Experimental study of the improvement of surrounding soils due to the grouting with a geotextile
Experimental study of the improvement of surrounding soils due to the grouting with a geotextile
复制标题
DOI：
10.1007/s11440-023-01855-y
复制
发表时间：
2023-03
期刊：
影响因子：
5.7
通讯作者：
Shenmin Zhang;W. Liu;Xinyu Ye;Yu Li;Yifan Shi;Shan-Shan Wang-Shan
中科院分区：
文献类型：
--
作者：
Shenmin Zhang;W. Liu;Xinyu Ye;Yu Li;Yifan Shi;Shan-Shan Wang-Shan
在锚杆支护系统中，一旦土工织物注浆提高了土体的强度，锚杆的拉拔力就会增加。为了研究土工织物灌浆对周围土体的改善效果，利用自行研制的土工织物灌浆装置，进行了不同初始压实度、不同含水率、不同土质类型等参数下的渗透渗透试验。此外，还进行了微观测试，以获得灌浆前后土壤的结构。主要结论如下：(1)土工织物注浆通过压实效应和浆液渗透作用提高了周围土体的强度，但其加固效果随着初始压实度的增加而逐渐下降。(2)随着初始含水率的增加，压实效应和粘性物质渗透所产生的加固效果减弱，但由于注浆过程中水分的渗透，土体强度的提高效率降低。(3)尽管由于泥浆(即水和粘性物质)入渗效率的不同，土工织物对不同土壤的灌浆效果也有明显差异，但无论是哪种土类，土工织物灌浆都能提高土体的强度，尤其是砂性土。(4)在土工织物的过滤作用下，由于粘性物质的积累，在灌浆土界面形成硬化层，有利于胶囊式锚杆等应用性能的提高。
In an anchor support system, once the soil strength is improved by grouting with a geotextile, the pull-out force of anchors increases. To investigate the improvement of surrounding soils due to the grouting with a geotextile, a series of filtration and penetration tests under various parameters such as different initial degrees of compaction, water content and soil types were conducted via a self-developed device. In addition, microscopic tests were then carried out to obtain the soil’s structure before and after grouting. The main conclusions are as follows: (1) The strength of surrounding soils is improved by grouting with a geotextile through the compaction effect and the slurry infiltration, while its strengthening effect gradually declines with the increase in the initial degree of compaction. (2) As the initial water content increases, the strengthening effect derived from the compaction effect and the cohesive substances infiltration decreases, while this improved efficiency of the soil strength declines due to the water infiltration during grouting. (3) Although the effect of grouting with a geotextile on different soils is obviously different due to the different efficiency of slurry (i.e., water and cohesive substances) infiltration, it can improve the soil strength regardless of soil type, especially for sandy soils. (4) Under the filtration of geotextile, a hardened layer is formed at the grout–soil interface due to the accumulation of cohesive substances, which is beneficial to the performance improvement in applications such as the capsule-type anchor.