粘土水泥浆液的压滤效应及其对强度的影响  

Pressure filtration effect of clay-cement grout and its influence on strength

作　　者：梁经纬[1,2] 宋子龙[1,2] 王祥[1,2] 张贵金[3] 

机构地区：[1]湖南省水利水电科学研究所,湖南长沙410007 [2]湖南省大坝安全与病害防治工程技术研究中心,湖南长沙410007 [3]长沙理工大学水利工程学院,湖南长沙410041

出　　处：《水利水电技术》2015年第10期133-137,共5页Water Resources and Hydropower Engineering

摘　　要：为了解粘土水泥浆液的压滤效应及其对浆液结石强度影响,研制了一种压滤效应模拟试验装置,并进行了一系列试验,结果表明:压滤系数对灌浆压力、粘土掺量和地层渗透系数的标准回归系数分别为1.32、1.11和0.4。浆液压滤过程呈现两个不同阶段,初期压滤曲线呈线性变化,后期压滤曲线呈指数变化。粘土水泥浆液相对于水泥浆液,压滤时间更长,滤水量稍有不同,压滤曲线分界点对应的压滤时间更短,压滤系数在0.1左右。粘土水泥浆液在压滤作用下具有良好稳定性;压滤效应对浆液结石强度影响显著,早期强度尤为明显,增长高达300%,终期强度增长近100%。此外,粘土水泥浆液灌浆设计时浆液配比选择应考虑压滤效应下的结石抗压强度。So as to understand the pressure filtration effect of the clay-cement and its influence on the strength of the grouted con- cretion, an experiment device for simulating its pressure filtration effect is developed. It is indicated after a series of experiments that the standard regression coefficients of the pressure filtration for the grouting pressure, clay mixing content and the strata per- meability coefficient are 1.32, 1.11 and 0. 4 respectively. The pressure filtration process of the grout shows two different stages, i.e. initial curve of pressure filtration presents a linear change and the later curve of pressure filtration presents an exponential change. Compared with the cement grout, the time for the pressure filtration of the clay-cement grout is longer and the water filte- ring quantity is slightly different with a shorter time of pressure filtration that is corresponding to the dividing point of the pressure filtration curve and a pressure filtration coefficient of about 0. 1. The clay-cement grout has a better stability under the effect of the pressure filtration, thus the influence from the pressure filtration on the grouted concretion is significant, especially for the rele- vant early strength, i.e. the increment is up to 300% at the early stage and is near 100% at the later stage. Additionally, the compressive strength of the grouted concretion under the pressure filtration must be considered during the design of the grouting with the clay-cement grout.

关 键 词：粘土水泥浆液 压滤效应 压滤试验 稳定性 强度 

分 类 号：TV44[水利工程—水工结构工程]