人工冻融软黏土微观孔隙变化及分形特性分析

发布时间：2018-11-26 19:46

【摘要】：为探讨软黏土融沉及压缩特性的微观机理,以宁波地区软黏土为研究对象,采用冻融、压缩和压汞试验,对冻融和压缩前后的软黏土微观孔隙分布及变化进行了研究。取原状土、融土、压缩原状土、压缩融土4种土样分别进行压汞试验,提出孔径划分方法,结合分形理论对冻融软黏土微观孔隙变化进行分析,研究了软黏土的孔隙分布特征,并采用容量维数对孔体积分布和孔表面积分布进行计算,分析了冻融及压缩前后颗粒接触及孔隙变化。研究结果表明:软黏土冻融后孔体积和孔表面积均增大;原状土和融土压缩后孔体积和孔表面积均减小,软黏土的孔体积和孔表面积80%以上分布于微孔和超微孔中;软黏土冻融及压缩前后孔体积和孔表面积存在分形特性。
[Abstract]:In order to probe into the microscopic mechanism of thawing settlement and compression characteristics of soft clay, the micropore distribution and change of soft clay before and after freeze-thaw and compression were studied by freezing, thawing, compression and mercury injection tests. The mercury injection experiments were carried out on the samples of undisturbed soil, thawed soil, compressed undisturbed soil and compressed thawed soil respectively. The pore size partition method was put forward. The pore size variation of freeze-thawed soft clay was analyzed with fractal theory, and the pore distribution characteristics of soft clay were studied. The pore volume distribution and pore surface area distribution were calculated by capacity dimension, and the particle contact and pore changes before and after freeze-thaw and compression were analyzed. The results show that the pore volume and surface area of soft clay increase after freezing and thawing, the pore volume and surface area of undisturbed soil and thawed soil decrease after compression, and more than 80% of the pore volume and surface area of soft clay are distributed in micropores and ultrapores. The pore volume and surface area of soft clay are fractal before and after freeze-thaw and compression.
【作者单位】：南京林业大学土木工程学院;
【基金】：国家自然科学基金项目(51478226) 江苏省高校优势学科建设工程项目(PAPD) 江苏省普通高校研究生科研创新计划项目(KYLX15_0932)
【分类号】：TU442

【相似文献】