Li Dongliang, Liu Xinrong, Liu Xianshan
Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, China.
School of Civil Engineering, Chongqing University, Chongqing 400045, China.
Materials (Basel). 2015 Jul 2;8(7):3960-3974. doi: 10.3390/ma8073960.
Artificial cemented sand test samples were prepared by using ordinary Portland cement (OPC) as the cementing agent. Through uniaxial compression tests and consolidated drained triaxial compression tests, the stress-strain curves of the artificial cemented sand with different cementing agent contents (0.01, 0.03, 0.05 and 0.08) under various confining pressures (0.00 MPa, 0.25 MPa, 0.50 MPa and 1.00 MPa) were obtained. Based on the test results, the effect of the cementing agent content () on the physical and mechanical properties of the artificial cemented sand were analyzed and the Mohr-Coulomb strength theory was modified by using . The research reveals that when is high (e.g., = 0.03, 0.05 or 0.08), the stress-strain curves of the samples indicate a strain softening behavior; under the same confining pressure, as increases, both the peak strength and residual strength of the samples show a significant increase. When is low (e.g., = 0.01), the stress-strain curves of the samples indicate strain hardening behavior. From the test data, a function of (the cementing agent content) with ' (the cohesion force of the sample) and Δϕ' (the increment of the angle of shearing resistance) is obtained. Furthermore, through modification of the Mohr-Coulomb strength theory, the effect of cementing agent content on the strength of the cemented sand is demonstrated.
以普通硅酸盐水泥（OPC）作为胶结剂制备了人工胶结砂试验样品。通过单轴压缩试验和固结排水三轴压缩试验，得到了不同胶结剂含量（0.01、0.03、0.05和0.08）的人工胶结砂在不同围压（0.00MPa、0.25MPa、0.50MPa和1.00MPa）下的应力-应变曲线。基于试验结果，分析了胶结剂含量（）对人工胶结砂物理力学性能的影响，并利用对莫尔-库仑强度理论进行了修正。研究表明，当较高时（例如，=0.03、0.05或0.08），样品的应力-应变曲线呈现应变软化行为；在相同围压下，随着的增加，样品的峰值强度和残余强度均显著增加。当较低时（例如，=0.01），样品的应力-应变曲线呈现应变硬化行为。从试验数据中，得到了（胶结剂含量）与'（样品的内聚力）和Δϕ'（抗剪强度增量）的函数关系。此外，通过对莫尔-库仑强度理论的修正，证明了胶结剂含量对胶结砂强度的影响。
