Organic matter content(wu)and water content(ω)greatly influence the mechanical properties and engineering characteristics of peat and peaty soil(peat soil for short).However,the determination standards of ω and wu of soil with high organic matter content are unclear in existing codes,procedures,and standards,and the test results vary greatly among different units.To define the determination standards of ω and wu of high organic content soil,tests were performed under different burning temperatures and burning times.Generally,the site of lacus-trine sedimentary soil in Dianchi Lake has 3-5 layers of peat soil.To explore the variation law and evolution mechanism of stress and strain under different buried depths and confining pres-sures,a series of triaxial consolidation undrained(CU)tests was performed on five layers of peat soil with different buried depths under low to high confining pressures.The test results show that the stress-strain curve of peat soil presents a"layered"phenomenon with increasing confining pressure;the strain corresponding to the maximum deviatoric stress decreases with increasing depth,and the curve shape changes with the confining pressure and buried depth of soil samples;the pore pressure coefficient decreases with increasing depth.Moreover,the control standard of failure strain of peat soil in the CU test is proposed.This research further deepens the under-standing of the mechanical properties of peat soil and provides an experimental basis for determi-ning ω and wu standards.
peat and peaty soil(peat soil for short)water contentorganic matter contentshear characteristics
万方数据
维普
