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基于一系列不同围压、不同含水率条件下的冻结砂土的三轴压缩试验,在一个宽泛的含水率范围内,研究了围压与含水率对冻结砂土破坏应变能密度的影响特性。试验结果表明:含水率为30.6%的冻土试样容易发生塑性破坏,其他含水率的冻土试样容易发生脆性破坏。围压对破坏应变能密度的影响可以分为低围压阶段、中围压阶段、高围压阶段,并且含水率对临界围压有重要影响。含水率对破坏应变能密度的影响也可以分为两种类型:当围压较低时(50 k Pa),随着含水率的增大,破坏应变能密度有一个初始增加的阶段,在含水率约为30.6%时破坏应变能密度达到最大值600 k Pa,之后随着含水率的继续增大,破坏应变能密度转而减小,达到60 k Pa后含水率的进一步增大不再影响破坏应变能密度,即此时冻土的破坏应变能密度接近于冰的破坏应变能密度;当围压较高时(大于等于500 k Pa),与低围压阶段相比,破坏应变能密度没有初始增加的阶段。
Based on a series of triaxial compression tests of frozen sandy soil with different confining pressures and different moisture contents, the effect of confining pressure and water content on the strain energy density of frozen sands is studied in a wide range of water content. The test results show that the frozen soil samples with 30.6% moisture content are prone to plastic failure, and the samples with other moisture content are prone to brittle failure. The effect of confining pressure on the strain energy density can be divided into low confining pressure stage, middle confining pressure stage and high confining pressure stage, and the moisture content has an important influence on the critical confining pressure. The effect of moisture content on the strain energy density can also be divided into two types: at low confining pressure (50 kPa), the initial stage of strain energy densification has an initial increase with the increase of water content, At a rate of about 30.6%, the maximum strain energy density reached 600 kPa. As the moisture content continues to increase, the detonation strain energy density decreases and the further increase of the water content after 60 kPa is no longer affected The strain energy density of the frozen soil is close to that of ice; when the confining pressure is higher (500 k Pa or more), the strain energy density There is no initial stage of increase.