CAJ | 학술논문

采用压汞法研究了不同固结压力作用下具有强结构性的珠海海积软土的微观孔隙入口孔径分布与应力水平的关系,通过X-射线衍射试验(XRD)对其黏土矿物含量进行定量分析,并与加拿大Regina黏土进行了对比.研究结果表明:珠海天然海积软土的孔隙入口孔径分布为主单峰分布;当应力水平小于结构屈服应力时,其孔隙入口孔径分布和微观结构与应力水平无关;当应力水平达到结构屈服应力时,大中孔隙(200 nm)的含量明显减少,而小孔隙(20～200 nm)含量则基本不变;在屈服后阶段,小孔隙含量锐减,整体孔隙空间的孔径趋于均匀.最后,初步分析了珠海海积软土和Regina黏土孔隙分布差异的原因是颗粒组成分布和黏土矿物成分的不同.
채용압홍법연구료불동고결압력작용하구유강결구성적주해해적연토적미관공극입구공경분포여응력수평적관계,통과X-사선연사시험(XRD)대기점토광물함량진행정량분석,병여가나대Regina점토진행료대비.연구결과표명:주해천연해적연토적공극입구공경분포위주단봉분포;당응력수평소우결구굴복응력시,기공극입구공경분포화미관결구여응력수평무관;당응력수평체도결구굴복응력시,대중공극(200 nm)적함량명현감소,이소공극(20～200 nm)함량칙기본불변;재굴복후계단,소공극함량예감,정체공극공간적공경추우균균.최후,초보분석료주해해적연토화Regina점토공극분포차이적원인시과립조성분포화점토광물성분적불동.
In this study, the mercury intrusion porosimetry (MIP) tests were performed on the natural marine clay to investigate the relationship between the change in entrance pore size distribution and the applied stress level. Quantitative analysis was made on clay mineral content of Zhuhai clay through X-ray diffraction tests (XRD). In addition, the measured data was compared to the experimental data obtained Regina clay,Canada. The results show that the entrance pore size distribution of marine clay in Zhuhai demonstrate a continuous unimodal distribution. And the entrance pore size distribution varies little when the stress level is smaller than the gross yielding stress, but changes significantly when the applied stress is in the vicinity of the gross yielding stress. In the latter case, the large pores(r>2 000 nm)and the medium pores(2 000 nm> r > 200 nm) become smaller while the micropores(200 nm> r>20 nm) vary little. When the applied stress is larger than the gross yielding stress, micropores space volume decreases rapidly, and the pore size gradually becomes uniform with the increase in applied stress level. Finally, the differences in pore size distribution between Zhuhai clay and Regina clay can be attributed to different clay content and mineral.