基于地质编录和探地雷达的隧道断层破碎带超前预报技术

Advance forecast of tunnel fault fracture zone based on geological logging and ground penetrating radar

为了提高断层破碎带的地质预报判读精度,提出了一种基于地质编录与探地雷达相结合的综合超前预报技术。以广西六寨至宜州高速公路关西隧道为依托,通过分析区域地质资料获得地质编录信息并提出预报方案;依据局部揭露不良地质体的产状、分布位置等,通过倾角变换计算其边界范围和影响长度;当接近断层破碎带及受其影响的地质地段时,采用探地雷达实施更精细准确的短距离预报。结果表明,探地雷达能较为准确地识别出破碎带及其影响范围内围岩的破碎性、富水性、不良填充体等微观“病灶”,与宏观地质编录分析相结合能较为准确地对断层破碎带实施预报。

In order to improve the geological forecast explanation precision of the fault fracture zone, the synthetic advanced forecast technology based on geological logging and GPR (ground penetrating radar) was introduced. On the basis of Guanxi tunnel of Liuzhai-Yizhou expressway in Guangxi Zhuang Autonomous Region, the geological logging information was acquired and the forecast scheme was proposed according to the analysis of the regional engineering geology data. Meanwhile, according to the occurrence and the location of adverse geological body which has been partially exposed, the border and influence length was calculated through angle conversion. When getting close to the fault fracture zone and the geological area affected by it, the more accurate and short distance forecasts were applied as GPR. The facts and figures show that the GPR can accurately identify microscopic "lesions" such as the crumbliness, water-rich property and poor filling body of the fault fracture zone and the surrounding rocks within its impact range, and it can accurately predict the fault fracture zone by combination with the macro geological catalog analysis.