粗颗粒盐渍土室内溶陷装置设计及试验研究
Design and experimental study on the indoor collapsibility device of coarse grained salty soil

针对粗颗粒盐渍土溶陷系数的测试局限于现场浸水载荷试验，常规的室内溶陷系数测试方法不能满足试验要求的问题，介绍一种针对粗颗粒盐渍土溶陷系数的室内测试方法，克服了现有方法颗粒容积比低、受边界条件影响大的不足，并通过对室内外试验结果的对比分析，讨论粗颗粒盐渍土的溶陷特性及影响因素。研究结果表明：对于粗颗粒盐渍土，易容盐含量的提高会在一定程度上增强其溶陷特性；中溶盐的胶结作用会提高粗颗粒盐渍土的整体性及强度，但在浸水加载条件下，高中溶盐含量盐渍土的溶陷量要明显高于低中溶盐含量盐渍土；在含盐量近似的情况下构成粗颗粒盐渍土的骨架颗粒越大，盐渍土的溶陷性越弱；重塑土的压实度在一定程度上会影响室内溶陷系数测试的准确性。
The test of collapsibility coefficient of coarse grained saline soil is limited to the field immersion test. However, the conventional method for measuring the coefficient of collapsibility can not meet the test requirements. Based on this problem, this paper introduced a test method of the residual coefficient of indoor coarse-grained saline soil, which overcomes the shortcomings of the existing method, such as the volume ratio of particles and the influence of boundary conditions. By comparing with the field test data, the factors influencing the sedimentation characteristics of coarse-grained saline soil were analyzed and discussed. The results show that the indoor test device and the test method can test the dissolution coefficient of coarse-grained saline soil more accurately, which can provide effective basis for practical engineering construction. For coarse-grained saline soil, the improvement of the content of soluble salt will enhance its trapability to a certain extent. The cohesion of the dissolved salt will improve the integrity and strength of the coarse-grained saline soil, but under the condition of water immersion, the dissolution capacity of the coarse-grained saline soil is obviously higher than that of the salt-The larger the skeleton particles that make up the coarse granular saline soil, the weaker the solubility of the saline soil. The compaction degree of the remodeling soil will affect the accuracy of the indoor dissolution coefficient test to a certain extent