平整場地上土巖組合地基的穩(wěn)定性問題
張鳳文 王 春
- 摘 要
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張鳳文 （燕山大學(xué)土木系 秦皇島 300072）王 春 （秦皇島市建委 066000）
[提要] 在下伏基巖單向坡度較大的平整場地上巖土地基的震害多為沿下伏基巖面的滑移破壞，并且震害后果嚴(yán)重。這類地基土的抗震穩(wěn)定性的確定尚無很好的辦法，由于土體具有強非線性彈塑性性質(zhì)，如使用一般圓弧法計算，則會過多地估計被動土壓力對土體穩(wěn)定性的有利影響。結(jié)合具體工程實踐，介紹這類地基土的穩(wěn)定分析以及天然地基不滿足穩(wěn)定要求時的解決辦法。
[關(guān)鍵詞] 平整場地 巖土地基 抗震穩(wěn)定性
Under the seismic action, flat ground base, which is composed of soil and weathered rock and one way surface slope of underground weathered rock is great, mostly results in the soil sliding on the surface of the weathered rock and the damage is always disastrous. Because of soil's great nonlinear elastic-plastic property, if general slip surface method is still used in analyzing the stability, the effect of the passive earth pressure of soil would be overestimated. With the help of practical construction, author gives the analysis of the stability of this kind of ground base and the treatment when nature base cannot satisfy the stability.
Keywords: flat ground;base composed of soil; weathered rock;seismic stability
