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陳劍鋒 ，徐保林 ，鐘   佩 ，班明才 ，朱雙云

 

（中南勘察基礎工程有限公司 ，武漢 430081)

摘   要：為探討砂巖夾雜膨脹泥巖互層結構變形規律及對路基的影響，對平層 、斜層 、豎層三種重塑砂巖與泥巖膨脹巖互層產狀結構在不同層厚比、不同上覆荷載進行了室內模型試驗和有限元模擬分析。結果表明：產狀 、層厚比和上覆荷載對于互層結構膨脹巖變形的影響均較大，層厚比和上覆荷載越大，變形量越小，平層產狀影響最大，豎層產狀影響最小，斜層產狀影響居中；當互層結構膨脹力大于上覆荷載時，巖樣處于膨脹變形， 當互層結構膨脹力小于上覆荷載時 ，巖樣處于壓縮變形；平層產狀在 1 ∶1、2 ∶1 層厚比時，膨脹力介于 12. 5 ~ 25 kPa 之間，其余情況均小于 12. 5 kPa;  在最不利工況下 ，平層、斜層 、豎層三種互層結構對路基膨脹變形的影響長度  分別為 60 、30 、20 m。

關鍵詞：砂巖 ；膨脹泥巖 ；層厚比 ；產狀 ；上覆荷載 ；膨脹力 ；膨脹變形

中圖分類號：U213 . 1           

文獻標志碼：A            

文章編號： 1005- 8249  (2025)  01- 0055- 05 

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .01 .011

 

CHEN Jianfeng ,  XU Baolin ,  ZHONG Pei ,  BAN Mingcai ,  ZHU Shuangyun   

(Zhongnan Survey Foundation Engineering Co. ，Ltd. ，Wuhan 430081 ,   China)

Abstract：In order to explore the deformation law of sandstone interbedded with expansive mudstone and its influence on roadbed, indoor model tests and finite element simulation analysis were conducted on the interbedded structure of reshaped sandstone and expansive mudstone in three different layers: flat layer, inclined layer, and vertical layer, under different layer thickness ratios and overlying loads. The results show that the attitude, layer thickness ratio, and overlying load have a significant impact on the deformation of interlayer structured expansive rocks. The larger the layer thickness ratio and overlying load, the smaller the deformation. The influence of the flat layer attitude is the greatest, the vertical layer attitude is the smallest, and the inclined layer attitude is in the middle; When the expansion force of the interlayer structure is greater than the overlying load, the rock sample is in expansion deformation. When the expansion force of the interlayer structure is less than the overlying load, the rock sample is in compression deformation; When the layer thickness ratio is 1:1 or 2:1, the expansion force ranges from 12.5 to 25 kPa, while in other cases it is less than 12.5 kPa; Under the most unfavorable working conditions, the lengths of the influence of the three layered structures of flat, inclined, and vertical layers on the expansion deformation of the roadbed are 60 m, 30 m, and 20 m, respectively.

Key words：sandstone; Expansive mudstone; Layer thickness ratio; Attitude; Overburden load; Expansion force; Expansion 

作者簡介： 陳劍鋒  (1978—) , 男，本科，高級工程師，研究方向：巖土工程檢測 、監測 、工程物探等。

收稿日期：2024 - 03 - 28