摘要
选择瑶寨隧道大桥为研究对象,在结合现场勘查的基础上,针对YK47+540~510段和YK47+270~240段进行了探地雷达现场勘查和后期解读,对存在的不良地质体系和灾害类别防治进行分析,研究结果表明:YK47+538~YK47+535段整体围岩较为破碎,并有空腔型溶洞发育。隧道塌方预估量为15.96 m^3,属于一般塌方;YK47+270~240段掌子面6 m内有一典型的反射形态呈块碎状结构,计算隧道塌方量为125.35 m^3,属于严重塌方。针对YK47+538~YK47+535段选择采取"多打眼,少装药"爆破形式,YK47+270~240段采用弧形导坑法开挖形式,且掘进前沿设置小导管沿掌子面进行预注浆加固来满足隧道开挖稳定性的需求。
This article choose living in tunnel bridge as the research object, on the basis of combining with the on-site investigation, in view of the YK47 ＋ 540 - 510 period and YK47 ＋ 510 -270 spot investigation and the late period of the ground penetrating radar （GPR） , the existing system and poor ge- ological disaster prevention and control of category analysis, the results show that the YK47 ＋ 538 - ＋ 535 section of whole rock YK47 is broken, and be free cavity type cave development. A cave -in esti- mates for 15.96 m3 , belongs to the general collapse; Constraints YK47 ＋ 270- 240 period of 6 m is a typical reflection forms a piece of broken structure, calculation of tunnel landslide volume of 125.35 m3 , belongs to the serious landslide. For YK47 ＋ 538 - YK47 ＋ 535 section choose to punch more and charging less＂ form of blasting, YK47 ＋ 270 -240 period by using arc pilot tunnel excavation, and ad- vancing front set small catheter constraints along the grouting reinforcement to meet the demand of the sta- bility of tunnel excavation.
出处
《公路工程》
北大核心
2017年第4期285-289,316,共6页
Highway Engineering
基金
河北省高等学校科学技术研究项目(ZC2016129)
铁道部科技开发重点项目(2008G024-B)
