干湿循环下不同风化程度泥质粉砂岩崩解特性试验研究
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摘要
为了研究干湿气候环境的变化对泥质粉砂岩崩解特性的影响,以新疆肯斯瓦特水利枢纽工程泥质粉砂岩为研究对象,通过室内模拟干湿淋水状态变化,对风化作用下的泥质粉砂岩进行崩解性和力学特性试验研究,结果发现:随着风化程度的加剧,泥质粉砂岩耐崩解性逐步减弱;循环崩解后,各粒径含量都呈现增加趋势,强风化的崩解速度和崩解含量高于风化程度低的岩石;风化作用促使泥质粉砂岩原生结构发生了改变,泥质物含量增加,使其强度和抵抗变形的能力降低。从崩解的微观机制上分析,黏土矿物含量、胶结物类型等对崩解的发生起了主导作用;风化作用促进了黏土矿物含量的增加,加速了崩解,不同风化类型导致崩解特性也出现差异性。
In order to study the effects of dry and wet climate changes on the disintegration characteristics of argillaceous siltstones,the argillaceous siltstones of the Kinswat Water Conservancy Project in Xinjiang were studied. We conducted the experimental study on the indoor disintegration and mechanical properties of argillaceous siltstones with different degrees of weathering by indoor simulation of dry and wet watering change conditions. The results showed that as the degree of weathering intensifies,the resistance to collapse of argillaceous siltstone gradually weakened. After the cycle disintegration,the particle size content increased. The disintegration rate and disintegration amount of strong weathering were higher than that of the rock with low weathering degree. The weathering action promoted the change of the original structure of argillaceous siltstone and the increase of muddy matter content. It reduces the strength and ability to resist deformation. From the microscopic mechanism of disintegration,the content of clay minerals and the type of cement played a leading role in the occurrence of disintegration. Weathering promotes the increase of clay mineral content and accelerates disintegration. Different weathering types lead to differences in disintegration characteristics.
In order to study the effects of dry and wet climate changes on the disintegration characteristics of argillaceous siltstones,the argillaceous siltstones of the Kinswat Water Conservancy Project in Xinjiang were studied. We conducted the experimental study on the indoor disintegration and mechanical properties of argillaceous siltstones with different degrees of weathering by indoor simulation of dry and wet watering change conditions. The results showed that as the degree of weathering intensifies,the resistance to collapse of argillaceous siltstone gradually weakened. After the cycle disintegration,the particle size content increased. The disintegration rate and disintegration amount of strong weathering were higher than that of the rock with low weathering degree. The weathering action promoted the change of the original structure of argillaceous siltstone and the increase of muddy matter content. It reduces the strength and ability to resist deformation. From the microscopic mechanism of disintegration,the content of clay minerals and the type of cement played a leading role in the occurrence of disintegration. Weathering promotes the increase of clay mineral content and accelerates disintegration. Different weathering types lead to differences in disintegration characteristics.
引文
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[4]张巍,尚彦军,曲永新,等.泥质膨胀岩崩解物粒径分布与膨胀性关系试验研究[J].岩土力学,2013,34(1):66-72+79.
[5]郭永春,谢强,文江泉.水热交替对红层泥岩崩解的影响[J].水文地质工程地质,2012,39(5):69-73.
[6]黄明,詹金武.酸碱溶液环境中软岩的崩解试验及能量耗散特征研究[J].岩土力学,2015,36(9):2607-2612+2623.
[7]邓涛,詹金武,黄明,等.酸碱环境下红层软岩-泥质页岩的崩解特性试验研究[J].工程地质学报,2014,22(1):238-243.
[8]邓涛,黄明,詹金武.不同p H环境下黏土类岩崩解过程分形演化规律[J].同济大学学报(自然科学版),2014,42(10):1480-1485.
[9]苏永华,赵明华,刘晓明.软岩膨胀崩解试验及分形机理[J].岩土力学,2005,26(5):728-732.
[10]吴道祥,刘宏杰,王国强.红层软岩崩解性室内试验研究[J].岩土力学与工程学报,2010,29(S2):4173-4179.
[11]曹运江,黄润秋,郑海君,等.岷江上游某水电站工程边坡软岩的崩解特性研究[J].工程地质学报,2006,14(1):35-40.
[12]杨建林,王来贵,李喜林,等.泥岩饱水过程中崩解的微观机制[J].辽宁工程技术大学学报(自然科学版),2014,33(4):476-480.
[13]刘长武,陆士良.泥岩遇水崩解软化机理的研究[J].岩土力学,2000,21(1):28-31.
[14]黄宏伟,车平.泥岩遇水软化微观机理研究[J].同济大学学报(自然科学版),2007,35(7):866-870.
[15]新疆玛纳斯河肯斯瓦特水利枢纽工程地质勘查项目组.新疆玛纳斯河肯斯瓦特水利枢纽岩土试验报告(初步设计阶段)[R].乌鲁木齐:新疆生产建设兵团勘测规划设计研究院,2009.