武汉大桥条带东段地区岩溶发育特征
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1.中国地震局地震研究所;2.中国科学院武汉岩土力学研究所

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中图分类号:

P642

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国家自然科学基金面上项目(42074015);湖北省地震局科研业务费(2022HBJJ017)。


Karst Development Characteristics in The Eastern Section of The Wuhan Bridge Belt
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Institute of Seismology,CEA

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    摘要:

    为探究大桥条带东段岩溶发育特点和岩溶顶板厚度规律,总结岩溶裂隙水类型及补给规律,建立考虑注浆量和充填情况因素的岩溶分类模型。通过统计分析和K-means聚类分析等方法研究了研究区岩溶规律。结果表明:存在严重漏水的溶洞占44.44%,轻微漏水~漏水占18.52%,不漏水占37.04%,溶洞填充物处于软塑状态的占36.54%,流塑~软塑状态占26.92%,可塑状态占19.23%,其余状态占17.31%。注浆量与状态系数呈负相关关系,与溶洞高度和顶板厚度呈正相关关系,溶洞高度对注浆量影响最大。小于某溶洞洞高值对数值和溶洞个数呈线性函数关系,小于某顶板厚度概率实测值和顶板厚度满足三次函数关系;溶洞未填充占12.16%,半填充占9.46%,完全填充占78.38%;见洞率25.52%,平均线岩溶率7.69%,平均洞高2.87m,1/3的洞高度小于1.4m,1/2的洞高度小于2.2m,90%的洞高小于5.5m,溶洞以竖向发育为主,单位溶洞高度注浆量为0.88m3;研究区岩溶裂隙水为HCO3-Na·Ca型水体,岩溶裂隙水主要补给来源于孔隙水;采用K-means聚类算法开展评估和分类,将溶洞划分为两类,第一类注浆量平均值为24.50m3,填充物状态系数平均值为0.38,溶洞高度平均值为2.32m;第二类注浆量平均值为2.36m3,填充物状态系数平均值为0.57,溶洞高度平均值为5.98m,轮廓系数为0.84,分类模型该精度较高,该模型可用于解释溶洞空间上的发育等情况。

    Abstract:

    In order to explore the karst development characteristics and the thickness of karst roof in the eastern section of the bridge belt, the water types and recharge rules of karst fissures were summarized, and a karst classification model considering the grouting amount and filling situation was established. Statistical analysis and K-means cluster analysis were used to study the karst law in the study area. The results showed that 44.44% of the karst caves had serious water leakage, 18.52% had slight water leakage~water leakage, 37.04% had no water leakage, 36.54% of the karst cave fillers were in the soft plastic state, 26.92% were in the flow plastic ~ soft plastic state, 19.23% were in the plastic state, and 17.31% were in the other states. The grouting amount was negatively correlated with the state coefficient, and positively correlated with the height of the karst cave and the thickness of the roof, and the height of the karst cave had the greatest influence on the grouting amount. The logarithmic value of the high value of a karst cave is less than that of a karst cave and the number of karst caves, and the measured value of the probability of a certain roof thickness and the thickness of the roof satisfy the cubic function relationship. 12.16% of the caves were unfilled, 9.46% were semi-filled, and 78.38% were fully filled. The cave rate was 25.52%, the average karst rate was 7.69%, the average cave height was 2.87m, 1/3 of the cave height was less than 1.4m, 1/2 of the cave height was less than 2.2m, and 90% of the cave height was less than 5.5m. In the Ca-type water body, the main source of karst fissure water is pore water. The K-means clustering algorithm was used to evaluate and classify the karst caves, and the karst caves were divided into two categories, the average value of the first type of grouting was 24.50m3, the average state coefficient of the filling was 0.38, and the average height of the karst cave was 2.32m, and the average value of the second type of grouting was 2.36m3, the average state coefficient of the filling was 0.57, the average height of the karst cave was 5.98m, and the contour coefficient was 0.84.

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霍玉龙,郑思维,周政,等. 武汉大桥条带东段地区岩溶发育特征[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-09
  • 最后修改日期:2024-05-21
  • 录用日期:2024-05-29
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