The actress filed Wednesday to get a restraining order against James Heerdegen, who she claims started abusing her in December 2019. In her court filing, Christina claims he beat her, spit at her and made pig noises in her face. She says that incident, during which she suffered multiple bruises, convinced her she needed to leave him.

Christina says she told James she wanted a divorce, but that was derailed when the COVID-19 quarantine began in March, and she "found herself trapped in a house with a violent abuser."

In docs, she claims Heerdegen attacked her twice in June, while still in lockdown ... chasing her around the house, trying to prevent her from calling 911 after an argument. He allegedly dragged her by her wrists into their yard and threw her into a fire pit ... leaving her cut and bruised.

During the second attack, she claims he spit on her and threw coffee and a chair at her -- all while their 6-year-old son was watching.

Christina filed several photos with the court, showing injuries she claims to have suffered at Heerdegen's hands.

Christina filed to divorce him after those alleged incidents, and her attorney, Samantha Spector, was in court Wednesday to file the restraining order.

According to those docs, obtained by TMZ, Christina also fears Heerdegen's abuse could turn deadly. During a car ride in late 2019, she claims James "said something that made me think that [he] could kill me. He said the only way he could feel sorry for me is if I were dismembered into small pieces."

Christina says she immediately hid all the knives in the cabin where they were vacationing.

Late Wednesday, the judge granted a domestic violence restraining order ... which requires Heerdegen to stay 100 yards away from Christina and their son, and have no contact with them.

Christina claims Heerdegen leaves the dog leashed to his living room coffee table when he has visitation with their son -- and under the terms of the restraining order he has to stay away from the dog too.

Although he's already moved out, Christina wants a formal court order blocking James from returning.

And, there's this ... Christina is afraid her estranged husband -- who she married in 2013 -- will release private audio and video of her to "humiliate and embarrass" her, or use it to extort her. She wants the court to block him from releasing it, and force him to turn it over.

Heerdegen's attorney, Larry Bakman, tells TMZ they will file for their own restraining order against Christina "detailing her abusive conduct fueled by alcohol and substance abuse. His papers will also include documentation that Ms. Ricci advised law enforcement in December 2019 that there had been no prior incidents of domestic violence between the couple, thereby calling into question her credibility."