关键词: 深厚复合软土地层;静止侧压力系数;快剪试验;三轴试验;

Abstract: The shear strength, compressive modulus and static lateral pressure coefficient are important mechanical parameters for the design and construction of deep buried diversion tunnels.By a large number of tests, the distribution characteristics of mechanical parameters of deep composite stratum in Kunming urban area, a part of water diversion project in central Yunnan, were researched, and the correlations of mechanical parameters by different tests were analyzed.The results show that the friction angle of soil tested by triaxial(UU)tests are smaller than that tested by rapid shearing tests, while the cohesion of soil tested by triaxial(UU)tests are larger than that tested by rapid shearing tests.Both cohesion and internal friction angle tested by the two kinds of tests have good linear relationship.When the buried depth of the stratum is shallow, the compressive modulus measured by the manometer test is similar to that measured by the consolidation test.When the buried depth of the stratum is large, the compressive modulus measured by the manometer test is smaller than that measured by the indoor consolidation test.The static lateral pressure coefficient K0 of stratum is not related to its depth.K0 is mainly affected by the properties of the stratum itself.The K0 value of the manometer test is similar to that of the laboratory test, which verifies the applicability of pressuremeter tests in deep composite soft stratum.

Key words: deep composite soft stratum; static lateral pressure coefficient; rapid shearing tests; triaxial tests;