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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。
In order to investigate the microcosmic mechanism of thaw settlement and compression characteristics of soft clay, the soft clay in Ningbo area was used as the research object. Freeze-thaw, compression and mercury intrusion tests were used to study the micro-pore distribution and change of soft clay before and after freeze-thaw and compression. Taking the original soil, thawing soil, compressed undisturbed soil and compressed thawing soil, the mercury injection tests were carried out respectively, and the method of pore diameter partitioning was proposed. In combination with the fractal theory, the micro-porosity change of frozen-thawed soft clay was analyzed, and the pore distribution of soft clay was studied. The characteristics of the pore volume distribution and pore surface area distribution were calculated using the capacity dimension, and the particle contact and pore change before and after freeze-thaw and compression were analyzed. The results show that the pore volume and pore surface area of soft clay increase after freezing and thawing; the pore volume and pore surface area of original clay and thawed soil are reduced, and the pore volume and pore surface area of soft clay are more than 80% distributed in micropores and In the micropores, the fractal properties of pore volume and pore surface area existed before and after freeze-thaw and compression of soft clay.