肅祁路白泉門滑坡穩定性分析及工程建議

基金項目：甘肅省交通運輸廳科研項目（2022-20）

第一作者簡介：欒紀昊（1990-），男，碩士，工程師。研究方向為公路工程勘察及地質災害。

DOI：10.19981/j.CN23-1581/G3.2024.21.022

摘" 要：G213線肅祁路通過白泉門滑坡前緣，現滑坡變形嚴重，威脅行車安全，該文對滑坡穩定性進行分析，為公路病害資料提供依據。通過對滑坡地貌特征、裂縫分布情況的研究，將滑坡分為前后兩級，根據變形情況分析，滑坡在地震工況下發生失穩滑動的可能性較大。隨后基于定性分析，反算滑面力學指標，并根據規范穩定性系數要求，計算需要設防的最大水平推力為2 983.4 kN/m。基于道路指標及走廊現狀分析道路治理方案，該處無繞避條件，需對滑坡體進行治理，宜采取抗滑及排水相結合的治理方式。

關鍵詞：滑坡；穩定性分析；肅祁路；地形地貌；地層巖性

中圖分類號：TU42" " "文獻標志碼：A" " " " " 文章編號：2095-2945（2024）21-0093-04

Abstract： Suqi Road of Line G213 passes through the leading edge of Baiquanmen landslide. At present the landslide deforms seriously and threatens traffic safety. This paper analyzes the stability of the landslide and provides a basis for highway disease data. Through the study of the geomorphological features and crack distribution of the landslide， the landslide is divided into two stages. According to the analysis of deformation， the landslide is more likely to occur unstable sliding under the earthquake condition. Then， based on the qualitative analysis， the mechanical index of the sliding surface is inversely calculated， and according to the requirement of the stability coefficient of the code， the maximum horizontal thrust that needs to be fortified is 2 983.4 kN/m. Based on the analysis of the road treatment scheme based on the road index and the present situation of the corridor， there is no bypass condition， so the landslide body needs to be treated， and the combination of anti-slide and drainage should be adopted.

Keywords： landslide; stability analysis; Suqi Road; topography and geomorphology; formation lithology

G213線張掖肅南至青海祁連段，是G213干線的重要組成部分，對區域完善區域公路網，促進經濟發展有著重要的現實意義。白泉門滑坡位于G213線張掖肅南至青海祁連段右側，處于隆暢河支流白泉河下游左側，該區域為地質災害易發地帶[1]。受G213線建設擾動及2022年1月地震影響，坡體變形嚴重，坡體裂縫密布，蠕動下挫趨勢明顯，G213路面路面裂縫、變形嚴重，給行車安全帶來了隱患。因此本文對該滑坡進行研究分析，為滑坡治理及道路的改移提供依據。

1" 滑坡主要工程地質條件

1.1" 地形地貌

滑坡處于構造剝蝕中山區，白泉河河谷呈V型，坡體相對高差大，高差為628 m，坡度30～45°。滑坡所在坡體，坡腳突出，壓迫河道，坡體表層多為坡積碎石覆蓋。……