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土石坝中的水力劈裂现象一直是影响坝体施工和运行期安全的隐患之一。为研究土体中发生水力劈裂时的机理及其影响因素,利用三轴仪对黏土心墙料进行了一系列的试验。通过试验认为,含水率和干密度以及试验时围压大小对试样的抗水力劈裂能力有一定的影响,土体中的水压楔劈效应对试样的水力劈裂有较大的影响,试样存在初始缺陷减弱了土体的抗水力劈裂能力,其破坏与均质的试样破坏有一定的区别。
Hydraulic fracturing in earth-rock dams has been one of the hidden dangers affecting the construction and operation of the dam. In order to study the mechanism of hydraulic fracturing in soil and its influencing factors, a series of experiments on clay core wall material were carried out by using triaxial apparatus. According to the test, the moisture content and dry density, as well as the confining pressure during the test, have an impact on the ability of hydraulic fracturing of the sample. The hydraulic wedge effect in the sample has a great influence on the hydraulic fracturing of the sample The initial defect of the sample weakens the ability of hydraulic fracturing of the soil, and the difference between the damage and the homogeneous sample destruction is somewhat different.