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高   靜 ，張   起

（ 河南省地質(zhì)礦產(chǎn)勘查開發(fā)局第三地質(zhì)礦產(chǎn)調(diào)查院 ，河南 鄭州 450000)

摘   要：以某地水庫大壩基坑巖土為研究對象，進(jìn)行壩坡基坑巖土非線性壓力破壞下應(yīng)力敏感性試驗(yàn)研究。基于巖土滲透率和滲透系數(shù)指標(biāo)，利用非線性破壞規(guī)則分析壩坡基坑巖土的應(yīng)力敏感性。結(jié)果表明：巖土非線性參數(shù)對壩坡基坑地基承載力影響較大， 隨著巖土曲率系數(shù)增大，承載力系數(shù)逐步降低，其中重度影響系數(shù)對巖土極限承載力的影響不敏感；滲透率與孔隙流體內(nèi)壓成正比，且圍壓較大時(shí)巖土滲透率受內(nèi)壓影響變化較小，應(yīng)力不敏感，相反， 圍壓較小時(shí)巖土應(yīng)力敏感性較強(qiáng)；在圍壓不同階段，滲透系數(shù)對含石率變化的敏感系數(shù)曲線，隨著含石率的增加呈現(xiàn)先降低后上升再下降的總體態(tài)勢，含石率為 60% 時(shí)，巖土滲透系數(shù)對含石率變化敏感性最高，應(yīng)力敏感性最高。

關(guān)鍵詞：壩坡基坑巖土；非線性壓力；敏感系數(shù)；應(yīng)力敏感性；圍壓測試；滲透率

中圖分類號：TU45            

文獻(xiàn)標(biāo)志碼：A           

文章編號： 1005- 8249   (2024)  05- 0076- 05 

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.05 .014

 

GAO Jing ,  ZHANG Qi

(The Third Geological and Mineral Investigation Institute of Henan Bureau of Geology

and Mineral Exploration and Development ,  Zhengzhou 450000 ,  China)

Abstract: Taking the rock and soil of a reservoir dam foundation pit as the research object, a stress sensitivity test was conducted on the rock and soil of the dam slope foundation pit under nonlinear pressure failure. Based on the indicators of rock and soil permeability and permeability coefficient, the stress sensitivity of the rock and soil in the dam slope foundation pit is analyzed using nonlinear failure rules. The results show that the nonlinear parameters of rock and soil have a significant impact on the bearing capacity of the foundation pit of the dam slope. As the curvature coefficient of the rock and soil increases, the bearing capacity coefficient gradually decreases. Among them, the severe influence coefficient is not sensitive to the ultimate bearing capacity of the rock and soil; The permeability is directly proportional to the internal pressure of the pore fluid, and when the confining pressure is high, the permeability of the rock and soil is less affected by the internal pressure and less sensitive to stress. On the contrary, when the confining pressure is low, the stress sensitivity of the rock and soil is stronger; At different stages of confining pressure, the sensitivity curve of permeability coefficient to changes in rock content shows an overall trend of first decreasing, then increasing, and then decreasing with the increase of rock content. When the rock content is 60%, the sensitivity of rock and soil permeability coefficient to changes in rock content is the highest, and the stress sensitivity is the highest.

Keywords:rock and soil of dam slope foundation pit; non linear pressure;confining pressure test;pressure bearing sensitivity;sensitivity coefficient;permeability 

 

作者簡介： 高   靜(1982—), 女，本科，工程師，研究方向：水工環(huán)地質(zhì)等相關(guān)專業(yè)的應(yīng)用。

收稿日期：2023-11-15