黄原胶联合微生物加固改善混合砂蓄水特性试验研究

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中图分类号：TU411.91 文献标志码：A 文章编号：2096-6717（2025）03-0049-09

Improvement of water retention characteristics of mixed soils using XG-MICP

LIU Zhi'， YANG Yang

（1.China Ralway Construction Bridge Engineering Bureau Grouplst Engineering Co.，Ltd，Dalian116033， Liaoning，P.R. China;2.SchoolofCivil Engineering，Chongqing University，Chongqing 40o045，P.R.China

Abstract：With the development of marine industry，coastal sand and soil water retention has become an important technical link in the ecological recovery of islands and reefs.The efect of synergising xanthan gum （XG）with Microbially Induced Calcium Precipitation （MICP）on the water retention properties of silica sandcalciumcarbonate mixed sand was investigated by treating the sand with both XG and MICP simultaneously. A series of experiments including water retention，volume change，shear wave velocity and microscopic analysis were carried out to evaluate the treated sand at different concentrations of XG and MICP.The results showed that the water storage characteristics of thecured soil improved significantly with increasing Xanthan gum content and MICP concentration.Compared with the untreated sandy soil that produced a mass loss rate of 72.59% over 7d ， the mass loss rate of 5% 2.0 XG-MICP cured soil was only 13.1% ，which was reduced by a factor of about 81.95% . The rate of change in volume of the XG-MICP cured soil over the 7 d test days was less than that of the XG cured soil，and the XG-MICP cured soil had a higher volumetric stability.With the increase of xanthan gum concentration，the shear wave transmisson time of XG-cured soil was prolonged and the shear wave velocity decreased. Compared with XG-cured soil， XG-MICP-cured soil showed greater shear wave transmission time and smaler shear Wave velocity as afcted by moisture content.The pores of XG-MICP samples showed rhombic calcite precipitation.The experiment verified the feasibilityof using xanthan gum combined with MICP technique to improve the water storage of mixed sandy soils，which is expected to provide areference for improvement of sandy soils in coastal areas.

Keywords：microbially induced calcium precipitation （MICP）；xanthan gum；mixed sand；water retention characteristics;shearwavevelocitytest

在全球范围内，海岸地区正面临着复杂的气候变化和强风侵蚀的挑战[1-2]，其水土保持至关重要。（剩余12271字）