干濕循環(huán)作用下紅粘土強度衰減特性及裂縫擴展規(guī)律研究
發(fā)布時間：2019-01-17 15:12
【摘要】：由于紅粘土具有高含水率、高塑性、高孔隙比等特殊的工程性質,在干濕循環(huán)作用和反復的交通荷載作用下紅粘土路基的長期強度和穩(wěn)定性下降,使得路基產(chǎn)生了一些病害。論文針對紅粘土路基病害的現(xiàn)象,以余慶至凱里高速公路路基填料為研究對象,以土質學土力學為理論基礎,以巖土工程測試技術為手段,通過現(xiàn)場調研、理論分析、室內外試驗,研究了紅粘土在干濕循環(huán)作用下強度衰減特性及裂縫的演化規(guī)律,揭示了紅粘土在干濕循環(huán)下的路用性能。研究取得了如下成果:(1)得出了自然狀態(tài)下紅粘土的基本物理指標和抗剪強度指標的變化規(guī)律;(2)得出了高溫和常溫下及不同干濕循環(huán)次數(shù)下剪應力—剪切位移關系、抗剪強度與垂直壓力關系以及抗剪強度指標(粘聚力和內摩擦角)與含水量,干密度以及循環(huán)次數(shù)之間的關系;(3)得出了高溫和常溫下及不同干濕循環(huán)次數(shù)下紅粘土抗剪強度指標的對比分析。(4)得出了干濕循環(huán)作用下紅粘土裂縫的演化規(guī)律。研究成果成果為邊坡的穩(wěn)定性驗算提供更加完善的技術指標,對紅粘土路用性能評價體系的完善具有重要的學術價值,對紅粘土地區(qū)的公路建設具有一定工程實際意義,并為其他行業(yè)提供技術借鑒。
[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.
【學位授予單位】：貴州大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU446
本文編號：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.
【學位授予單位】：貴州大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU446
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本文編號：2410173
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