考虑天然地层层间保护影响的深厚覆盖层允许水力坡降研究

doi:10.13722/j.cnki.jrme.2023.0776

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摘要深厚覆盖层地基的层间保护作用显著影响下伏土层的抗渗强度，渗透稳定评价时应考虑这种作用，然而，目前尚无法量化这种作用对允许水力坡降的影响。针对泸定水电站坝基下游典型地基结构(自下而上依次为②–2层，③–1层，④层)，开展一系列单层及三层土体渗透试验，研究表明：上覆土层对下伏被保护土层的层间保护作用存在2种机制。当两者层间系数同时满足保土性和透水性要求时，上覆土层类似于人工设计的反滤层，其与被保护土层间可形成连续水力过渡关系，从而充分发挥被保护土层自身的抗渗能力维持渗透稳定；而当层间系数仅满足保土性要求，而不满足透水性要求时，上覆土层将充分发挥自身抗渗能力保护被保护土层。基于试验成果，量化了上覆土层的层间保护作用对被保护土层允许水力坡降的贡献，并建立可考虑天然地层层间保护影响的覆盖层允许水力坡降建议取值方法。在上覆土层③–1层和④层的层间保护作用下，下伏②–2层的允许水力坡降平均提升1倍；在④层的保护下，下伏③–1层的允许水力坡降平均提升1.3倍。研究成果为泸定水电站坝基异常渗漏处理及安全评价提供了重要支撑，同时也将为其他类似工程渗流安全评价提供借鉴。

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	邱子源1
	张兴杰1
	罗玉龙1
	金伟2
	张丹2
	盛金昌1
	王惠民1

关键词 ：水利工程, 深厚覆盖层, 渗透稳定, 允许水力坡降, 层间保护, 滤层

Abstract：Interlayer protection significantly influences the anti-seepage strength of deep overburden soil，and it should be considered in the evaluation of seepage stability，however this influence can?t be quantified now. Aiming at a typical strata structure of “②–2，③–1，④” in Luding hydropower station，a list of single-layered and three-layered seepage tests were performed to investigate the influence of interlayer protection. The results indicate that there are two different interlayer protection mechanisms between base soil and overlying strata. When the retention ratio meets the needs of filter and drainage，the overlying strata is the same as the artificially designed filter，and a continuous hydraulic transition is formed to give full play to the anti-seepage ability of the base soil. When the retention ratio only meets the need of filter，the overlying strata mainly undertake the pressure to protect the base soil. Based on the experimental results，the influence of interlayer protection on the allowable gradient was quantified，and then a method determining the allowable gradient was established. Under the protection of strata of ③–1 and ④，the allowable gradient of stratum ②–2 can increase to two times as the initial allowable gradient；Under the protection of stratum of ④，the allowable gradient of stratum ③–1 can increase to 2.3 times as the initial value. The results provide important supports for the solution of abnormal leakage and safety evaluation of Luding hydropower station，and they will provide reference for other similar projects.

Key words： hydraulic engineering deep alluvium foundation seepage stability allowable hydraulic gradient interlayer protection filter

引用本文:

邱子源1，张兴杰1，罗玉龙1，金伟2，张丹2，盛金昌1，王惠民1. 考虑天然地层层间保护影响的深厚覆盖层允许水力坡降研究[J]. 岩石力学与工程学报, 2024, 43(4): 1026-1039.
QIU Ziyuan1，ZHANG Xingjie1，LUO Yulong1，JIN Wei2，ZHANG Dan2，SHENG Jinchang1，WANG Huimin1. Study on the influence of interlayer protection on the allowable hydraulic gradient of deep overburden soil#br#. , 2024, 43(4): 1026-1039.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0776 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I4/1026

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