【作者】 唐毅；

【导师】 文江泉；

【作者基本信息】 西南交通大学 ， 地质工程， 2011， 硕士

【摘要】 岩溶在我国有着广泛的分布,其存在可能对铁路工程建设产生不良影响。在对南广铁路所经的岩溶发育区域,采用注浆的方式进行岩溶路基加固。电测深法是以地下不同介质的电性差异为物质基础,通过逐步改变供电电极距的大小的办法来控制勘探深度,由浅入深,了解一个测点地下介质电阻率的垂向变化的一类地球物理勘探方法。该法在南广铁路岩溶路基注浆效果检测试验中得到了应用。本文首先以该试验为背景,从电测深法的理论出发,对溶洞、破碎带上覆粘土,裂隙基岩上覆粘土、卵石土以及裂隙基岩上覆粘土三种不同地质条件下的测试结果进行了初步讨论。然后利用有限元工具ANSYS建立测试断面模型,对测试数据进行了二维反演,结合不同地质条件和注浆情况对注浆前后测试结果的变化进行了具体分析,进而对注浆的电测深法检测效果进行了评价。本文以测试结果为基本数据,有限元反演结果为分析依据,重点就不同地质条件下的电测深曲线类型,注浆前后视电阻率变化,注浆检测效果,注浆影响范围等进行了详细的讨论和分析。另外,根据分析结果,结合其他检测手段,提出了注浆后电测深法最佳检测时间为注浆后7-14天。同时建立了注浆检测效果评判标准,为：当注浆前后平均视电阻率变化率大于20%时,注浆效果“明显”；当该变化率小于10%时,注浆效果“不明显”；当变化率介于10%与20%之间时,注浆效果“较明显”。更多还原

【Abstract】 Karst in our country has a wide distribution, and its existence may adversely affect the construction of railway. In karstic areas of Nanning-Guangzhou railway, grouting was used to reinforce embankment. Resistivity sounding is a Geophysical exploration method which is based on the resistivity differences of under -ground mediums and gets resistivity vertical change by changing the electrode spacing. This method was used to detect the grouting quality.Based on test and resistivity sounding theory; it firstly discussed the test results in 3 diffierent Geological conditions which include caves covered by clays; Jointed rocks covered by clays and Pebbles; Jointed rocks covered by clays.Then it established models by the FEM tool ANSYS to make inversion of test data. Still it analysed the data changes before and after grouting, combined with geological and grouting conditions, then making evaluation of grouting quality which was tesed by resistivity sounding.In this paper, it focued on type of resistivity sounding curves, apparent resistivity changes before and after grouting, test results and influence scop of grouting by using test data and inversion results.Moreover, combined with analysis results and other test methods, it proposed the best detecting time after grouting to be 7～14 days.Meanwhile, evaluation standard of grouting quality which using resistivity sounding was estanded, when the changing rate of apparent resistivity before and after grouting is greater than 20%, the grouting effect grade is "significant"; when it is less than 10%,the grade is "less signifi-cant";when it is between 10% and 20%,the grade is "relatively significant"更多还原