摘要
针对原状黄土具有大孔隙的特点,对水玻璃自渗注浆加固原状黄土的可行性及加固效果进行研究.通过现场注浆试验,探究了水玻璃自渗注浆加固原状黄土的可行性并初步确定了加固影响范围.通过强度及水稳性试验,发现经自渗注浆加固后的原状黄土强度高、水稳性好.通过室内自渗注浆模型试验,发现自渗注浆半径随土体含水量的增大而减小,随土体孔隙比的增大而增大.对密度、含水量相同的原状黄土和重塑黄土分别进行水玻璃自渗注浆加固,试验结果表明,加固后原状黄土强度远大于重塑土,说明原状土原有的结构及贯通的大孔隙有利于提高自渗注浆效果.室内外试验结果表明,原状黄土经水玻璃自渗注浆加固后其强度和抗变形能力均大幅提高.运用渗流力学推导出自渗注浆柱形扩散公式,在可接受范围内,注浆半径和注浆量其理论计算值与实测值之间的差异分别约为25%和40%.
Studies in the feasibility and reinforced effect of sodium silicate self-permeated grouting in loess area have been carriedout on the basis of intact loess’s macropore characteristic. The reach of grouting and its feasibility can be acquired via field groutingtest. Through unconfined compressive strength and water stability test, the intact loess strength and water stability are well improved.From the laboratory self-permeated grouting model test, the grouting radius decreases with the increase of loess water content andincreases with the increase of void ratio. Under the condition of the same void ratio and near water contend, the intact loess strengthis far greater than structureless loess which shows that intact loess macropore contributes to the effect of self-permeated grouting.Laboratory and field test results show that reinforced intact loess has excellent strength and anti-deformability. Columnar diffusionequations for self-permeated grouting were established through mechanics of fluids in porous media. Within the acceptable range, thegrouting radius and amount from field test had respectively differences about 25%and40%to the calculated values with the proposedequation.
作者
金鑫
王铁行
于康康
罗扬
左腾飞
JIN Xin;WANG Tiehang;YU Kangkang;LUO Yang;ZUO Tengfei(College of Civil Engineering, Xi′an Univ. of Arch. & Tech., Xi′an 710055)
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2016年第4期516-521,共6页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
陕西省自然科学基金(2014JM7298)资助
西安建筑科技大学校人才基金(DB01158)资助
关键词
原状黄土
大孔隙
水玻璃
自渗注浆
无侧限抗压强度
水稳性
柱形扩散
intact loess
macropore
sodium silicate
self-permeated grouting
unconfined compressive strength
water stability
columnar diffusion
