摘要
针对富水破碎砂岩注浆止水效果难以逐点检测的问题,提出采用声波测井反演渗透性,对细部止水效果进行评价。基于Wyllie-Clemenceau波速-孔隙率公式以及Kozeny-Carman渗透方程,建立了富水砂岩波速-渗透率理论模型。以湖南某地基注浆工程为研究对象,采用岩心试验、声波测井以及压水试验,获取了注浆前、后岩心及岩层的波速和渗透率,通过拟合岩心数据,验证了波速-渗透率模型,并发现其存在以下规律:波速与渗透率呈非线性负相关,关系曲线具有明显的变化率分界点;注浆影响骨架波速与岩性指数。将测井波速反演的各测点计算渗透率与压水试验渗透数据对比,验证了模型在工程中的可靠性。以计算渗透率为基础,建立了富水砂岩注浆效果定量评价体系,并对案例进行了评价。
To address the difficulty in point-by-point detection of the grouting effect of water-rich broken sand strata,we propose to evaluate the detailed water-sealing effect of grouting via inversion of permeability using acoustic logging.On the basis of Wyllie-Clemenceau’s formula and Kozeny-Carman’s formula,we established an acoustic velocity-permeability model for water-rich sandstone.With a foundation grouting project in Hunan as research object,we obtained the acoustic velocity and permeability of rock core and rock strata before and after grouting through core test,acoustic logging,and hydraulic fracturing test.By fitting the core test results with the model,we found a nonlinear negative correlation between acoustic velocity and permeability with an obvious cut-off point of change rate in the curve.Grouting affects the rock matrix acoustic velocity and the exponent to the matrix nature.By comparing the permeability calculated by logging acoustic velocity with the hydraulic fracturing test results,we verified the reliability of the model.In addition,we built a quantitative evaluation system for the grouting effect of water-rich sandstone on the basis of calculated permeability,and evaluated the case using this system.
作者
陈宾
赵立权
胡惠华
姚盛丹
赵延林
刘通
CHEN Bin;ZHAO Li-quan;HU Hui-hua;YAO Sheng-dan;ZHAO Yan-lin;LIU Tong(Hunan Provincial Key Laboratory of Geomechanics and Engineering Safety, Xiangtan University, Xiangtan411105, China;Hunan Provincial Communication Planning Survey and Design Institute Co., Ltd.,Changsha 410008, China;Hunan Huaizhi Highway Construction Co., Ltd., Huaihua 418000,China;Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines,Hunan University of Science and Technology,Xiangtan 411201, China)
出处
《长江科学院院报》
CSCD
北大核心
2021年第7期73-79,87,共8页
Journal of Changjiang River Scientific Research Institute
基金
国家自然科学基金项目(51274097,51774131)
湖南创新型省份建设专项(2019RS1059)。
关键词
富水砂岩
注浆效果
波速
渗透性
声波测井
water-rich sandstone
grouting effect
acoustic velocity
permeability
acoustic logging
