成都理工大学硕士学位论文四川红层地区水-岩作用时效性研究姓名：王晓欣申请学位级别：硕士专业：地质工程指导教师：王运生20090501摘 要 i四川地区红层水四川地区红层水-岩作用时效性研究岩作用时效性研究 作者简介：王晓欣，女，1983 年 4 月生，师从成都理工大学王运生教授，2009 年 5 月毕业于成都理工大学地质工程专业，获得工学硕士学位 摘摘 要要 红层属于典型的层状岩体，其工程地质性质各向异性明显抗压、抗剪性均较差，力学强度低，遇水极易发生膨胀、软化和崩解，泥岩与水的长期作用还会产生泥化作用在一定程度上弱化泥岩的工程性状，降低红层边坡的稳定性，所以对红层水-岩作用时效性研究具有重要的现实意义本文通过对四川盆地红层库区岩样磨片试验、电镜扫描、崩解试验、力学试验和含水率试验的系统研究，揭示红层水-岩作用具有时效性，并得出以下几点认识： ⑴ 红层水-岩作用与其岩性及成分有关：以伊利石和蒙脱石为主要矿物的泥岩、粉砂质泥岩，具有较强的亲水性，在水的作用下容易发生物理及化学变化，即发生软化、泥化作用，这种作用的结果是弱化红层岩体的工程性状；而水对砂岩、粉砂岩的影响就相对较弱 ⑵ 红层浸水后具有崩解性：崩解速度与风化程度、岩性和浸水时间等因素有关。
崩解作用在强风化的泥岩中表现尤为突出，相反弱风化的泥岩崩解速度较慢；泥质含量较高的红层岩石的崩解速度较快，浸水后呈层状剥落，崩解现象明显，砂岩则崩解速度较慢 ⑶ 红层水-岩作用降低岩石的力学性质：试验揭示弱风化的红层岩石干抗压强度较高而饱水后及强度有较大幅度的降低，和前人的研究结果类似，软化系数为 0.5～0.55 左右 ⑷ 红层水-岩作用具有时效性：浸水时间越长，岩石强度降低越多，但有阶段性的发展，开始下降较快，后来趋于稳定总体上软化系数在 0.3～0.5 之间，经过 30～50 年水库浸泡后软化系数较目前在实验室测得的降低 10～20% ⑸ 红层地区长期蓄水的水库水-岩作用会降低其库岸边坡的稳定性因此，水岩作用会直接影响库岸边坡的长期稳定性， 本文所得的软化系数对库岸边坡的稳定性具有重要的参考价值 综上所述，水-岩作用的研究无论在理论上还是在工程实践上，都有其重要的意义， 特别是在水量充沛的红层地区 泥岩在水的作用下发生软化、 泥化作用，对岩体的工程性状及库岸坝基的工程稳定性都会造成威胁 本文主要是以试验的成都理工大学硕士学位论文 ii为主要的研究方法，通过对四个分区的泥岩进行试验，发现水对岩石在不同的浸泡年限内的影响不同，显示了其时效性的特点；水对不同岩性在同样浸泡年限内的影响也不同，显示了水-岩作用与岩性有关的特点；岩石在干湿交替作用后的加速破坏变化，显示了其崩解性的特点。
关键词：红层，泥岩，软化系数，水-岩相互作用，时效性 Abstract iiiEXPERIMENTAL RESEARCH ON THE EFFECT OF THE RED BEDS’ ROCK-WATER INTERACTION IN SICHUAN Introduction of the author: WANG Xiao-xin, female, was born in April, 1983 whose tutor was Professor WANG Yun-sheng. She graduated from Chengdu University of Technology in Geologic Engineering major and was granted the Master Degree in June, 2009. Abstract Red beds are typical of layered rock, the geological nature of the project clearly anisotropic. Compression, shear and are poor, low mechanical strength, high-risk expansion of water, softening and collapse of shale and water will have a long-term effect of the role of mud. Weakende to some extent, the project mudstone traits, reducing the stability of the red bed slope, so the red layer of water-rock interaction study of aging has important practical significance. In this paper, the red beds in the reservoir area of the Sichuan Basin grinding rock sample tests, scanning electron microscopy, disintegration testing, mechanical testing and moisture content of the system test, revealing the red layer of water-rock interaction with tme-sensitive, and understanding the following points: ⑴ The result of water-rock is related to lithology and its components:mudstone, clay and other rock soft rock in the water under high physical and chemical changes, mainly due to the kaolinite,illite and montmorillionite and other mineral-based, which has strong hydrophilicity, water infiltration in the circumstances of its structure easier to mud, and rock to soften the impact of its project to the overall stability, and water on sandstone, siltstone relatively weak impact on. ⑵ After the red layer with the collapse of water: the collapse of the speed and degree of weathering, lithology and water and time factors. Collapse of the role of weathering of mudstone in strong performance, particularly, on the contrary weak mudstone weathering the slow disintegration; higer clay content of the rocks of its rapid collapse, after the water was layered spalling, disintegration is obvious, and sandstone is a slow distintegration. ⑶ The water-rock interaction of red beds weak on the mechanical properties: weathering test revealed a weak stem red rock saturated with higher compressive 成都理工大学硕士学位论文 ivstrength and strength after a sharp reduction, and similar to previous findings, softening coefficient about 0.5～0.55. ⑷ The water-rock interaction of red beds has timeliness: the longer the water, the more lower rock strength, but the development stage, started to decline rapidly, then stabilized. Softening of the overall coefficient of between 0.3 to 0.5, after 30～50 years after the reservoir water softening coefficient than the current measured in the laboratory to reduce 10～20%. ⑸ Long-term storage of water in the reservoir area-rock slope will reduce the stability of reservoir banks. When full of water and low-flow changes in water level fluctuation, not only to changes in loads of rock, hollowed out so that it faces the danger of erosion of rock, the gap containing the water-based changes in the overall stability of the rock mass will also have effect, thus attecting the stability of the reservoir bank slope. To sum up, the water-rock interaction study of both theory and engineering practice, has its significance, especially in water abundant areas of red beds. Mudstone in the role of water under the softening, of the role of mud on the rock properties and reservoir banks of the foundation works of the project will pose a threat to stability. This article on a pilot study for the main method for the mudstones of the four sub-tests and found that water on the rock of immersion in the life of a different impact on different shows the characteristics of its timeliness; water of different lithologic immersion in the same impact on life is diff。