洞庭湖區(qū)淤泥質(zhì)土水泥土強度特性研究
[Abstract]:In this paper, the silt soil in Dongting Lake area is used as the raw material, and by using the technical principle of cement strengthening soft soil, through indoor test, the construction parameters of cement soil to meet the engineering needs are obtained, which provides the basis for engineering practice. The main research work in this paper is: 1. Through the mixed homogeneous test of cement-soil, several main factors affecting the unconfined compressive strength of cement-soil are studied, and the unconfined compressive strength of cement-soil is obtained with the ratio of cement to cement, moisture content and sand content. Through the triaxial test of cement soil, the stress-strain curves of cement with different cement ratio, curing age and confining pressure were studied, and the strength of cement soil with cement mixing ratio was obtained. Changes of age and confining pressure. The failure type of cement-soil is brittle failure. 3. Taking a dyke project in Dongting Lake area as an example, according to the results of indoor test, the field load test results show that the design parameters provided in this paper can guide the engineering practice. The bearing capacity of the treated foundation meets the requirements. According to the research and analysis of the results of laboratory tests, the following main results are obtained: 1: 1. When the ratio of cement to cement is between 6 and 16, the unconfined compressive strength of the cement soil increases linearly with the ratio of cement to cement, and the strength increases by 56 ~ 87 KPA with the increase of the ratio of cement to cement. When the ratio of cement to soil is less than 10, the strength of cement-soil increases slowly and then increases more quickly. When the ratio of cement to soil is greater than 14, the strength of cement-soil increases slowly. The ratio of cement to soil has a significant effect on the strength of cement-soil, but other factors have no significant effect. The peak strength of cement-soil increases with the increase of cement ratio. With the increase of cement ratio, the increase of peak strength of cement-soil is between 60kPa~360kPa. At the same cement ratio, the increase of peak strength of cement-soil increases with the increase of confining pressure, and its value is between 170kPa~120kPa. When the peak stress of cement soil appears, the strain value of cement soil is between 2.1% and 3.6%. The influence of confining pressure on cement soil strength at old age is greater than that at low age. The strength characteristic of cement soil pile under compression is related to the confining pressure provided by surrounding soil, and the larger the confining pressure is, The more the strength of cement soil can be developed.
【學位授予單位】:湖南工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TU43
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