盾构下穿建筑物区域HDD结合跨孔CT岩溶探测技术

Horizontal Directional Drilling Combined with Cross Hole Tomography Karst Detection Technology in Shield Tunneling Underneath Building Area

城市中地铁隧道下穿建筑物时,建筑物区域内的岩溶会对盾构下穿施工造成严重的不良影响,在施工前采用合适的岩溶探测技术准确探测岩溶发育情况是顺利下穿施工的关键之一。由于建筑物场地条件限制及附近金属管线、电磁干扰众多,钻探方法无法实施,常规物探方法精度难以保证。论文通过分析具体工程的场地条件及现有岩溶探测技术,提出水平定向钻进结合超声波跨孔CT岩溶探测技术,并从理论上分析了水平定向钻进结合超声波跨孔CT探测岩溶的可行性,该技术具有场地适用性强,抗干扰能力强,分辨能力高等特点。

When a subway tunnel in a city passes through a building,the karst in the building area will cause serious adverse effects on the tunneling of the shield.Precisely using the appropriate karst detection technology to accurately detect the karst development is one of the keys to successful under construction.Due to the limitation of building site conditions and the numerous metal pipelines and electromagnetic interferences nearby,drilling methods cannot be implemented,and the accuracy of conventional geophysical exploration methods is difficult to guarantee.By analyzing the site conditions of the specific project and the existing karst exploration techniques,this paper proposes a horizontal directional drilling combined with ultrasonic cross-hole CT karst detection technology,and theoretically analyzes the feasibility of horizontal directional drilling combined with ultrasonic cross-hole CT to detect karst.The technology has the characteristics of strong site applicability,strong anti-interference ability and high resolution capability.