横通道下穿重载景观石变形及加固技术研究

Research on the Deformation and Reinforcement Technology of Cross-passage Underground Heavy-loaded Landscape Stone at Close Range

本文以首都机场线二期(西延)工程北新桥站为例,探究北新桥站横通道近距离下穿地面重载景观石施工技术。根据现场施工条件,确定车站横通道下穿定点重大荷载的加固技术,并结合现场的监测数据观察景观石基础沉降,验证此加固技术的可行性。监测结果表明:D1、D2监测点地表沉降值在25~50d增长较快,增长约20mm;D3监测点地表沉降值在75~100d增长速率较快,达到了19mm;对于D4监测点进行三次注浆可提升到2.5mm,随后施工累计沉降值稳定在5~13.5mm,可知在加固措施中的后续注浆补充优化和景观石的整体加固,显得尤为重要,此建造技术对于类似工程具有借鉴意义。

This paper takes Beixinqiao Station of the second phase(west extension) project of the Capital Airport Line as an example to explore the construction technology of the cross passage of Beixinqiao Station underneath the ground heavy landscape stone at a close distance. According to the site construction conditions, the paper determines the station cross passage underneath the fixed point of major load Combined with the field monitoring data to observe the settlement of the landscape stone foundation, verify the feasibility of this reinforcement technology. According to the onsite construction conditions, the reinforcement technology of the heavy load at the fixed point under the station transverse passage is determined, and the settlement of the landscape stone foundation is observed in combination with the monitoring data on the site to verify the feasibility of this reinforcement technology. the moni toring results show that the surface subsidence value of D1 and D2 monitoring points increased rapidly during 25-50 days, with an increase of about 20 mm;the surface subsidence value of D3 monitoring point increased rapidly during 75-100 days, reaching 19 mm;D4 monitoring point can be raised to 2.5 mm after three grouting, and then the cumulative settlement value of the construction is stable at 5~13.5 mm. It can be seen that the subsequent grouting supplement optimization and the overall reinforcement of landscape stones in the reinforcement measures are particularly important. this construction technology provides a reference for similar projects.