综合测井技术在太行山隧道勘察中的应用

研究目的:根据石太客运专线27.87 km长的太行山隧道洞身岩性以石灰岩、白云岩为主夹薄层角砾状泥灰岩、石膏岩及其次生的膏溶角砾岩,通过地区全部处于地下水的补给区,隧道区内断裂构造较发育,地下水较丰富的情况,在地质勘察阶段查明洞身岩层风化破碎程度、含水层及补给关系。研究方法:布置23个地质钻探孔,选择声波波速、视电阻率、自然电位、井温、井斜五个测试参数,同时以井中全景式彩色电视检测为补充,开展综合测井工作,采用概率统计方法对测试参数进行统计分析。研究结果:不同的岩性具有不同的概率曲线特征,灰岩、断层角砾岩、膏溶角砾岩离散度大,岩石破碎可能性大,对施工影响大。而鲕状灰岩、花岗片麻岩离散度小,岩石发生破碎的几率小。井中电视观测是对地下水出水情况进行判断最直接的方式。研究结论:采用上述方法可以准确判断岩层风化破碎程度、含水层及补给关系。

Application of the Comprehensive Logging Technology in Engineering Investigation of Mountain Taihang Tunnel

Research purposes : According to the Shitai passenger transportation special line 27.87 km long Mountain Taihang tunnel,the tunnel hole body rock character by the limestone,the dolomite primarily clamps the thin layer angle psephitic marl,the gypsum rock and the secondary paste dissolves the breccia,is in the ground water completely supplies area,the tunnel construction zone fracture structure more growth,fault zone and their impact more broken,more groundwater is rich.In geological prospecting phase to identify the tunnel body rocks weathering extent,aquifer and supply relations.Research methods: Arranging 23 geological drilling hole,choosing the acoustic velocity,the apparent resistivity,the self-potential,the bottom hole thermometer,the inclinometer five logging parameters and borehole televiewer to judges the rock layer,the paper uses the probability statistics methods to carry on the statistical analysis to the test parameters.Research results: Different variable probability curve with different characteristics,the limestone,the fault breccia,the paste dissolve the breccia relative dispersion to be big,the possibility of large broken rocks to the construction influential.But the oolitic limestone and the granite-gneiss relative dispersion is small.And the rock has the stave probability to be small.Borehole televiewer is the most direct way to determine groundwater supplies relations.Research conclusions: The method accurately makes decent the stave degree,the water-bearing stratum and the military supplies relations.