采用风积沙治理高速公路下伏采空区技术研究

榆神高速公路沿线存在大量的天然风积沙，利用风积沙填充采空区便成为一种经济环保的采空区处理方法。通过相关资料调查、井下测量、物探方法和钻探方法的综合应用，准确地掌握了采空区的大小、范围及埋深；从地表局部塌陷和上覆岩体整体下沉两方面进行检算，得出了一套采空区稳定性的综合评价方法；采用现场试验，开发了风积沙高速公路下伏采空区注浆投沙技术，平均投沙率为50.2%左右，大量降低了采空区整治成本；利用施工质量控制+高密度电阻率法+瞬变电磁法+钻孔取芯+压浆试验+全站仪+多点位移计，提炼出一套适合于采空区充填质量检测体

Technology Research for the Treatment of Mined-out area under Highway Using Aeolian Sand

There is a large number of natural aeolian sand along the line of Yulin-Shenmu Highway. Filling the mined-out area with aeolian sand has become an economic and environmental method for treatment. Through relevant data survey, downhole measurement and comprehensive application of geophysical method and drilling method, the size, scope and depth of mined-out area have been grasped accurately. From the aspects of local surface subsidence and overlying rock settlement, a compreh stability of mined-out area has been obtained through calculation. Through feeding ensive evaluation method for the site test, the grouting and sand technology for mined-out area under highway has been developed, with average sand feeding rate of about 50. 2 %, which largely reduced the treatment cost of mined-out area. By construction quality control, high-density resistivity method, transient electromagnetic method, core station and multi-point borehole extensometer, a filling quality detection been abstracted. drilling system , grouting test, electronic total suitable for mined-out area has