颗粒细观参数空间变异性对致密土体劈裂注浆过程的影响研究OA
Effect of spatial variability of particle micro-parameters on the fracturing grouting process of dense soil
利用 MATLAB与PFC2D随机离散元模拟方法,采用 Karhunen-Loève(K-L)展开方法建立粒间接触法向黏结强度的随机场模型,以土体孔隙率变化作为主要判断依据,研究了接触法向黏结强度空间变异性对致密土体劈裂注浆过程的影响并进行注浆结果分析.研究结果表明:当注浆压力为0.5 MPa时,主要影响范围的两个监测圆(r=1.0、2.0 m)内,土体孔隙率变化规律与接触法向黏结强度不确定性密切相关,起始注浆时段随机模拟的孔隙率变化曲线基本重合,持续注浆时段曲线开始发散;法向黏结强度的空间分布也会引起劈裂裂缝的数量与形成时间不同,对初始裂缝生成的位置几乎无影响.
Based on the random discrete element method of MATLAB and PFC2D,the random field model of in-tergranular contact normal bond strength was established by Karhunen-Loève(KL)expansion method.Ac-cording to the variation of soil porosity,the effect of spatial variability of contact normal bond strength on the grouting process of dense soil was studied.When the grouting pressure is 0.5 MPa,the variation of porosity and the cracking result in the two monitoring circles(r=1.0,r=2.0m)of the main influence range is shown.The results indicate that the variation of soil porosity of dense soil is closely related to the uncertainty of con-tact normal bond strength during splitting grouting.The spatial distribution of normal bond strength also cau-ses split cracks.The difference between the quantity and the formation time has almost no effect on the posi-tion at which the crack originated.
黄烨迪;彭浩洋
中国电建集团成都勘测设计研究院有限公司,四川 成都 611130雅砻江流域水电开发有限公司,四川 成都 610051
建筑与水利
劈裂注浆离散元空间变异性随机场接触法向黏结强度
fracturing groutingdiscrete elementspatial variabilityrandom fieldcontact normal bond strength
《四川水力发电》 2026 (2)
130-135,6
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