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现场施工过程中,往往需要对水泥固化土的无侧限抗压强度进行快速检测。针对目前水泥固化黏土无侧限抗压强度检测中存在的操作不简便、试验时间长、测试费用高等缺点,提出通过水泥土硬度估计强度的方法,对现场水泥土强度进行快速检测。本文以上海地区黏性土为研究对象,对上海地区水泥固化黏土强度与硬度的相关性进行了试验研究;探讨了加固土的硬度与养护时间、水泥掺量以及强度与硬度之间的关系。试验结果表明:上海黏土水泥土强度和硬度呈正比相关,对数坐标下的强度和硬度有着形如lnqu=ap+b的线性关系。养护初期,硬度增长速度大于水泥土强度增长速度。养护后期,强度增速大于硬度增速。
During on-site construction, unconfined compressive strength of cement-cured soil often needs to be quickly tested. In view of the shortcomings of unconfined compressive strength testing of cement-cured clay, such as inconvenient operation, long test time and high test cost, a method to estimate the strength of cement soil by cement hardness is proposed. In this paper, the cohesive soil in Shanghai is taken as the research object to study the relationship between the strength and the hardness of the cement-cured clay in Shanghai. The relationship between the hardness and curing time, the content of cement and the strength and hardness of the reinforced soil are discussed. The test results show that the strength and hardness of clay soil in Shanghai are directly proportional to each other, and the logarithmic coordinates have a linear relationship of lnqu = ap + b. In the initial stage of conservation, the growth rate of hardness is greater than the growth rate of cement soil strength. Conservation late, the intensity growth rate greater than the hardness growth.