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对不同标准砂掺量的珊瑚砂进行微生物固化,通过对固化体的渗透特性、无侧限抗压强度、应力-应变曲线特征、抗拉强度和微观结构等方面的分析,研究砂掺量对珊瑚砂微生物固化效果的影响。试验结果表明:在相同条件下,不同砂掺量的珊瑚砂均可经微生物固化反应形成一个整体;随固化用砂中标准砂掺量的增多,试样的初始渗透性增大,固化周期变长;不同砂掺量试样的无侧限抗压强度应力-应变曲线均呈现为三段:压密阶段、塑性变形阶段和破坏阶段;微生物固化反应生成物对珊瑚砂包裹效果好,连接致密,排列规则,而对标准砂包裹效果差,排列松散;按这一规律适当比例混合珊瑚砂和标准砂可以改善固化体力学性能。试验中砂掺量为33.3%时抗拉强度达到最高;砂掺量为66.7%时无侧限抗压强度达到最高;砂掺量为50%时,试样的力学性能较差。
The coral sand with different standard sand content was subjected to microbial solidification. Based on the analysis of infiltration characteristics, unconfined compressive strength, stress-strain curve, tensile strength and microstructure of the solidified sand, Effect of coral sand microbial solidification effect. The experimental results show that under the same conditions, the coral sand with different sand dosages can be formed into a whole by the microbial solidification reaction. With the increase of the standard sand content in the sand for curing, the initial permeability of the sample increases, the curing cycle changes The stress-strain curves of unconfined compressive strength of specimens with different sand contents all showed three stages: compacting stage, plastic deformation stage and failure stage. The results of microbial solidified reaction products were good for coral sand packing, , The rules of arrangement, and the poor effect of standard sand package, arranged loose; according to this law the appropriate proportion of mixed coral sand and standard sand can improve the mechanical properties of cured body. In the experiment, the tensile strength reached the highest when the content of sand was 33.3%, the unconfined compressive strength reached the highest when the content of sand was 66.7%, and the mechanical property was poor when the content of sand was 50%.