The wide engineered application of compacted expansive soils necessitates understanding their behavior under field conditions.The results of this study demonstrate how seasonal climatic variation and stress and bounda...The wide engineered application of compacted expansive soils necessitates understanding their behavior under field conditions.The results of this study demonstrate how seasonal climatic variation and stress and boundary conditions individually or collectively influence the hydraulic and volume change behavior of compacted highly expansive soils.The cyclic wetting and drying(CWD)process was applied for two boundary conditions,i.e.constant stress(CS)and constant volume(CV),and for a wide range of axial stress states.The adopted CWD process affected the hydraulic and volume change behaviors of expansive soils,with the first cycle of wetting and drying being the most effective.The CWD process under CS conditions resulted in shrinkage accumulation and reduction in saturated hydraulic conductivity(k sat).On the other hand,CWD under CV conditions caused a reduction of swell pressure while has almost no impact on k sat.An elastic response to CWD was achieved after the third cycle for saturated hydraulic conductivity(k sat),the third to fourth cycle for the volume change potential under the CV conditions,and the fourth to fifth cycle for the volume change potential under the CS conditions.Finally,both swell pressure(s s)and saturated hydraulic conductivity(k sat)are not fundamental parameters of the expansive soil but rather depend on stress,boundary and wetting conditions.展开更多
三峡库区发育有大量三叠系巴东组第四段紫红色泥岩(T 2 b 4,简称为巴东组紫红色泥岩),受库水位升降的影响其强度易弱化而影响库岸边坡的稳定性,开展三峡库区巴东组紫红色泥岩强度弱化特性的研究可为相关工程地质条件的评价提供参考。首...三峡库区发育有大量三叠系巴东组第四段紫红色泥岩(T 2 b 4,简称为巴东组紫红色泥岩),受库水位升降的影响其强度易弱化而影响库岸边坡的稳定性,开展三峡库区巴东组紫红色泥岩强度弱化特性的研究可为相关工程地质条件的评价提供参考。首先,依次开展了干湿循环试验和三轴压缩试验,分析巴东组紫红色泥岩的强度弱化特性,并通过CT扫描试验观察试样表面与内部的细观损伤特性;其次,基于CT扫描重构模型,开展了考虑试样内部初始损伤的三轴压缩条件下数值模拟试验;最后,基于岩石的变形特征,提出考虑岩石变开过程压密阶段的能量消耗的一种新的能量耗散模型。试验结果表明:0~10 kPa预应力下的干湿循环试验只对试样表面粗糙度有轻微的影响;干湿循环条件下,试样的峰值强度和残余强度与干湿循环次数呈负线性相关;基于CT扫描重构模型的试样三轴压缩数值模拟试验结果与室内三轴压缩试验结果具有较好的一致性,能体现试样内部的初始损伤特性,更符合实际;改进后的能量耗散模型适合于分析考虑岩石压密阶段的变形过程。展开更多
Self-healing of engineered cementitious composites(ECC) subjected to a cyclic drying and wetting regime simulated summer outdoor environment was investigated in this paper.Uniaxial tension tests were used to generate ...Self-healing of engineered cementitious composites(ECC) subjected to a cyclic drying and wetting regime simulated summer outdoor environment was investigated in this paper.Uniaxial tension tests were used to generate multiple cracks in ECC specimens deformed to varying tensile strains.To quantify self-healing,resonant frequency measurements were conducted throughout drying-wetting cycles followed by tensile testing of self-healing ECC specimens.It was found that through self-healing the resonant frequency of ECC can recover 81% to 90% of initial values while showing a distinct rebound in stiffness of cracked ECC after self-healing.For specimens pre-loaded to high levels of strain between 2% and 3%,the tensile strain after self-healing can recover from 1.8% to 2.2%.Also,the effects of temperature during cyclic regime can lead to an increase in the ultimate strength of the material while slightly decreasing the strain-hardening capacity of ECC due to further hydration of unreacted cement and fly ash.展开更多
文摘The wide engineered application of compacted expansive soils necessitates understanding their behavior under field conditions.The results of this study demonstrate how seasonal climatic variation and stress and boundary conditions individually or collectively influence the hydraulic and volume change behavior of compacted highly expansive soils.The cyclic wetting and drying(CWD)process was applied for two boundary conditions,i.e.constant stress(CS)and constant volume(CV),and for a wide range of axial stress states.The adopted CWD process affected the hydraulic and volume change behaviors of expansive soils,with the first cycle of wetting and drying being the most effective.The CWD process under CS conditions resulted in shrinkage accumulation and reduction in saturated hydraulic conductivity(k sat).On the other hand,CWD under CV conditions caused a reduction of swell pressure while has almost no impact on k sat.An elastic response to CWD was achieved after the third cycle for saturated hydraulic conductivity(k sat),the third to fourth cycle for the volume change potential under the CV conditions,and the fourth to fifth cycle for the volume change potential under the CS conditions.Finally,both swell pressure(s s)and saturated hydraulic conductivity(k sat)are not fundamental parameters of the expansive soil but rather depend on stress,boundary and wetting conditions.
文摘三峡库区发育有大量三叠系巴东组第四段紫红色泥岩(T 2 b 4,简称为巴东组紫红色泥岩),受库水位升降的影响其强度易弱化而影响库岸边坡的稳定性,开展三峡库区巴东组紫红色泥岩强度弱化特性的研究可为相关工程地质条件的评价提供参考。首先,依次开展了干湿循环试验和三轴压缩试验,分析巴东组紫红色泥岩的强度弱化特性,并通过CT扫描试验观察试样表面与内部的细观损伤特性;其次,基于CT扫描重构模型,开展了考虑试样内部初始损伤的三轴压缩条件下数值模拟试验;最后,基于岩石的变形特征,提出考虑岩石变开过程压密阶段的能量消耗的一种新的能量耗散模型。试验结果表明:0~10 kPa预应力下的干湿循环试验只对试样表面粗糙度有轻微的影响;干湿循环条件下,试样的峰值强度和残余强度与干湿循环次数呈负线性相关;基于CT扫描重构模型的试样三轴压缩数值模拟试验结果与室内三轴压缩试验结果具有较好的一致性,能体现试样内部的初始损伤特性,更符合实际;改进后的能量耗散模型适合于分析考虑岩石压密阶段的变形过程。
文摘Self-healing of engineered cementitious composites(ECC) subjected to a cyclic drying and wetting regime simulated summer outdoor environment was investigated in this paper.Uniaxial tension tests were used to generate multiple cracks in ECC specimens deformed to varying tensile strains.To quantify self-healing,resonant frequency measurements were conducted throughout drying-wetting cycles followed by tensile testing of self-healing ECC specimens.It was found that through self-healing the resonant frequency of ECC can recover 81% to 90% of initial values while showing a distinct rebound in stiffness of cracked ECC after self-healing.For specimens pre-loaded to high levels of strain between 2% and 3%,the tensile strain after self-healing can recover from 1.8% to 2.2%.Also,the effects of temperature during cyclic regime can lead to an increase in the ultimate strength of the material while slightly decreasing the strain-hardening capacity of ECC due to further hydration of unreacted cement and fly ash.
