Test on Compaction Reinforcement Effect of Sand
Test on Compaction Reinforcement Effect of Sand
复制标题
砂的压实加固效果试验
DOI：
10.1155/2020/3685619
复制
发表时间：
2020-10
影响因子：
--
通讯作者：
Hongbo Wang
中科院分区：
文献类型：
--
作者：
Lianzhen Zhang;Qingsong Zhang;Zhipeng Li;Hongbo Wang
在砂层劈裂或压密灌浆工程中，在浆液脉两侧或浆液球周围存在大量的压密砂区。压实后砂层的性能提高多少，对砂层的最终加固效果有重要影响。选取压缩模量、粘聚力和渗透系数作为砂土压实加固效果的性能指标。试验分析了砂的工作特性与注浆压力的关系。研究了粘土含量和砂的初始含水率对压实加固效果的影响。结果表明，压实能有效地改善砂土的力学性能和抗渗性能。砂土的压缩模量提高了2 × 18倍。粘聚力从9.4 ~ 113.6kPa增加到40 ~ 113.6kPa。砂的渗透系数从1.0 × 10−2 ~ 8.33 × 10−4 cm/s减小到2.19 × 10−4 ~ 2.77 × 10−9 cm/s。当砂中粘粒含量小于20%时，压实不能有效地加固砂。粘聚力不能显著提高，渗透系数不能显著降低。高初始含水率有利于提高压实砂的压缩模量，不利于提高压实砂的粘聚力。初始含水率对压实砂的渗透系数影响不大。最后，建立了定量描述不同注浆压力对砂土压实加固效果的拟合公式。
In fracture or compaction grouting projects of sand layer, there exist many compacted sand regions on both sides of grout veins or around grout bulbs. It has an important effect on the final reinforcement effect of the sand layer that how much performance of the sand layer is improved after being compacted. Compression modulus, cohesion, and permeability coefficient are selected to be the performance indexes of the compaction reinforcement effect of sand. The relationship between the performance properties of sand and grouting pressure has been tested and analyzed. And influences of clay content and initial water ratio of sand on the compaction reinforcement effect have been studied. Results show that compaction can effectively improve the mechanical properties and impermeability properties of sand. Compression modulus of sand increases by 2∼18 times. The cohesion of sand increases from the scope of 9.4∼26 kPa to the scope of 40∼113.6 kPa. The permeability coefficient of sand decreases from the scope of 1.0 × 10−2∼ 8.33 × 10−4 cm/s to the scope of 2.19 × 10−4∼2.77 × 10−9 cm/s. When the clay content of sand is smaller than about 20%, sand cannot be reinforced effectively by compaction. Cohesion cannot be improved significantly and the permeability coefficient cannot be reduced markedly. A high initial water ratio of sand is beneficial to improve the compression modulus of compacted sand and goes against the improvement of cohesion of compacted sand. In addition, the initial water ratio has little effect on the permeability coefficient of compacted sand. In the end, fitting formulas have been developed to quantitatively describe the compaction reinforcement effect of sand by different grouting pressures.
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影响因子：
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