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胡庭婷

 

（重慶市輕工業(yè)學(xué)校 ，重慶 400709)

摘   要 ：為了提高粉煤灰回填地基極限承載力計(jì)算精度，提出一種粉煤灰回填雙層結(jié)構(gòu)地基建筑極限承載 力計(jì)算方法。采用強(qiáng)夯方法構(gòu)建一個(gè)由上層硬殼層、下層軟弱層組成的雙層地基結(jié)構(gòu)，并對其受力情況進(jìn)行分析；計(jì)算不同埋深的基礎(chǔ)地基承載力系數(shù)，并根據(jù)承載力系數(shù)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(cè)壁下沉摩擦力。結(jié)果表明：地基埋深和寬度比值大于等于 4 時(shí)，地基 極限承載力曲線變化趨于平穩(wěn)；當(dāng)?shù)鼗裆顬?1 . 2 m ,  主應(yīng)力系數(shù)為 0. 5 時(shí)地基承載力為 5. 0 MPa ,  主應(yīng)力系數(shù) 為 1 時(shí)地基承載力為 5. 5 MPa;  在相同主應(yīng)力系數(shù)下會(huì)隨著地基基礎(chǔ)埋深的增長而增加。上述結(jié)果表明該評價(jià)結(jié) 果能夠?yàn)樯蠈咏ㄖ锓€(wěn)定性能提供數(shù)據(jù)支撐。

關(guān)鍵詞：粉煤灰回填地基 ；地基承載力 ；地基回填 ；強(qiáng)夯處理 ；應(yīng)力系數(shù) ；極限承載力

中圖分類號：TU473            

文獻(xiàn)標(biāo)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(xiàng)目：重慶市自然科學(xué)基金創(chuàng)新群體科學(xué)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(xué)綜合研究。 

收稿日期：2023- 03- 14