【摘要】：為了更真實(shí)地模擬地下煤巖體所處的三向不等主應(yīng)力狀態(tài),同時(shí)揭示真三軸流固耦合條件下煤巖的力學(xué)特性與流體在其中的滲流規(guī)律,自行研制多功能真三軸流固耦合試驗(yàn)系統(tǒng),該系統(tǒng)主要由框架式機(jī)架、真三軸壓力室、加載系統(tǒng)、內(nèi)密封滲流系統(tǒng)、控制和數(shù)據(jù)測(cè)量、采集系統(tǒng)及聲發(fā)射監(jiān)測(cè)系統(tǒng)組成。該系統(tǒng)的先進(jìn)性和創(chuàng)新性如下:(1)可實(shí)現(xiàn)多種復(fù)雜應(yīng)力路徑下單軸、雙軸、真三軸應(yīng)力狀態(tài)下煤巖力學(xué)特性與流體滲流規(guī)律研究;(2)為了實(shí)現(xiàn)多軸聯(lián)動(dòng)保證試件中心點(diǎn)不變,設(shè)計(jì)3種新的加卸載控制方式(追蹤力Trace-F、追蹤位移Trace-D、追蹤位移修正Trace-Df);(3)特殊設(shè)計(jì)的內(nèi)密封滲流系統(tǒng)配合伺服增壓系統(tǒng),首次實(shí)現(xiàn)了真三軸應(yīng)力條件下氣液的自由滲流控制與監(jiān)測(cè);(4)試驗(yàn)系統(tǒng)采取兩向剛性+一向柔性或剛性加載方式,盡量減小了端部摩擦效應(yīng)的影響,同時(shí)整個(gè)加載系統(tǒng)動(dòng)態(tài)控制,頻率高,輸入信號(hào)多樣,可完成多種特殊試驗(yàn);(5)特殊設(shè)計(jì)了一種多功能加卸載壓頭,可完成真三軸應(yīng)力條件下的水力壓裂試驗(yàn);(6)試驗(yàn)系統(tǒng)可在2個(gè)方向分別提供6 000 k N,1個(gè)方向提供4 000k N的載荷,同時(shí)通過(guò)伺服增壓系統(tǒng),最大可提供60 MPa的流體壓力。利用一系列測(cè)試方法和試驗(yàn)對(duì)該系統(tǒng)的準(zhǔn)確性和可靠性進(jìn)行驗(yàn)證,結(jié)果表明試驗(yàn)系統(tǒng)準(zhǔn)確可靠。該試驗(yàn)系統(tǒng)的研制為研究真三軸流固耦合條件下煤巖的力學(xué)特性與流體滲流規(guī)律提供新手段,可推進(jìn)二氧化碳地質(zhì)儲(chǔ)存、油氣高效開(kāi)采和深部巖土工程等問(wèn)題的深入研究。
[Abstract]:In order to simulate the three direction unequal principal stress state of underground coal and rock mass more realistically, and to reveal the mechanical characteristics of coal and rock and the seepage law of fluid in it under the condition of true triaxial fluid-solid coupling, A multifunctional true triaxial fluid-solid coupling test system is developed. The system consists of frame, true triaxial pressure chamber, loading system, internal sealing seepage system, control and data measurement, acquisition system and acoustic emission monitoring system. The advanced nature and innovation of the system are as follows: (1) it can realize the study of mechanical characteristics of coal and rock and fluid seepage law under the condition of multiple complex stress paths, biaxial and true triaxial stress; (2) in order to realize multiaxial linkage, the center point of the specimen can be kept unchanged. Three new loading and unloading control methods (tracking force Trace-F, tracking displacement Trace-D, tracking displacement correction Trace-Df); (3) are designed for internal seal seepage system combined with servo pressurization system. The control and monitoring of gas-liquid free seepage under true triaxial stress are realized for the first time. (4) the test system adopts a two-direction rigid flexible or rigid loading mode, which minimizes the effect of the end friction effect and the dynamic control of the whole loading system. The frequency is high, the input signal is various, and many special tests can be completed. (5) A multi-function loading and unloading pressure head is specially designed. The hydraulic fracturing test under true triaxial stress condition can be completed. (6) the test system can provide 6 000 KN load in two directions and 4 000 KN load in one direction. At the same time, the maximum fluid pressure of 60 MPa can be provided by the servo pressurization system. The accuracy and reliability of the system are verified by a series of test methods and tests. The results show that the test system is accurate and reliable. The development of the test system provides a new means for studying the mechanical characteristics and fluid seepage law of coal and rock under the condition of true triaxial fluid-solid coupling, and can promote the further research on the geological storage of carbon dioxide, the efficient exploitation of oil and gas, and the deep geotechnical engineering.
【作者單位】： 重慶大學(xué)煤礦災(zāi)害動(dòng)力學(xué)與控制國(guó)家重點(diǎn)實(shí)驗(yàn)室;重慶大學(xué)資源及環(huán)境科學(xué)學(xué)院;重慶大學(xué)復(fù)雜煤氣層瓦斯抽采國(guó)家地方聯(lián)合工程實(shí)驗(yàn)室;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)項(xiàng)目(2011CB201203) 國(guó)家自然科學(xué)基金資助項(xiàng)目(51434003,51374256)~~
【分類號(hào)】：TU45

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