本文選題：頁巖 + 各向異性　； 參考：《鉆采工藝》2017年02期

【摘要】：為了研究層狀頁巖各向異性力學特性為工程應用提供依據(jù),開展了頁巖巴西劈裂試驗和單軸、三軸壓縮試驗。研究結果表明,隨著層理角度增加,層狀頁巖縱橫波速均逐漸降低;頁巖抗拉強度隨著層理角度增加先降低后升高呈現(xiàn)出U型變化規(guī)律;θ=0°和θ=90°時頁巖圓盤以直線形裂縫破壞為主,θ=45°時以曲線形裂縫為主;單軸壓縮時應力-應變曲線為Ⅱ類曲線;θ=0°時為沿層理的拉伸劈裂破壞,θ=45°時以剪切滑移破壞為主,θ=90°時主要為剪切破壞;同一圍壓下隨著層理角度升高,彈性模量仍逐漸降低,抗壓強度仍呈現(xiàn)U型變化規(guī)律,泊松比變化較為離散;θ=0°時為共軛剪切破壞,θ=45°時主要為剪切滑移破壞,θ=90°時為貫穿層理的宏觀剪切破裂面;彈性模量、泊松比各向異性指數(shù)隨著圍壓增加呈升高趨勢,抗壓強度各向異性指數(shù)隨著圍壓升高而降低。通過試驗得到頁巖5個獨立彈性參數(shù)可為深入分析頁巖地層的井壁穩(wěn)定性、地應力及水力壓裂等提供技術參考。
[Abstract]:In order to study the anisotropic mechanical properties of layered shale for engineering application, the Brazilian fracturing test and uniaxial and triaxial compression tests were carried out. The results show that the longitudinal and transverse wave velocities of layered shale decrease gradually with the increase of bedding angle. With the increase of bedding angle, the tensile strength of shale decreases first and then increases with the increase of bedding angle, and then increases with the increase of bedding angle, and the fracture failure of shale disc is mainly linear at 胃 0 擄and 胃 0 擄and 90 擄, and the curve fracture is dominant at 45 擄胃. Under uniaxial compression, the stress-strain curve is a class 鈪，

本文編號：2051293