重庆老鼓楼衙署遗址强度劣化规律及渗水病害防治对策  

Strength deterioration pattern and anti-seepage measures of the Old Drum Tower Yamen site in Chongqing

作　　者：仉文岗 王硕 刘汉龙[1] 林思成 杨阳[1] 王鲁琦 张艳梅[2] ZHANG Wengang;WANG Shuo;LIU Hanlong;LIN Sicheng;YANG Yang;WANG Luqi;ZHANG Yanmei(Scholl of Civil Engineering,Chongqing University,Chongqing 400044,P.R.China;College of Aerospace Engineering,Chongqing University,Chongqing 400044,P.R.China)

机构地区：[1]重庆大学土木工程学院,重庆400044 [2]重庆大学航空航天学院,重庆400044

出　　处：《土木与环境工程学报（中英文）》2023年第5期26-36,共11页Journal of Civil and Environmental Engineering

基　　金：重庆市自然科学基金联合基金重点项目(2022NSCQ-LZX0001);大足石刻研究院横向项目(DZ-CG-20220325-1);重庆市技术创新与发展应用专项(JG2021072);重庆市科研机构绩效激励引导专项(cstc2021jxj00028)。

摘　　要：为研究饱水作用下石质遗址的力学强度劣化特征,掌握地下水的渗流迁移路径,多尺度联合开展室内微观试验、宏观试验和现场渗水检测。微观试验包括偏光显微镜、X射线衍射分析和孔隙度测试,宏观试验包括吸水试验和单轴抗压强度软化试验,现场检测主要采用高密度电阻法对含水岩层成像分析。岩相鉴定结果表明:整体岩性为砂质泥岩,矿物成分主要为石英、长石;黏土矿物以伊利石为主,则此类岩石抗干湿循环能力差;砂质泥岩饱和系数在0.84~1.00之间,软化系数在0.55~0.65之间,属于工程地质软岩,高软化性是地层结构变形的主要原因;地表水作用下泥岩裸露并产生构造裂隙,部分岩石表面出现盐析病害,渗流-应力耦合作用下坡体失稳变形;高密度电阻率法现场检测发现,地下水渗漏导致城墙遗址下呈现低阻带,电阻率在20Ω·m以下,主要为水渠渗水所致。建议对遗址地上和地下结构进行排水和防渗处理。In order to study the mechanical strength deterioration characteristics of the stone site under the effect of water saturation and to determinethe seepage and migration path of groundwater,lab micro-tests,macro-tests and field seepage tests are comprehensively conducted on multiple scales.The microscopic tests include polarized light microscope(PM),X-Ray diffraction(XRD)and porosity test,the macroscopic tests include water absorption test and uniaxial compressive strength softening test,and the on-site testing mainly adopts high-density resistance method to image and analyze the water-bearing rock layer.The petrographic identification results show that 1)the overall lithology is sandy mudstone,and the mineral composition is mainly of quartz and feldspar.Illite is the main clay mineral.This kind of rock has poor resistance to wetting and drying cycle.The saturation coefficient of sandy mudstone is between 0.84~1.00,and the softening coefficient is between 0.55~0.65,indicating a soft rock,and its high softening is the main reason for the deformation of formation structure.2)Under the action of surface water,the mudstone is exposed and tectonic fissures are formed,some rock surfaces are sabjected to salt precipitation problem,and the slope is unstable and deformed under the coupling action of seepage and stress.The field detection of high-density resistivity method shows that the groundwater leakage leads to a low resistance zonebelow,and the resistivity is below 20Ω·m,which is mainly caused by seepage of the canal.

关 键 词：石质遗址 强度软化 渗水病害 电阻法 

分 类 号：TU458[建筑科学—岩土工程]