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胡庭婷

 

（重慶市輕工業學校 ，重慶 400709)

摘   要 ：為了提高粉煤灰回填地基極限承載力計算精度，提出一種粉煤灰回填雙層結構地基建筑極限承載 力計算方法。采用強夯方法構建一個由上層硬殼層、下層軟弱層組成的雙層地基結構，并對其受力情況進行分析；計算不同埋深的基礎地基承載力系數，并根據承載力系數確定軟弱下層整體剪切破壞承載力、上層地基硬殼層沖剪破壞承載力以及地基土與地基側壁下沉摩擦力。結果表明：地基埋深和寬度比值大于等于 4 時，地基 極限承載力曲線變化趨于平穩；當地基埋深為 1 . 2 m ,  主應力系數為 0. 5 時地基承載力為 5. 0 MPa ,  主應力系數 為 1 時地基承載力為 5. 5 MPa;  在相同主應力系數下會隨著地基基礎埋深的增長而增加。上述結果表明該評價結 果能夠為上層建筑物穩定性能提供數據支撐。

關鍵詞：粉煤灰回填地基 ；地基承載力 ；地基回填 ；強夯處理 ；應力系數 ；極限承載力

中圖分類號：TU473            

文獻標志碼：A           

文章編號： 1005- 8249   (2024)  06- 0054- 05 

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.06.010

 

HU Tingting

(Chong Qing Light Industry School ,  Chongqing 400709 ,  China)

Abstract:In order to improve the accuracy of calculating the ultimate bearing capacity of fly ash backfilled foundation and enhance the stability of buildings, this paper proposes a method for calculating the ultimate bearing capacity of double-layer structure foundation buildings with fly ash backfill. Construct a double-layer foundation structure consisting of an upper hard shell layer and a lower weak layer using dynamic compaction method, and analyze its stress situation; Calculate the bearing capacity coefficient of the foundation at different burial depths, and determine the overall shear failure bearing capacity of the weak lower layer, the impact shear failure bearing capacity of the hard shell layer of the upper foundation, and the settlement friction force between the foundation soil and the foundation sidewall based on the bearing capacity coefficient. The results show that when the ratio of foundation depth to width is greater than or equal to 4, the variation of the ultimate bearing capacity curve of the foundation tends to be stable; The local foundation has a burial depth of 1.2 meters. When the principal stress coefficient is 0.5, the bearing capacity of the foundation is 5 MPa, and when the principal stress coefficient is 1, the bearing capacity of the foundation is 5.5 MPa; Under the same principal stress coefficient, it will increase with the increase of the burial depth of the foundation. The above results indicate that the evaluation results can provide data support for the stability performance of upper level buildings.

Keywords :  fly ash backfill foundation;  foundation bearing capacity;  foundation backfilling;  dynamic  compaction  treatment; stress coefficient;  ultimate  bearing capacity

 

*基金項目：重慶市自然科學基金創新群體科學基金  ( cstc2022jcyj- cxttX0004) 。

作者簡介： 胡庭婷  (1984—) ,  女 ，碩士 ，高級講師 ，研究方向：建筑工程算法研究和教育教學綜合研究。 

收稿日期：2023- 03- 14