| 许 泰,曹 强,张 谦,张 卓,陈治荣.西峰区巴家咀水库坝址区岩土体力学特性研究[J].甘肃地质,2026,35(2):51-61 |
| 西峰区巴家咀水库坝址区岩土体力学特性研究 |
| ROCK AND SOIL PHYSICAL AND MECHANICAL PROPERTIES OF BAJIAZUI RESERVOIR DAM SITE AREA IN XIFENG DISTRICT |
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| DOI： |
| 中文关键词: 岩土体 岩土体力学 坝址区 巴家咀水库 西峰区 |
| 英文关键词:rock-soil mass mechanical property dam site Bajiazui reservoir Xifeng District |
| 基金项目:甘肃省青年人才（个人）项目（2026QNGR034）；甘肃省教育厅高校教师创新基金项目（2023B-201）；甘肃省科技计划项目自
然科学基金（24JRRM023）；陇东学院博士科研启动基金资助（XYBYZK2508）。 |
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| 中文摘要: |
| 坝址区的岩土力学特性对大坝安全运行具有关键影响。 本文针对西峰区巴家咀水库坝址区3类基岩和2类土体开展力学试验研究。结果表明：（1）基岩以紫红色砂岩和黄绿色砂岩为主，次为青灰色砂质页岩。前两者属软弱岩体，孔隙率高、容重小，物理特性差异较小；青灰色砂质页岩抗压强度较砂岩提高约40%，透水性显著降低。 （2）强风化作用使两类砂岩吸水率增加，湿抗压强度降低。 其中紫红色砂岩抗风化能力优于黄绿色砂岩。 （3）土体分为岸坡区第四纪黄土和坝址区新近沉积黄土。 岸坡区的马兰黄土（Q3）为粉土，离石黄土（Q2）和午城黄土（Q1）为粉质黏土，均属中塑性土。 各层黄土由新到老含水量和干密度逐渐增加，孔隙比和湿陷系数逐渐减小，黄土垂直方向的渗透系数大于水平方向。（4）坝址区新近沉积黄土为粉质黏土，不同层位土体液限值基本相同，土粒间联结力较好。从上层淤土到坝体一期土体含水率呈较明显下降趋势，孔隙率波动降低。 各层位土体干湿密度、孔隙比的波动区间和均值变化不明显。坝体一期土体相对潮湿，其他层位土体均为饱和。研究结果可为坝体稳定性评价及除险加固工程的处理措施提供科学依据。 |
| 英文摘要: |
| The rock and soil physical mechanical properties of the dam site area are directly related to the reservoir safe operation. In this paper, three bedrock and two soil are taken as the research objects of Bajiazui reservoir dam site area in Xifeng district. The results show that rock composition of the dam site area is mainly purple-red sandstone and yellow-green sandstone, and there is a small amount of gray sandy shale. Among them, purple-red sandstone and yellow-green sandstone are weak rocks with high porosity and small volumetric weight.There are no significant differences in physical and mechanical properties such as particle density, block density,water absorption and saturation rate. The compressive strength and water permeability of green gray sandy shaleare obviously better than those of two types of sandstone. Strong weathering has no obvious effect on the particledensity of purple -red sandstone and yellow -green sandstone, but it increases the water absorption rate and reduces the wet compressive strength of two rocks. Purple-red sandstone has stronger weathering resistance than yellow-green sandstone, and strong weathering has no effect on the wet compressive strength of gray sandy shale. The dam site area soil composition is mainly the general sedimentary loess in the bank slope area and the newly deposited loess. Malan loess （Q3） is silty loam, Lishi loess （Q2） and Wucheng loess （Q1） are silty clay in the bank slope area. The three loess belong to medium plastic soil. The loess from new to old，the water content and dry bulk density gradually increase, and the void ratio and collapsible deformation coefficient gradually decrease, and the permeability coefficient decreases. The newly deposited loess is silty clay. Different soil layers fluid limits are basically the same, and the inter-particle bonding force is good. From the upper oozy soil to the first stage of the dam soil body, the water content shows a significant downward trend, and the porosity shows a fluctuating
downward trend. The fluctuation range and mean value of dry and wet density and void ratio of soil in each layer are not obvious. The first stage of the dam soil body is relatively wet, and the other layers soil is saturated. This study will have important guiding significance for the dam stability evaluation and the similar reinforcement projects treatment measures. |
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