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劉   健

（ 云南南方地勘工程有限公司 ，云南 大理 671000)

摘   要 ：針對變質巖類順層邊坡的失穩(wěn)模式及失穩(wěn)范圍研究 ，對于保障人民生命財產(chǎn)安全是有重要意義和 工程應用價值。以某工業(yè)園區(qū)石化場地擬開挖的變質巖類順層邊坡為研究對象 ，對試驗段邊坡地質環(huán)境 、巖土 特征進行調(diào)查 ，建立邊坡開挖失穩(wěn)室內(nèi)相似試驗模型 ，獲得邊坡失穩(wěn)破裂跡象及其形成機制。結果表明： 以硬 性結構面為主的邊坡 ，節(jié)理發(fā)育可見跡長 3 . 0 ~ 7. 0 m 居多 ，多呈張開狀態(tài) ；邊坡變形破壞模式為坡面侵蝕沖刷和滑移－拉裂 ，其中 ，滑移－拉裂破壞是此類邊坡失穩(wěn)破壞的典型且主要模式 ；當邊坡以緩傾角  (30 °)  開挖邊時 ，在 3 ~ 5 級邊坡失穩(wěn)范圍較大 ，其裂縫張開寬度及向坡體內(nèi)部延伸深度均較大 ，有多級失穩(wěn)風險。研究成果 可為建立科學 、合理的邊坡穩(wěn)定性及失穩(wěn)范圍預測評價方法提供有益支撐。

關鍵詞：變質巖 ；順層邊坡 ；破裂跡象 ；邊坡開挖失穩(wěn)范圍

中圖分類號：U213 . 1 + 3  

文獻標志碼：A   

文章編號： 1005- 8249  (2024)  03- 0091- 06

DOI：10. 19860/j.cnki.issn1005 - 8249.2024.03 .018

 

LIU Jian

(Yunnan Southern Geological Exploration Engineering Co. ，Ltd. ，Dali 671000 ,  China)

Abstract : The study of the instability mode and range of metamorphic rock bedding slopes is of great significance and engineering application value in ensuring the safety of people ′s lives and property. Taking the metamorphic rock bedding slope to be excavated at a petrochemical site in a certain industrial park as the research object , the geological environment and geotechnical characteristics of the experimental section slope were investigated ,  and an indoor similarity test model for slope excavation instability was established to obtain signs of slope instability and fracture and their formation mechanisms. The results show that for slopes with mainly hard structural planes ,  the visible trace length of joint development is mostly 3 . 0 - 7. 0 meters ,  mostly in an open state; The deformation and failure modes of the slope are erosion erosion and sliding tensile cracking on the slope surface;  Among them ,  slip tensile failure is a typical and main mode of instability and failure of such slopes; When the slope is excavated at a gentle inclination angle (30 °) ,  the instability range of the 3 - 5 level slope is large ,  and the crack opening width and depth extending into the interior of the slope are both large , posing a multi- level instability risk. The research results can provide useful support for establishing scientific and reasonable methods for predicting and evaluating slope stability and instability range.

Keywords : metamorphic rocks; bedding slope; signs of rupture; slope excavation instability range

 

 

作者簡介： 劉健  (1985—) ,   男 ，碩士 ，高級工程師 ，研究方向：巖土工程。

收稿日期：2024- 02- 27