發(fā)布時間：2018-12-27 14:31

【摘要】：不少山區(qū)輸電線路的鐵塔基礎(chǔ)都建在斜坡上,研究斜坡地基內(nèi)附加應(yīng)力的分布規(guī)律很有必要。采用室內(nèi)模型試驗和數(shù)值模擬相結(jié)合的方法,研究了臨坡距對斜坡地基附加應(yīng)力分布及擴散規(guī)律的影響。研究成果表明,當臨坡距小于安全距離時,地基附加應(yīng)力隨臨坡距的增大而增大,并在基礎(chǔ)兩側(cè)具有顯著的非對稱性;當臨坡距超過安全距離時,附加應(yīng)力逐漸趨于穩(wěn)定,基本接近平面地基狀態(tài)。傳統(tǒng)的平面地基附加應(yīng)力計算方法不適用于斜坡地基,當臨坡距在0.3 m時,地基淺層附加應(yīng)力接近平面地基條件的50%,說明斜坡對地基附加應(yīng)力的影響十分顯著。在小臨坡距條件下地基附加應(yīng)力較小,但對應(yīng)的地基變形卻較大,也說明傳統(tǒng)的分層總和法不適于計算斜坡地基變形,否則將影響工程安全。在地基穩(wěn)定性滿足要求的前提下,建議最小臨坡距不小于安全距離。
[Abstract]:The tower foundation of many mountain transmission lines is built on the slope, so it is necessary to study the distribution of additional stress in the slope foundation. The influence of slope spacing on the distribution and diffusion of additional stress in slope foundation is studied by using the method of indoor model test and numerical simulation. The results show that the additional stress increases with the increase of the adjoining distance and has significant asymmetry on both sides of the foundation when the distance is less than the safe distance. When the distance between the slope and the slope exceeds the safe distance, the additional stress tends to be stable and is close to the state of the plane foundation. The traditional method for calculating the additional stress of the plane foundation is not suitable for the slope foundation. When the adjacent slope distance is 0.3 m, the additional stress in the shallow layer of the foundation is close to 50% of the condition of the plane foundation, which shows that the slope has a very significant effect on the additional stress of the foundation. Under the condition of small slope distance, the additional stress of the foundation is small, but the corresponding deformation of the foundation is larger. It also shows that the traditional method of stratified summation is not suitable for calculating the deformation of the slope foundation, otherwise, it will affect the safety of the project. On the premise that the stability of foundation meets the requirement, it is suggested that the minimum distance of temporary slope is not less than the safe distance.
【作者單位】： 中國科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國家重點實驗室;
【分類號】：TU470

【參考文獻】

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