锚杆应力 钢架应力 

分 类 号：U457[建筑科学—桥梁与隧道工程]