孔隙水压对高强混凝土抗压性能影响的试验研究

发布时间：2018-09-03 18:49

【摘要】：为模拟深部井筒不同工作环境下高强混凝土力学性能,将高强混凝土试件浸没入不同高压(1、2、3、4 MPa)水体中48 h,以形成孔隙水压,并在TAW-3000试验机上进行单轴抗压试验,对孔隙水压作用后高强混凝土的抗压强度、弹性模量、峰值应变、体应变等指标的变化及其破坏形态进行了研究分析,并与未经水压作用的高强混凝土进行对比。研究结果表明,经孔隙水压作用后的高强混凝土应力-应变曲线和应力-体应变曲线的弹性极限提高了约10%。孔隙水压每提高1 MPa,高强混凝土的抗压强度损失率平均为2.93%、弹性模量损失率平均为2.96%。高强混凝土的开裂速度加快,脆性破坏特征更明显,且随着孔隙水压的增加,混凝土的抗压强度和弹性模量都表现出降低的趋势。
[Abstract]:In order to simulate the mechanical properties of high strength concrete (HSC) under different working conditions in deep wellbore, high strength concrete specimens were immersed in different high pressure water for 48 h to form pore water pressure, and uniaxial compressive tests were carried out on TAW-3000 tester. The change of compressive strength, elastic modulus, peak strain and bulk strain of high strength concrete after pore water pressure and its failure pattern are studied and analyzed, and the results are compared with those of high strength concrete without water pressure. The results show that the elastic limit of stress-strain curve and stress-body strain curve of high strength concrete under pore water pressure is increased by about 10%. The average loss rate of compressive strength and modulus of elasticity is 2.93 and 2.96 for every 1 MPa, increase of pore water pressure in high strength concrete. With the increase of pore water pressure, the compressive strength and elastic modulus of high strength concrete decrease.
【作者单位】：北京工业职业技术学院建筑与测绘工程学院;中国矿业大学(北京)力学与建筑工程学院;
【基金】：高等学校学科创新引智计划“111计划”资助项目(B14006) 国家重点研发计划资助项目(2016YFC0600903)
【分类号】：TD265.32

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