巫山縣老林場安置點邊坡穩定性及工程治理

侯珍珠

摘要：老林場安置點邊坡位于處于重慶市巫山縣，巫山縣城內移民安置居民點的建設形成了一系列的高邊坡，給城鎮居民生命財產安全帶來較大的威脅。針對老林場老林場安置點邊坡進行穩定性分析計算，發現邊坡穩定現狀為：土質（填土）邊坡在各個剖面上土體整體破壞模式——天然狀態下處于穩定&基本穩定但安全儲備不足。飽和狀態下處于極限平衡狀態&不穩定狀態，易在降雨作用下的解體、崩塌，并形成整體滑移破壞。巖質邊坡整體處于穩定狀態。結合極限平衡法及工程類比等分析手段，確定滑坡穩定性計算的物理力學參數;提出以抗滑樁加樁間擋土板為主的治理措施，對類似工程具有一定的參考價值。 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

Abstract： The old farm resettlement site side is located in Wushan county， Chongqi province. The construction of resettlement settlements in Wushan county has formed a series of high slopes which threaten the life and property safety of urban residents. Based on the stability analysis and calculation of the slope at the resettlement point of the old forest farm， it is found that the stability of the slope is as follows： the overall failure mode of the soil mass （filled soil） slope on each section -- the soil mass is stable & basically stable in the natural state， but the safety reserve is insufficient. Under the saturated state， it is in the limit equilibrium state & unstable state， which is easy to disintegrate and collapse under the action of rainfall， and form the overall slip failure. The rock slope is in a stable state as a whole. The physical and mechanical parameters of slide stability calculation are determined by means of limit equilibrium method and engineering analogy. This paper puts forward some control measures based on anti-slide pile and soil retaining plate between piles， which is of certain reference value to similar projects.

關鍵詞：巫山縣;邊坡穩定性;工程治理

Key words： Wushan county;slope stability;control project

中圖分類號：U213.1+58 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?文獻標識碼：A ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?文章編號：1006-4311（2019）20-0181-04

0 ?引言

老林場安置點邊坡頗高，結構松散，穩定性差，易于坍滑，對老林場移民安置區威脅極大。危害對象主要為坡上移民建筑房屋面積16000m2、危害人口約500人以及移民市政道路設施。對該邊坡進行工程防護迫在眉睫。

1 ?工程地質條件與特征

巫山縣老林場處于長江三峽中的巫峽入口上游附近的長江北岸，區域地貌屬于中、淺切割褶皺侵蝕、剝蝕中低山。斜坡區位于長江北岸、大寧河東岸的山地斜坡地帶，屬于河谷岸坡地貌。場區斜坡總體西傾，地形坡角約34°。坡頂最大高程約260m，坡腳最低高程約210m，最大高差50m。

1.1 形態特征

巫山縣老林場安置點邊坡原為自然邊坡，后由于移民安置建設分層碾壓填筑形成高邊坡，現坡型由臨時便道243m平臺、243m平臺上側邊坡以及243m平臺至龍江大道內側邊坡三部分組成。臨時便道243m平臺長約157m，寬約45m，面積約7065m2;243m上側邊坡坡度約為27°，坡向76°，坡長約33m;243m平臺至龍江大道內側邊坡坡度約22°，坡向76°坡長約65m?；靥钔梁穸燃s44m，為起伏不平的回填土邊坡。邊坡總面積約27700m。