楊波



摘 要:粉質黏土在我國各個地區均有不同程度的分布,其中西北地區分布尤其廣泛。由于粉質黏土特殊的構成與化學成分,整體軟化程度較高,若遇到較大降水,極易發生坍塌事故。因此,加強對粉質黏土的穩定性研究顯得十分重要。本文借鑒剛體的極限平衡理論相關方法,對我國北部地區的粉質黏土邊坡穩定性進行分析,同時運用FLAC 3D的數值模擬方法,在暴雨情景下進行仿真分析。研究表明,一般情況下,粉質黏土的穩定性較高;但在暴雨情景下,尤其是長時間遭受水流沖擊時,黏土的抗剪能力減弱,邊坡穩定性明顯下降,滑坡風險明顯上升。最后針對這類問題提出了整改措施。
關鍵詞:粉質黏土;穩定性分析;極限平衡法;加固方法
中圖分類號:TU43文獻標識碼:A文章編號:1003-5168(2021)31-0110-03
Stability Analysis and Treatment Technology Research of Silty Clay Slope
YANG Bo
(Zhejiang Huadong Construction Engineering Co., Ltd., Hangzhou Zhejiang 310000)
Abstract: Silty clay is widely distributed in my country, with varying degrees of distribution in various regions, especially in Northwest China. Due to the special composition and chemical composition of silty clay, the overall softening degree is relatively high. If it encounters heavy rainfall , IT is very prone to collapse accidents, so it is very important to study the stability of silty clay. This paper draws on the relevant methods of the limit equilibrium theory of rigid bodies to analyze the stability of silty cohesive slopes in northern my country, and at the same time uses FLAC3D numerical simulation methods to perform simulation analysis under heavy rain scenarios. Studies have shown that under normal circumstances, the stability of silty clay is relatively high. However, under heavy rain scenarios, especially after prolonged exposure to water currents, the shear resistance of the clay is weakened, the stability of the slope is significantly reduced, and the risk of landslides is significantly increased. In response to such problems, rectification measures have been proposed.
Keywords: silty clay;stability analysis;limit equilibrium method;reinforcement method
黏土的穩定性分析是工程安全的一個重要研究課題,其中邊坡問題尤為重要,其穩定程度對工程安全有著至關重要的影響[1-2]。地質災害尤其是山體滑坡對我國經濟發展具有巨大影響,同時也嚴重威脅人民群眾的生命安全,是工程部門重點防治的問題之一。因此,邊坡的穩定性問題引起學術界的廣泛關注[3-5]。
根據國家勘測局的權威認定,粉質黏土的主要成分有蒙脫石、伊利石和黏土礦物等,裂隙發育較為明顯,在干燥的氣候中表現為堅硬質地。一旦遇到強降雨天氣,由于其特殊的化學成分,極易軟化解體,因此在季風帶季候地區,極易發生滑坡災害現象,存在巨大的安全隱患[6]。……