成都地区含膏红层软岩溶蚀特性研究

发布时间：2018-04-05 19:01

本文选题：含膏红层软岩　切入点：环境水　出处：《岩土力学》2015年S2期

【摘要】：针对成都地区红层软岩溶蚀空洞现象,以成都半岛城邦项目场地的红层软岩为例,选取不同深度的岩样进行室内浸水试验、淋滤试验和溶蚀试验,观察岩样在不同类型环境水下的作用性状和溶蚀特征,分析经历不同作用的含膏红层软岩可溶成分的流失程度及其对环境水的影响。结果表明,红层软岩中的石膏含量随着深度的增加而增加,含膏红层及其环境水的腐蚀性显著增强;遇水后,红层软岩中的可溶成分逐渐溶解、流失,随着时间的积累;红层软岩孔隙增大,渗透性增强,红层的完整性丧失,强度衰减;在酸性环境水的作用下红层软岩中的钙质胶结物流失加剧,结构连接破坏严重,对红层的结构强度影响较大。对浸泡、淋滤和溶蚀作用后的试样,重点测试了抗压强度、波速等参数。试验结果表明,红层软岩经硫酸溶液腐蚀后岩样的结构被破坏,单轴抗压强度从8.5 MPa降低到2 MPa,降低了76%;波速明显减小,从2 204 m/s减小至1 355 m/s,减小了40%;红层试样的p H与电导率变化也比较显著,p H值从8.77减小至7.29;电导率从55μs/cm增加到1 100μs/cm。
[Abstract]:Aiming at the phenomenon of red rock dissolution in Chengdu area in Chengdu peninsula city empty, the project site in red rock as an example, select the different depth of the rock samples indoor soaking test, leaching test and corrosion test, observation of samples in different types of water environment under the action of characters and dissolution characteristics, analysis of experience different paste containing red soft rock soluble component loss and its impact on water environment. The results showed that the content of gypsum in the red layer soft rock increase with depth, the corrosion of gypsum layer and red water environment significantly enhanced; water soluble component, red layer soft rock gradually dissolved, with the loss of the accumulation of time; red layer soft rock pore diameter and permeability increasing, the loss of integrity, red layer strength degradation; calcareous cement logistics in acidic environment under the action of water in red rock in loss intensifies, serious damage to the red connection structure The structural strength of layer influence. For soaking, leaching and dissolution of the samples, mainly test the compressive strength, velocity and other parameters. The experimental results show that the structure of red bed soft rock by sulfuric acid solution after corrosion specimen is damaged, the uniaxial compressive strength decreased from 8.5 MPa to 2 MPa, reduced by 76%; velocity decreased significantly, decreased from 2204 m/s to 1355 m/s, reduced by 40%; P H and conductivity changes of red layer samples is relatively significant, P H value decreased from 8.77 to 7.29; the conductivity increased from 55 s/cm to 1100 s/cm.

【作者单位】：西南交通大学土木工程学院;中国中铁二院工程集团有限责任公司;中国建筑西南勘察设计研究院有限公司;中建地下空间有限公司;
【分类号】：TU45

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