侯珍珠

摘要：老林場(chǎng)安置點(diǎn)邊坡位于處于重慶市巫山縣，巫山縣城內(nèi)移民安置居民點(diǎn)的建設(shè)形成了一系列的高邊坡，給城鎮(zhèn)居民生命財(cái)產(chǎn)安全帶來較大的威脅。針對(duì)老林場(chǎng)老林場(chǎng)安置點(diǎn)邊坡進(jìn)行穩(wěn)定性分析計(jì)算，發(fā)現(xiàn)邊坡穩(wěn)定現(xiàn)狀為：土質(zhì)（填土）邊坡在各個(gè)剖面上土體整體破壞模式——天然狀態(tài)下處于穩(wěn)定&基本穩(wěn)定但安全儲(chǔ)備不足。飽和狀態(tài)下處于極限平衡狀態(tài)&不穩(wěn)定狀態(tài)，易在降雨作用下的解體、崩塌，并形成整體滑移破壞。巖質(zhì)邊坡整體處于穩(wěn)定狀態(tài)。結(jié)合極限平衡法及工程類比等分析手段，確定滑坡穩(wěn)定性計(jì)算的物理力學(xué)參數(shù);提出以抗滑樁加樁間擋土板為主的治理措施，對(duì)類似工程具有一定的參考價(jià)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(guān)鍵詞：巫山縣;邊坡穩(wěn)定性;工程治理

Key words： Wushan county;slope stability;control project

中圖分類號(hào)：U213.1+58 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?文獻(xiàn)標(biāo)識(shí)碼：A ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?文章編號(hào)：1006-4311（2019）20-0181-04

0 ?引言

老林場(chǎng)安置點(diǎn)邊坡頗高，結(jié)構(gòu)松散，穩(wěn)定性差，易于坍滑，對(duì)老林場(chǎng)移民安置區(qū)威脅極大。危害對(duì)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(shè)施。對(duì)該邊坡進(jìn)行工程防護(hù)迫在眉睫。

1 ?工程地質(zhì)條件與特征

巫山縣老林場(chǎng)處于長(zhǎng)江三峽中的巫峽入口上游附近的長(zhǎng)江北岸，區(qū)域地貌屬于中、淺切割褶皺侵蝕、剝蝕中低山。斜坡區(qū)位于長(zhǎng)江北岸、大寧河?xùn)|岸的山地斜坡地帶，屬于河谷岸坡地貌。場(chǎng)區(qū)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(tài)特征

巫山縣老林場(chǎng)安置點(diǎn)邊坡原為自然邊坡，后由于移民安置建設(shè)分層碾壓填筑形成高邊坡，現(xiàn)坡型由臨時(shí)便道243m平臺(tái)、243m平臺(tái)上側(cè)邊坡以及243m平臺(tái)至龍江大道內(nèi)側(cè)邊坡三部分組成。臨時(shí)便道243m平臺(tái)長(zhǎng)約157m，寬約45m，面積約7065m2;243m上側(cè)邊坡坡度約為27°，坡向76°，坡長(zhǎng)約33m;243m平臺(tái)至龍江大道內(nèi)側(cè)邊坡坡度約22°，坡向76°坡長(zhǎng)約65m。回填土厚度約44m，為起伏不平的回填土邊坡。邊坡總面積約27700m。