ESTIMATION OF IN-SITU STRENGTH OF CEMENT-TREATED SOILS BASED ON A TWO-PHASE MIXTURE MODEL
ESTIMATION OF IN-SITU STRENGTH OF CEMENT-TREATED SOILS BASED ON A TWO-PHASE MIXTURE MODEL
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基于两相混合模型的水泥处理土原位强度估算
DOI：
10.3208/sandf.38.4_17
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
N. Yoshida
中科院分区：
文献类型：
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作者：
K. Omine;H. Ochiai;N. Yoshida
在考虑混合材料的应力分布和应变能的基础上，提出了一种预测不同材料混合材料应力-应变关系的两相混合模型。用该模型估计了两种不同弹性材料混合材料的弹性模量，并与其他理论计算结果和实验结果进行了比较，验证了该模型的有效性。将原位水泥土视为一种由改良部分和未改良部分组成的两相混合体，并将所建立的模型应用于这种原位水泥土。处理过的土壤的混合水平是用从采样样本横截面上的改进区域获得的改进率来评估的。基于两相混合模型，推导了不同改良率下原位处理土的变形模量和无侧限抗压强度。为了验证所提方程的有效性，进行了模拟现场实际搅拌过程的室内模型试验，并将计算结果与试验结果进行了比较。现场改良试验的结果也验证了所提出的原位强度估算公式。
A two-phase mixture model for predicting the stress-strain relationship of mixtures with different materials is proposed based on consideration of the stress distribution and strain energy in the mixture. Elastic moduli of mixtures with two different elastic materials are estimated by the proposed model and its validity is confirmed by comparing with the calculated results from other theories and the experimental results. In-situ cement-treated soils are regarded as a kind of two-phase mixture consisting of improved and unimproved parts, and the proposed model is applied to such in-situ treated soils. A level of mixing of the treated soils is evaluated using the improvement rate obtained from the improved area in a cross section of sampling specimen. Deformation modulus and unconfined compressive strength of the in-situ treated soil with different improvement rates are derived based on the two-phase mixture model. In order to confirm the validity of the proposed equations, laboratory model tests simulating the actual mixing process at site were conducted and the calculated results were compared with the test results. The proposed equation for estimating the in-situ strength of the treated soils was also verified by the results of the in-situ improvement tests.