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關鍵詞:高原軟土;工程特性;分布特征;物理力學指標;相關性分析
中圖分類號:TU447" " " 文獻標志碼:A" " " " " 文章編號:2095-2945(2024)33-0076-06
Abstract: The engineering characteristics of the regional swampy soft soil in the western Sichuan Plateau wetlands are different from those of the coastal river and lake soft soil. The lack of relevant data has become an important geotechnical engineering problem in highway construction. Taking the soft soil along the Jiuma Expressway as an example, on the basis of clarifying the regional distribution laws of the four types of soft soils, conducting geotechnical test research through exploration and drilling sampling, determining the values of key physical and mechanical parameters of various soft soils, and analyzing the linear correlation of each physical and mechanical strength index and establishing a fitting formula. The research results can provide reference for the physical and mechanical parameters of soft soil in the engineering construction of the Western Sichuan Plateau, and provide a basis for the selection of soft soil foundation treatment methods, and have clear practical engineering significance.
Keywords: plateau soft soil; engineering characteristics; distribution characteristics; physical and mechanical indicators; correlation analysis
久治至馬爾康段高速公路(以下簡稱久馬高速)位于四川省阿壩州,項目穿越近60 km濕地保護區。該區段內廣泛分布著軟土,與常見的濱海相、三角洲相軟土相比,不僅含水率高且富含有機質。同時,項目所在區域為季節性凍土區,區域內地層結構復雜,土體強度與變形特性差異大,地基處理難度加大。
針對軟土地基,國內外大量學者開展了有益研究。Brand等[1]系統總結了各國軟土的工程特性并開展了對比研究;陳曉平等[2]以珠江三角洲的軟土實驗結果為基礎,分析了蠕變特性對軟土地基變形和孔壓消散的量化影響;章定文等[3]總結了連云港海相軟土主要物理力學指標之間的相關關系;劉維正等[4]通過固結壓縮試驗和CPTU原位測試,發現長江漫灘相軟土既有高位結構性;……