干湿循环作用下红粘土强度衰减特性及裂缝扩展规律研究
发布时间：2019-01-17 15:12
【摘要】：由于红粘土具有高含水率、高塑性、高孔隙比等特殊的工程性质,在干湿循环作用和反复的交通荷载作用下红粘土路基的长期强度和稳定性下降,使得路基产生了一些病害。论文针对红粘土路基病害的现象,以余庆至凯里高速公路路基填料为研究对象,以土质学土力学为理论基础,以岩土工程测试技术为手段,通过现场调研、理论分析、室内外试验,研究了红粘土在干湿循环作用下强度衰减特性及裂缝的演化规律,揭示了红粘土在干湿循环下的路用性能。研究取得了如下成果:(1)得出了自然状态下红粘土的基本物理指标和抗剪强度指标的变化规律;(2)得出了高温和常温下及不同干湿循环次数下剪应力—剪切位移关系、抗剪强度与垂直压力关系以及抗剪强度指标(粘聚力和内摩擦角)与含水量,干密度以及循环次数之间的关系;(3)得出了高温和常温下及不同干湿循环次数下红粘土抗剪强度指标的对比分析。(4)得出了干湿循环作用下红粘土裂缝的演化规律。研究成果成果为边坡的稳定性验算提供更加完善的技术指标,对红粘土路用性能评价体系的完善具有重要的学术价值,对红粘土地区的公路建设具有一定工程实际意义,并为其他行业提供技术借鉴。
[Abstract]:Due to the special engineering properties of red clay, such as high moisture content, high plasticity and high void ratio, the long-term strength and stability of red clay roadbed decreases under the action of dry and wet circulation and repeated traffic loads, which results in some diseases of the roadbed. Aiming at the phenomenon of red clay roadbed disease, taking the filling material of Yuqing to Kaili expressway as the research object, taking soil mechanics as the theoretical foundation and geotechnical engineering test technology as the means, the paper makes theoretical analysis through field investigation. The characteristics of strength attenuation and fracture evolution of red clay under dry and wet cycle were studied in indoor and outdoor tests. The road performance of red clay under dry and wet cycle was revealed. The results are as follows: (1) the basic physical indexes and shear strength indexes of red clay under natural condition are obtained. (2) the relationship between shear stress-shear displacement, shear strength and vertical pressure, shear strength index (cohesion and angle of internal friction) and water content are obtained under high temperature and normal temperature and different times of dry and wet cycles. The relationship between dry density and the number of cycles; (3) comparison and analysis of shear strength index of red clay under high temperature and normal temperature and different times of dry and wet cycles. (4) the evolution law of red clay crack under dry and wet cycle is obtained. The research results provide a more perfect technical index for the stability checking calculation of the slope, have important academic value for the improvement of the evaluation system of the road performance of the red clay, and have certain engineering practical significance for the highway construction in the red clay area. And for other industries to provide technical reference.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU446
本文编号：2410173
[Abstract]:Due to the special engineering properties of red clay, such as high moisture content, high plasticity and high void ratio, the long-term strength and stability of red clay roadbed decreases under the action of dry and wet circulation and repeated traffic loads, which results in some diseases of the roadbed. Aiming at the phenomenon of red clay roadbed disease, taking the filling material of Yuqing to Kaili expressway as the research object, taking soil mechanics as the theoretical foundation and geotechnical engineering test technology as the means, the paper makes theoretical analysis through field investigation. The characteristics of strength attenuation and fracture evolution of red clay under dry and wet cycle were studied in indoor and outdoor tests. The road performance of red clay under dry and wet cycle was revealed. The results are as follows: (1) the basic physical indexes and shear strength indexes of red clay under natural condition are obtained. (2) the relationship between shear stress-shear displacement, shear strength and vertical pressure, shear strength index (cohesion and angle of internal friction) and water content are obtained under high temperature and normal temperature and different times of dry and wet cycles. The relationship between dry density and the number of cycles; (3) comparison and analysis of shear strength index of red clay under high temperature and normal temperature and different times of dry and wet cycles. (4) the evolution law of red clay crack under dry and wet cycle is obtained. The research results provide a more perfect technical index for the stability checking calculation of the slope, have important academic value for the improvement of the evaluation system of the road performance of the red clay, and have certain engineering practical significance for the highway construction in the red clay area. And for other industries to provide technical reference.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU446
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本文编号：2410173
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