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水库运行期水库岸坡防洪限制水位及正常蓄水位之间消落带内的岩石,由于库水位的周期性变化而处在湿干交替作用的环境中.针对目前在研究水库运行期岸坡消落带软岩崩解机理过程中消落带湿干交替作用环境模拟不合理的问题,选取三峡库区三叠系巴东组中风化紫红色泥岩为研究对象,将泥岩置于室内周期性湿干交替作用的环境中,对湿化和干燥过程中泥岩崩解物的宏观质量、物质组成及微细观结构和湿化溶液的化学成分的变化进行测试.测试结果表明:崩解物的质量在湿干交替作用5个周期后不再增加;随着湿干交替作用次数的增加,黏土矿物中含量较大的蒙皂石矿物的含量在减少,第1次湿干交替作用后减少最为明显,4次后趋于稳定;随着湿干交替作用次数的增加,阳离子交换量在5个周期后变化很小.根据测试结果,确定了水库运行期消落带三叠系巴东组中风化紫红色泥岩在湿干交替作用过程中的湿化和干燥的模拟时间,即一个湿干交替作用周期的湿化时间为4天、干燥为2天;泥岩在湿干交替作用5个周期后不再崩解.研究成果为揭示水库岸坡消落带软岩崩解机理提供了消落带湿干交替作用环境的合理模拟方式.
The rock in the ebb and flow belt between the reservoir bank flood control limit and the normal water level is in the wet-dry alternation environment due to the periodic change of reservoir water level. In order to solve the problem of unreasonable wet environment and dry-wetting alternation in the ebb and belt, a study was made on the mid-Paleozoic mudstone in the Triassic Badong Formation in the Three Gorges reservoir area. The mudstone was placed in an indoor periodic Wet-dry alternation environment, the macroscopic quality of mudstone disintegration material, the change of the chemical composition of the microstructure and the wetting solution during the wetting and drying process were tested.The results showed that the quality of the disintegration material The wet-dry alternation no longer increases after 5 cycles. With the increase of wet-dry alternation times, the content of smectite minerals with larger content in clay minerals decreases, the most obvious after the first wet-dry alternation , And then became stable after 4 times. With the increase of wet-dry alternation times, the amount of cation exchange changed little after 5 cycles.According to the test results, The time of wet and dry simulation of magenta mudstone during the wet-dry alternation process, ie, the wetting and drying time of alternating wet and dry cycles is 4 days and dry for 2 days; the mudstone is wet and dry after alternating 5 cycles And then disintegration.The research results provide a reasonable simulation method for revealing the disintegration mechanism of soft rock in the fluctuating zone of the bank slope with wet-dry alternating environment.