Development and Application of New Foam Agent for Sandy Gravel Soil Improvement
Sandy gravel soil is characterized by large internal friction angle,poor fluidity,large per-meability coefficient and low cohesion.In order to solve the problems such as difficult excavation and groundwater gushing caused by shield construction in sandy pebble stratum,a new type of foam improv-er formula"m(AOS)∶m(APG0810)∶m(HPMC)∶m(ammonium chloride)=4∶6∶1∶5"was obtained through surfactant compounding test,and the optimal foam concentration was 3％～5％.Based on the sandy gravel stratum of Shijiazhuang Rail Transit Line 5 Phase Ⅰ Project,sandy gravel soil with pebble content of 50％,60％and 70％was configured,and self-made foam agent and bentonite were added for improvement.It is found that with the increase of injection rate of the two modifiers,the slump of sandy gravel soil gradually increases,and the injection rate of the modifier for sandy gravel soil with different stone content meeting the requirements of"ideal soil mass"in shield construction is obtained,which provides a basis for the improvement of sandy gravel soil.
万方数据
维普
