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通过对泥浆制样法制备的冻结粉质砂土的单轴压缩试验,系统地研究了冻结砂土在一个宽泛应变率以及含水率范围内的单轴压缩破坏应变特性和线弹模量特性。结果表明:随着应变率的增加,当含水率为12.0%,破坏应变逐渐增大;当含水率在16.7%~24.0%范围内时,破坏应变先增大后减小;当含水率大于等于30.6%时,破坏应变逐渐减小,3种情况下破坏应变最终都逐渐趋于稳定。破坏应变随含水率增加而先急剧增大到一个最大值,然后急剧减小,当含水率超过41.5%时,基本趋于冰的破坏应变。线弹模量先随着应变率的增大而非线性增大到一个最大值,然后应变率的继续增大使线弹模量逐渐减小,线弹模量与应变率的关系满足二次抛物函数规律。在温度为-2.0℃,应变率小于4.67×10-3 s-1的条件下,线弹模量随着含水率的增大而非线性增大,直至最后趋于冰的线弹模量;而在大于等于该应变率的条件下,随着含水率的增大,线弹模量先增大到一个最大值,然后减小趋于冰的线弹模量。当温度为-5.0℃时,类似的应变率临界值为1.00×10-2 s-1。
Through the uniaxial compression test of the frozen silty sand prepared by mud sample preparation method, the uniaxial compression failure strain and linear elastic modulus of the frozen sand in a wide range of strain rate and moisture content were systematically studied. The results show that with the increase of strain rate, the failure strain increases with the moisture content of 12.0%. When the moisture content is in the range of 16.7% ~ 24.0%, the failure strain first increases and then decreases. When the moisture content is greater than or equal to At 30.6%, the failure strain gradually decreased. In the three cases, the failure strain finally stabilized. The failure strain increases sharply to a maximum value with the increase of water content, and then decreases sharply. When the moisture content exceeds 41.5%, the failure strain basically tends to ice. The linear elastic modulus firstly increases non-linearly to a maximum with the increase of strain rate. Then the strain rate continues to increase to decrease the linear elastic modulus. The relationship between linear elastic modulus and strain rate satisfies the quadratic parabola Function law. Under the conditions of temperature of -2.0 ℃ and strain rate of less than 4.67 × 10-3 s-1, the linear elastic modulus increases nonlinearly with the increase of water content until the linear elastic modulus of ice reaches finally. However, at or above this strain rate, as the moisture content increases, the linear elastic modulus first increases to a maximum, and then decreases the linear elastic modulus that tends to ice. A similar strain rate cut-off of 1.00 × 10-2 s-1 at -5.0 ° C.